Photonic crystals are periodic structural materials that have an impact on the propagation properties of photons.Due to their excellent optical,electrical and magnetic properties,their advantages and potential for app...Photonic crystals are periodic structural materials that have an impact on the propagation properties of photons.Due to their excellent optical,electrical and magnetic properties,their advantages and potential for applications in the above areas are gradually emerging.Therefore,an increasing number of researchers have focused on photonic crystals.In this paper,the characteristics of biological photonic crystal structures,such as those found in butterfly wings,sea mouse bristles,peacock feathers,melon jellyfish epidermal cells,and weevil exoskeletons,are described.The preparation methods of photonic crystals are systematically summarized(including the template method,self-assembly technology,electron beam evaporation coating technology,chemical vapor deposition technology,femtosecond laser two-photon technology,spin coating technology,and a variety of technology mixing),and the characteristics,advantages,and disadvantages of the different methods are compared.Furthermore,the development of photonic crystals in the field of sensors,solar cells,filters,and infrared stealth is discussed,demonstrateing the great development potential of photonic crystals.It is concluded that the realization of photonic crystals with high precision,high sensitivity,angle independence,and large-area uniform preparation is a key problem requiring urgent solution.Moreover,photonic crystals have potential development prospects in the fields of equipment stealth,new concept weapons,production,an daily life.展开更多
[Objectives] To establish the quality standard of barberry branches. [Methods] Microscopic identification and thin layer identification were used to qualitatively identify barberry branches. Berberine content was dete...[Objectives] To establish the quality standard of barberry branches. [Methods] Microscopic identification and thin layer identification were used to qualitatively identify barberry branches. Berberine content was determined by HPLC method, and the content of water, total ash, acid insoluble ash and extract was detected according to the method of the Chinese Pharmacopoeia (2020 edition). [Results] The microscopic identification showed that the features were obvious, and stone cells, cork cells, epidermal cells, stomata, fibers and catheter with reticulated pores could be found. Berberine was detected in barberry branches by thin layer chromatography, and the characteristic spots were separated clearly. Moisture, total ash, and acid insoluble ash content shall not exceed 13%, 6%, and 3%, respectively, and extract content shall not be less than 10%. Berberine hydrochloride (C_(20)H_(18)ClNO_(4)) should be calculated in the branches of Berberis wilsonae Hemsley and Berberis aggregata C. K. Schneid., and berberine (C_(20)H_(17)NO_(4)) content should not be less than 0.05%. The linear relationship was good in the range of 0.002-0.240 mg/mL ( R^(2)=0.999 5). The average recovery was 89.63%, and RSD was 5.28%. [Conclusions] The method was simple, accurate and reproducible, and can be used for the quality control of barberry branches.展开更多
Phytoremediation technology is a newly-developed way of soil heavy metal pollution repair with high efficiency and good ecological comprehensive benefit. This paper briefly introduces the soil heavy metal pollution st...Phytoremediation technology is a newly-developed way of soil heavy metal pollution repair with high efficiency and good ecological comprehensive benefit. This paper briefly introduces the soil heavy metal pollution status at home and abroad,and focuses on the analysis of harm,sources and current situation of soil heavy metal pollution at home and abroad as well as mechanism and application of phytoremediation.Finally it discusses the key problems in phytoremediation technology that need to resolve in the future.展开更多
At present,the problem of heavy metal pollution in farmland in southern China is serious. Especially,the cadmium and lead are two heavy metal elements with serious pollution and great harm to human body. This paper re...At present,the problem of heavy metal pollution in farmland in southern China is serious. Especially,the cadmium and lead are two heavy metal elements with serious pollution and great harm to human body. This paper reviewed some common methods and materials used in the control of cadmium and lead pollution in farmland soil. Then,it discussed the problems in the repair of cadmium and lead pollution in farmland soil. It came up with the future research direction,to provide references for remediation of lead and cadmium pollution in farmland soil.展开更多
Selenium is an essential functional element of the human body,and the issue of selenium accompanying heavy metals is receiving much concern.This paper expounded the form of existence of selenium and cadmium in soil an...Selenium is an essential functional element of the human body,and the issue of selenium accompanying heavy metals is receiving much concern.This paper expounded the form of existence of selenium and cadmium in soil and influencing factors of their bioavailability,and further elaborated the interaction between selenium and cadmium.On the basis,it provided references for further studies on the interaction between selenium and cadmium,and provided basis for establishing selenium-enriched barrier technology for crops.展开更多
[Objectives]The purpose of this study was to provide technical support for high-yield cultivation of major crops in Burundi,thereby increasing local farmers'income and promoting sustainable development of agricult...[Objectives]The purpose of this study was to provide technical support for high-yield cultivation of major crops in Burundi,thereby increasing local farmers'income and promoting sustainable development of agriculture in Burundi.[Methods]In the IMBO and MOSO test stations of the Burundi Academy of Agricultural Sciences and the Burundi Fruit and Vegetable Extension and Service Center,soil testing and formulated fertilization test and demonstration was carried out in rice,maize and cabbage.The test set up three treatments,soil testing and formulated fertilization(STFF),local routine fertilization(RF)and non-fertilization(CK)to investigate the effects of soil testing and formulated fertilization on the yield and economic benefit of the crops.[Results]In the plot test,the yield and net economic benefit of rice,maize and cabbage were both highest in the STFF treatment.Compared with those in the RF treatment,the yield of rice,maize and cabbage increased by 19.0%,25.7%and 33.0%,respectively,and the net economic benefit increased by 4292,2837 and 8232 yuan/ha,respectively.In the field test,the yield and net economic benefit of rice,maize and cabbage were also both highest in the STFF treatment.The yield increased by 18.1%,24.3%and 25.9%,respectively,and the net economic benefit increased by 4142,2881 and 8665 yuan/ha,respectively compared with those in the RF treatment.[Conclusions]Soil testing and formulated fertilization not only increased rice,maize and cabbage yield per unit area,but also increased farmers'income in Burundi.It is one of the important technical measures to promote the increase of agricultural production and income in Burundi.展开更多
[Objectives] This study was conducted to explore the differences in soil nutrient contents of cultivated land in different regions of Laos,and to provide a basis for soil nutrient management and scientific fertilizati...[Objectives] This study was conducted to explore the differences in soil nutrient contents of cultivated land in different regions of Laos,and to provide a basis for soil nutrient management and scientific fertilization in Laos. [Methods] By collecting 166 samples of the 0-20 cm cultivated soil layer from farmland in the farming areas of Luang Namtha Province in the northern part of Laos and Vientiane Province in the middle of the country,the contents of soil organic matter,total nitrogen,available phosphorus,available potassium,available calcium and available magnesium were analyzed,so as to evaluate the current status of soil nutrient fertility and explore the differences in soil nutrient contents of regional cultivated land. [Results] The soil organic matter was relatively abundant,the total nitrogen and available potassium contents were at the lower-middle level,and the available phosphorus,available calcium and available magnesium were insufficient or extremely insufficient. The soil nutrient contents of cultivated land were different in different regions. [Conclusions] It is suggested that lime or other alkaline fertilizers should be applied on the farmland with acid soil,and nitrogen,phosphorus,and potassium fertilizers should be added at the same time to improve soil nutrient fertility.展开更多
This paper reviewed the meaning of facility agriculture and the development status and trends of facility agriculture at home and abroad,analyzed the development status and existing problems of facility agriculture in...This paper reviewed the meaning of facility agriculture and the development status and trends of facility agriculture at home and abroad,analyzed the development status and existing problems of facility agriculture in Guangxi,and proposed corresponding solutions to the problems in the development of facility agriculture in Guangxi,aiming to provide reference for promoting the sustainable development of facility agriculture in Guangxi.展开更多
Based on the investigation of 56 soil samples( 0-30 cm) in citrus orchards of Guangxi,the content of soil organic matter and available nutrients as well as their correlations in the citrus orchards were studied. The r...Based on the investigation of 56 soil samples( 0-30 cm) in citrus orchards of Guangxi,the content of soil organic matter and available nutrients as well as their correlations in the citrus orchards were studied. The results showed that soil was rich in organic matter,and the proportion of soil samples deficient in available N,P and K was 30. 36%,32. 14% and 28. 57% respectively. Soil was seriously deficient in soil available Ca,Mg and B,while the content of soil available Fe and Cu in soil was too high. There were significant or extremely significant positive or negative correlations between soil pH,organic matter and several available nutrients. It is recommended to apply Mg fertilizer,B fertilizer,lime or other alkaline fertilizer and reduce the spraying of fungicides containing Cu in the citrus orchards.展开更多
This paper summarizes the research progress and major achievements of the coupling effect of water and fertilizer on grape cultivation in China and abroad in recent years,emphatically analyzes the application status a...This paper summarizes the research progress and major achievements of the coupling effect of water and fertilizer on grape cultivation in China and abroad in recent years,emphatically analyzes the application status and some problems of the coupling effect of water and fertilizer on double-cropping grape cultivation mode in Guangxi Zhuang Autonomous Region,discusses the key problems to be further resolved,and finally makes the relevant recommendations.展开更多
[Objectives]To explore morphological identification,macroscopical identification,microscopic identification,thin layer chromatography(TLC)identification of Tibetan medical material Dracocephalum tanguticum Maxim.,and ...[Objectives]To explore morphological identification,macroscopical identification,microscopic identification,thin layer chromatography(TLC)identification of Tibetan medical material Dracocephalum tanguticum Maxim.,and provide experimental data for its identification and application.[Methods]The Tibetan medical material was identified by means of original plant,characters,powder,paraffin section and thin layer chromatography(TLC).[Results]Tibetan medical material D.tanguticum Maxim.was obviously distinguished in character identification and microscopic identification,and the TLC method was simple and feasible.[Conclusions]The results will provide the source work foundation for the formulation of the quality standard of Sichuan Province(draft)for Tibetan medicinal material"D.tanguticum Maxim."and the development of pharmaceutical preparations for medical institutions.展开更多
[Objectives]This study was conducted to improve the water use efficiency and fruit quality of citrus,and realize the automatic irrigation and standardized production in citrus orchards.[Methods]With Orah as the resear...[Objectives]This study was conducted to improve the water use efficiency and fruit quality of citrus,and realize the automatic irrigation and standardized production in citrus orchards.[Methods]With Orah as the research object,the effects of intelligent irrigation management in citrus orchards on citrus leaf chlorophyll content,photosynthetic characteristics and fruit quality were investigated by comparing with conventional farmer management.[Results]The smart irrigation measure in citrus orchards significantly increased the SPAD value of leaves at the maturation stage of citrus,and simultaneously significantly improved the photosynthetic rate,transpiration rate and stomatal conductance at the flower bud differentiation stage,as well as the photosynthetic rate,transpiration rate,stomatal conductance and intercellular CO_(2) concentration at the maturation stage.However,the effects on the photosynthetic characteristic indexes in the rainy season were not significant.Compared with conventional experience management,the smart irrigation management measure of citrus orchards increased the edible rate and juice rate of citrus by 4.53 and 3.69 percentage points,respectively,and increased soluble solids,total sugar,vitamin C and sugar-acid ratio by 16.75%,20.86%,24.10%and 13.17%,respectively.[Conclusions]The smart irrigation management fully met the water demand for citrus growth due to timely irrigation,significantly improved the photosynthesis indicators of citrus leaves during drought,and significantly improved the quality of citrus.展开更多
[Objectives]To study the characteristics of soil heavy metal contents in facility agriculture of Guangxi and analyze its risks.[Methods]The heavy metal content of 30 surface soil samples taken from facility agricultur...[Objectives]To study the characteristics of soil heavy metal contents in facility agriculture of Guangxi and analyze its risks.[Methods]The heavy metal content of 30 surface soil samples taken from facility agriculture in Guangxi was analyzed.The status of soil heavy metal pollution in facility agriculture of Guangxi was evaluated by the single factor index method,geo-accumulation index method and Hakanson potential ecological risk index method with reference to the soil background value in Guangxi.[Results]Compared with the soil background value in Guangxi,the over-limit rates of heavy metals cadmium,lead,arsenic,chromium,mercury,copper and zinc in soil samples were 56.67%,56.67%,16.67%,30.00%,50.00%,60.00%and 80.00%,respectively.Compared with the screening values of the Soil Environmental Quality-Risk Control Standard for Soil Contamination of Agricultural Land(for trial implementation)(GB15618-2018),the overlimit rates of the heavy metals cadmium,arsenic,copper and zinc in the surface soil of agricultural facilities in Guangxi were 56.67%,10.00%,16.67%and 23.33%,respectively.Except for the average content of soil cadmium exceeding the screening value,the evaluation content of the other six soil heavy metals did not exceed the screening value.According to the evaluation results of the single factor pollution index method,the surface soil arsenic and chromium of the agricultural facilities in Guangxi belonged to the clean level,lead,mercury,and copper belonged to mild pollution,and cadmium and zinc belonged to moderate pollution.According to the evaluation results of the geo-accumulation index,the lead,arsenic,chromium and mercury in the surface soil of the agricultural facilities in Guangxi belonged to the pollution-free level,while the cadmium,copper and zinc belonged to the mild-moderate pollution.According to the evaluation results of the potential ecological risk index method,the potential ecological risks of the heavy metals of lead,arsenic,chromium,copper and zinc in the soil of agricultural facilities in Guangxi belonged to low potential ecological risk level,and the potential ecological risks of cadmium and mercury belonged to moderate risk level.The potential ecological risk index(RI)of the seven heavy metals in the soil was 132.46,which belonged to moderate potential ecological risk.The largest contribution of soil heavy metals to the potential ecological risk index was cadmium and mercury.[Conclusions]Taking the soil of facility agriculture in Guangxi as the object,this paper studied the characteristics of heavy metal content in facility agricultural soil and its risk assessment,in order to provide a scientific basis for facility soil heavy metal risk prevention and control and provide safe technology for facility agriculture.展开更多
Clay minerals,phosphates,alkaline materials,organic materials are common improvers in the management of Cd polluted soil. This paper systematically summarized types of common soil improvers and their passivation mecha...Clay minerals,phosphates,alkaline materials,organic materials are common improvers in the management of Cd polluted soil. This paper systematically summarized types of common soil improvers and their passivation mechanism of Cd in soil. It reviewed advances in researches of soil improvers. Besides,it introduced major problems in four common passivating agents for management of Cd polluted soil. Finally,according to different mechanism characteristics of passivating agents,it came up with some recommendations.展开更多
[Objectives]To explore the nutrient accumulation characteristics of facility soil in different planting years in the lateritic red soil region of Guangxi.[Methods]The soil samples of facility cultivation and open fiel...[Objectives]To explore the nutrient accumulation characteristics of facility soil in different planting years in the lateritic red soil region of Guangxi.[Methods]The soil samples of facility cultivation and open field cultivation were collected in the lateritic red soil region of Guangxi,and the changes of soil pH,water-soluble salts,organic matter,available nutrients and total nutrients were analyzed.[Results]The acidification of the facility soil in the lateritic red soil region of Guangxi became more obvious with the extension of greenhouse planting years,the soil pH decreased by 0.34 units after continuous planting for 10 years,and the water-soluble content was more than 3 times that of the open field and it increased with the extension of the planting years.In addition,the degree of secondary salinization in facility soil became more serious,mainly moderate and mild salinization.The contents of soil organic matter,alkali-hydrolyzed nitrogen,available phosphorus,available potassium,total nitrogen and total phosphorus in the facility soil increased significantly,while total potassium did not change significantly.[Conclusions]This study is expected to provide a scientific basis for facility soil fertilization management,and to promote the sustainable and healthy development of facility cultivation industry.展开更多
[Objectives]The paper was to explore the effects of different mulching methods on soil moisture content and water movement in citrus orchards,and to provide the theoretical basis for improving water and weed managemen...[Objectives]The paper was to explore the effects of different mulching methods on soil moisture content and water movement in citrus orchards,and to provide the theoretical basis for improving water and weed management level in orchards.[Methods]Three ground mulching treatments including spraying herbicide(CK),grass-proof cloth cover(GPC)and natural grass mowing(NGM)were set up to analyze the soil moisture content and water flux characteristics of soil profile in the soil layers of 5,20,40 and 60 cm under different mulching methods.[Results]The GPC and NGM treatments significantly increased the soil moisture content in the soil layer of 0-60 cm at the young fruit stage and fruit expansion stage,which inhibited soil water evaporation and effectively improved soil water holding capacity,thus reducing irrigation water consumption and saving water resources.During the expansion stage of citrus fruits,the soil water flux in the soil layer of 0-60 cm in NGM and CK treatments was upward,and the upward soil water flux in NGM treatment was larger,which could mobilize more upward movement of deep soil moisture for uptake by citrus roots.However,the soil water flux in the soil layer of 0-60 cm in GPC treatment was downward,and the soil moisture conditions in the upper and middle layers were already sufficient for citrus growth.[Conclusions]Both GPC and NGM treatments can increase the overall soil moisture content.In the dry season,the soil moisture content in the upper layer treated by GPC is always relatively high,while more soil water in the lower layer move to the upper layer in NGM treatment,which has met the water requirements for citrus growth.展开更多
[Objectives]To study the remediation methods of secondary salinization and cadmium pollution in facility soil.[Methods]Two kinds of soil amendments,potassium fulvic acid and limestone powder,were selected to be applie...[Objectives]To study the remediation methods of secondary salinization and cadmium pollution in facility soil.[Methods]Two kinds of soil amendments,potassium fulvic acid and limestone powder,were selected to be applied alone or combined together to plant maize to carry out field experiments.Their effects on watermelon yield,watermelon cadmium content,soil available nitrogen,phosphorus,potassium and water-soluble salts were studied.[Results]The application of potassium fulvic acid,limestone powder and their combined application increased the yield and soluble solids of watermelon to different degrees.The contents of seven heavy metals including cadmium,copper,zinc,arsenic,lead,mercury and chromium in the watermelon of all treatments were all lower than the food safety limit stipulated in the national standard.During the harvest period of maize seedlings,all treatments could increase soil pH and decrease soil cadmium availability.In particular,3000 kg/ha of limestone powder and 1500 kg/ha of potassium fulvic acid had the best effect on reducing soil available cadmium content.In reducing soil available cadmium content,there were significant differences between single application of amendment and combined application treatments.In addition,compared with the control CK,all treatments decreased soil available nitrogen,phosphorus,potassium and water-soluble salt content.[Conclusions]Potassium fulvic acid,limestone powder and their combined application can increase the yield of watermelon,and can significantly reduce the available cadmium,nitrogen,phosphorus,potassium and water-soluble salt content in the facility soil of maize cultivation.展开更多
[Objectives]To evaluate the status of soil nutrient and fertility in main dry farming regions of Laos,and to explore differences in soil nutrient content between regions and crop types.[Methods]By collecting 57 soil s...[Objectives]To evaluate the status of soil nutrient and fertility in main dry farming regions of Laos,and to explore differences in soil nutrient content between regions and crop types.[Methods]By collecting 57 soil samples in the 0-20 cm layer of the main dryland in southern and northern provinces of Laos.Soil pH,organic matter,total nitrogen,available nitrogen,available phosphorus,available potassium,exchangeable calcium,exchangeable magnesium and available zinc content were analyzed.[Results]The soil in the main dry farming regions of Laos was acidic,the overall fertility level was good,and the exchangeable calcium and magnesium contents were low.There were differences in soil nutrient content in the dry farming regions of southern and northern Laos.Drylands where cassava and maize were growed had higher fertility.[Conclusions]It is suggested to apply lime or alkaline fertilizer in the dry land with acid soil to increase soil pH and increase the supply of soil calcium and magnesium.Organic fertilizer should be applied to improve soil water retention capacity,and it is necessary to pay attention to the fertilization ratio of macroelements to balance fertilization.展开更多
[Objectives]This study aimed to understand and master the nutritional characteristics of‘Jianyang Juyou’growing in southern Guangxi,with a view to providing a theoretical basis for the rational fertilization of loca...[Objectives]This study aimed to understand and master the nutritional characteristics of‘Jianyang Juyou’growing in southern Guangxi,with a view to providing a theoretical basis for the rational fertilization of local orchards.[Methods]The leaves of 3-year-old‘Jianyang Juyou’were sampled according to the phenological characteristics,and the dynamics in the contents of macronutrients and main trace elements N,P,K,Ca,Mg,Fe,Zn and B in the leaves were analyzed.[Results]The average contents of N,P and K in the leaves of‘Jianyang Juyou’were in the order as N>K>P.Among them,the content of N reached the highest during the flowering period and then decreased;K maintained a high content around the fruit enlargement period;the Ca content of leaves is significantly greater than that of Mg,and the peak value of Ca content appeared during the flowering and color change periods;the Mg content increased from the germination stage to the late fruit enlargement stage,while decreased in the color change stage;the average contents of main trace elements in the leaves ranked as Fe>B>Zn;the Fe content gradually increased from the germination stage to the physiological fruit drop stage,and slowly decreased after the fruit enlargement;the Zn content peaked in the physiological fruit drop period and fruit maturity period;and the B content of the leaves was 81.6-87.2 mg/kg during the flowering period,the early period of fruit enlargement,the late period of fruit enlargement,and the color change period.[Conclusions]During the phenological period,the leaves of‘Jianyang Juyou’had a higher demand for N,and the peak absorption period was mainly concentrated from the germination period to the early period of fruit enlargement;the demand for K was second only to N,and the peak absorption period was concentrated in the early stage of fruit enlargement to the mature stage;and the demand for P was minimal.In the production of‘Jianyang Juyou’Mg played an important role in promoting budding and blooming,preserving flowers and fruits and promoting fruit enlargement,so attention should be paid to the application of Mg fertilizer before the color change period.During the flowering period,the early period of fruit enlargement,the late period of fruit enlargement,and the color change period,B fertilizer could be appropriately increased by soil application or foliar spraying.Due to the large fluctuation of Zn content in leaves and small mobility of Zn,it could be supplemented quickly by spraying on the leaf surface before the physiological fruit drop period and fruit maturity period.展开更多
Objective:To rapidly identify the two morphologies and chemical properties of similar herbal medicines,Blumea riparia and B.megacephala as the basis for chemical constituent analysis.Methods:UPLC-Q-Exactive-MS/MS was ...Objective:To rapidly identify the two morphologies and chemical properties of similar herbal medicines,Blumea riparia and B.megacephala as the basis for chemical constituent analysis.Methods:UPLC-Q-Exactive-MS/MS was utilized for profiling and identification of the constituents in B.riparia and B.megacephala.Chemical pattern recognition(CPR)was further used to compare and distinguish the two herbs and to identify their potential characteristic markers.Then,an HPLC method was established for quality evaluation.Results:A total of 93 constituents are identified,including 54 phenolic acids,35 flavonoids,two saccharides,one phenolic acid glycoside,and one other constituent,of which 67 were identified in B.riparia and B.megacephala for the first time.CPR indicates that B.riparia and B.megacephala samples can be distinguished from each other based on the LC–MS data.The isochlorogenic acid A to cryptochlorogenic acid peak area ratio calculated from the HPLC chromatograms was proposed as a differentiation index for distinguishing and quality control of B.riparia and B.megacephala.Conclusion:This study demonstrates significant differences between B.riparia and B.megacephala in terms of chemical composition.The results provide a rapid and simple strategy for the comparison and evaluation of the quality of B.riparia and B.megacephala.展开更多
基金Supported by National Natural Science Foundation of China(Grant Nos.52275227,52130509)Key Basic Research Project of the Foundation Strengthening Plan of China(Grant Nos.2019-JCJQ-JJ-034,2019-JCJQ-ZD-302).
文摘Photonic crystals are periodic structural materials that have an impact on the propagation properties of photons.Due to their excellent optical,electrical and magnetic properties,their advantages and potential for applications in the above areas are gradually emerging.Therefore,an increasing number of researchers have focused on photonic crystals.In this paper,the characteristics of biological photonic crystal structures,such as those found in butterfly wings,sea mouse bristles,peacock feathers,melon jellyfish epidermal cells,and weevil exoskeletons,are described.The preparation methods of photonic crystals are systematically summarized(including the template method,self-assembly technology,electron beam evaporation coating technology,chemical vapor deposition technology,femtosecond laser two-photon technology,spin coating technology,and a variety of technology mixing),and the characteristics,advantages,and disadvantages of the different methods are compared.Furthermore,the development of photonic crystals in the field of sensors,solar cells,filters,and infrared stealth is discussed,demonstrateing the great development potential of photonic crystals.It is concluded that the realization of photonic crystals with high precision,high sensitivity,angle independence,and large-area uniform preparation is a key problem requiring urgent solution.Moreover,photonic crystals have potential development prospects in the fields of equipment stealth,new concept weapons,production,an daily life.
基金Supported by the National Key Research and Development Plan(2018YFC-06101)Sichuan Provincial Natural Science Foundation(2022NSFSC1605)+2 种基金Traditional Chinese Medicine(Ethnic Medicine)Standard Improvement of Sichuan Medical Products Administration(510201202102305)Leading Talents Support Plan of National Ethnic Affairs Commission in 2022Special Project for the University-Level Innovation Team in the Fundamental Research Funds for the Central Universities(ZYN2022067).
文摘[Objectives] To establish the quality standard of barberry branches. [Methods] Microscopic identification and thin layer identification were used to qualitatively identify barberry branches. Berberine content was determined by HPLC method, and the content of water, total ash, acid insoluble ash and extract was detected according to the method of the Chinese Pharmacopoeia (2020 edition). [Results] The microscopic identification showed that the features were obvious, and stone cells, cork cells, epidermal cells, stomata, fibers and catheter with reticulated pores could be found. Berberine was detected in barberry branches by thin layer chromatography, and the characteristic spots were separated clearly. Moisture, total ash, and acid insoluble ash content shall not exceed 13%, 6%, and 3%, respectively, and extract content shall not be less than 10%. Berberine hydrochloride (C_(20)H_(18)ClNO_(4)) should be calculated in the branches of Berberis wilsonae Hemsley and Berberis aggregata C. K. Schneid., and berberine (C_(20)H_(17)NO_(4)) content should not be less than 0.05%. The linear relationship was good in the range of 0.002-0.240 mg/mL ( R^(2)=0.999 5). The average recovery was 89.63%, and RSD was 5.28%. [Conclusions] The method was simple, accurate and reproducible, and can be used for the quality control of barberry branches.
基金Supported by Fundamental Research Funds for the GXAAS(2015JZ292015JZ302015YT32)
文摘Phytoremediation technology is a newly-developed way of soil heavy metal pollution repair with high efficiency and good ecological comprehensive benefit. This paper briefly introduces the soil heavy metal pollution status at home and abroad,and focuses on the analysis of harm,sources and current situation of soil heavy metal pollution at home and abroad as well as mechanism and application of phytoremediation.Finally it discusses the key problems in phytoremediation technology that need to resolve in the future.
基金Supported by National Key Research and Development Program(2016YED0800705-01)Key Research and Development Program of Guangxi(AB16380084+2 种基金AB16380164)Scientific Research and Technological Development Program Project of Nanning City(20162105)Scientific Development Fund Project of Guangxi Academy of Agricultural Sciences(2017JM06)
文摘At present,the problem of heavy metal pollution in farmland in southern China is serious. Especially,the cadmium and lead are two heavy metal elements with serious pollution and great harm to human body. This paper reviewed some common methods and materials used in the control of cadmium and lead pollution in farmland soil. Then,it discussed the problems in the repair of cadmium and lead pollution in farmland soil. It came up with the future research direction,to provide references for remediation of lead and cadmium pollution in farmland soil.
基金Supported by National Key Research and Development Program(2016YED-0800705-01)Key Research and Development Program of Guangxi(Gui Ke AB16380084 and Gui Ke AB16380088)+7 种基金Scientific Research and Technological Development Program Project of Guangxi Province(Gui Ke He 415104001-22)Key Agricultural Science and Technology Program of Guangxi(201528,201604)Selenium-enriched Specialty Crop Experimental Station of Guangxi(Gui TS2016011)Scientific Research and Technological Development Program Project of Nanning City(20162105,0152054-13)Scientific Development Fund Project of Guangxi Academy of Agricultural Sciences(2017JM07)Special Basic Scientific Research Project of Guangxi Academy of Agricultural Sciences(Gui Nong Ke 2017YZ03)Key Research and Development Program of Qingxiu District of Nanning City(2016039)Scientific Research and Technological Development Program of Xixiangtang District of Nanning City(2015312)
文摘Selenium is an essential functional element of the human body,and the issue of selenium accompanying heavy metals is receiving much concern.This paper expounded the form of existence of selenium and cadmium in soil and influencing factors of their bioavailability,and further elaborated the interaction between selenium and cadmium.On the basis,it provided references for further studies on the interaction between selenium and cadmium,and provided basis for establishing selenium-enriched barrier technology for crops.
基金Special Scientific and Technological Assistance Program of Ministry of Science and Technology of the People's Republic of China to Developing Countries(Demonstration and Popularization of Key Technologies for Increasing Grain Yield in Africa)Scientific Research and Technology Development Plan Project of Guangxi Zhuang Autonomous Region,China(Gui Ke He 1346009-4,Gui Ke He 14125007-2-7).
文摘[Objectives]The purpose of this study was to provide technical support for high-yield cultivation of major crops in Burundi,thereby increasing local farmers'income and promoting sustainable development of agriculture in Burundi.[Methods]In the IMBO and MOSO test stations of the Burundi Academy of Agricultural Sciences and the Burundi Fruit and Vegetable Extension and Service Center,soil testing and formulated fertilization test and demonstration was carried out in rice,maize and cabbage.The test set up three treatments,soil testing and formulated fertilization(STFF),local routine fertilization(RF)and non-fertilization(CK)to investigate the effects of soil testing and formulated fertilization on the yield and economic benefit of the crops.[Results]In the plot test,the yield and net economic benefit of rice,maize and cabbage were both highest in the STFF treatment.Compared with those in the RF treatment,the yield of rice,maize and cabbage increased by 19.0%,25.7%and 33.0%,respectively,and the net economic benefit increased by 4292,2837 and 8232 yuan/ha,respectively.In the field test,the yield and net economic benefit of rice,maize and cabbage were also both highest in the STFF treatment.The yield increased by 18.1%,24.3%and 25.9%,respectively,and the net economic benefit increased by 4142,2881 and 8665 yuan/ha,respectively compared with those in the RF treatment.[Conclusions]Soil testing and formulated fertilization not only increased rice,maize and cabbage yield per unit area,but also increased farmers'income in Burundi.It is one of the important technical measures to promote the increase of agricultural production and income in Burundi.
基金Supported by Guangxi R&D Project (Gui Ke-AD17195026)Fund of Guangxi Academy of Agricultural Sciences (2019ZX121)。
文摘[Objectives] This study was conducted to explore the differences in soil nutrient contents of cultivated land in different regions of Laos,and to provide a basis for soil nutrient management and scientific fertilization in Laos. [Methods] By collecting 166 samples of the 0-20 cm cultivated soil layer from farmland in the farming areas of Luang Namtha Province in the northern part of Laos and Vientiane Province in the middle of the country,the contents of soil organic matter,total nitrogen,available phosphorus,available potassium,available calcium and available magnesium were analyzed,so as to evaluate the current status of soil nutrient fertility and explore the differences in soil nutrient contents of regional cultivated land. [Results] The soil organic matter was relatively abundant,the total nitrogen and available potassium contents were at the lower-middle level,and the available phosphorus,available calcium and available magnesium were insufficient or extremely insufficient. The soil nutrient contents of cultivated land were different in different regions. [Conclusions] It is suggested that lime or other alkaline fertilizers should be applied on the farmland with acid soil,and nitrogen,phosphorus,and potassium fertilizers should be added at the same time to improve soil nutrient fertility.
基金Supported by Guangxi Science and Technology Planning Project(GK AB18221096)Fund of Guangxi Academy of Agricultural Sciences(CNK 2015YT322019ZX121).
文摘This paper reviewed the meaning of facility agriculture and the development status and trends of facility agriculture at home and abroad,analyzed the development status and existing problems of facility agriculture in Guangxi,and proposed corresponding solutions to the problems in the development of facility agriculture in Guangxi,aiming to provide reference for promoting the sustainable development of facility agriculture in Guangxi.
基金Supported by Research and Development Project of Yongning District,Nanning City,Guangxi(20170103B)
文摘Based on the investigation of 56 soil samples( 0-30 cm) in citrus orchards of Guangxi,the content of soil organic matter and available nutrients as well as their correlations in the citrus orchards were studied. The results showed that soil was rich in organic matter,and the proportion of soil samples deficient in available N,P and K was 30. 36%,32. 14% and 28. 57% respectively. Soil was seriously deficient in soil available Ca,Mg and B,while the content of soil available Fe and Cu in soil was too high. There were significant or extremely significant positive or negative correlations between soil pH,organic matter and several available nutrients. It is recommended to apply Mg fertilizer,B fertilizer,lime or other alkaline fertilizer and reduce the spraying of fungicides containing Cu in the citrus orchards.
基金Supported by Special Funds for Bagui Scholars Construction ProjectSpecial Research Funds of Guangxi Academy of Agricultural Sciences(2015JZ30)+2 种基金National Key Technology R&D Program(2014BAD16B05)Scientific Research and Technological Development Project in Guangxi(14251007)Team Project of Guangxi Academy of Agricultural Sciences(2015YT82)
文摘This paper summarizes the research progress and major achievements of the coupling effect of water and fertilizer on grape cultivation in China and abroad in recent years,emphatically analyzes the application status and some problems of the coupling effect of water and fertilizer on double-cropping grape cultivation mode in Guangxi Zhuang Autonomous Region,discusses the key problems to be further resolved,and finally makes the relevant recommendations.
基金National Key Research and Development Program(2018YFC1708005)Science and Technology Program of Sichuan Province(2021YFS0043)Special Fund Research Projects of Fundamental Research Funds for the Central Universities(2020NGD01).
文摘[Objectives]To explore morphological identification,macroscopical identification,microscopic identification,thin layer chromatography(TLC)identification of Tibetan medical material Dracocephalum tanguticum Maxim.,and provide experimental data for its identification and application.[Methods]The Tibetan medical material was identified by means of original plant,characters,powder,paraffin section and thin layer chromatography(TLC).[Results]Tibetan medical material D.tanguticum Maxim.was obviously distinguished in character identification and microscopic identification,and the TLC method was simple and feasible.[Conclusions]The results will provide the source work foundation for the formulation of the quality standard of Sichuan Province(draft)for Tibetan medicinal material"D.tanguticum Maxim."and the development of pharmaceutical preparations for medical institutions.
基金Supported by Guangxi Key Research and Development Project(GK AB1850024)。
文摘[Objectives]This study was conducted to improve the water use efficiency and fruit quality of citrus,and realize the automatic irrigation and standardized production in citrus orchards.[Methods]With Orah as the research object,the effects of intelligent irrigation management in citrus orchards on citrus leaf chlorophyll content,photosynthetic characteristics and fruit quality were investigated by comparing with conventional farmer management.[Results]The smart irrigation measure in citrus orchards significantly increased the SPAD value of leaves at the maturation stage of citrus,and simultaneously significantly improved the photosynthetic rate,transpiration rate and stomatal conductance at the flower bud differentiation stage,as well as the photosynthetic rate,transpiration rate,stomatal conductance and intercellular CO_(2) concentration at the maturation stage.However,the effects on the photosynthetic characteristic indexes in the rainy season were not significant.Compared with conventional experience management,the smart irrigation management measure of citrus orchards increased the edible rate and juice rate of citrus by 4.53 and 3.69 percentage points,respectively,and increased soluble solids,total sugar,vitamin C and sugar-acid ratio by 16.75%,20.86%,24.10%and 13.17%,respectively.[Conclusions]The smart irrigation management fully met the water demand for citrus growth due to timely irrigation,significantly improved the photosynthesis indicators of citrus leaves during drought,and significantly improved the quality of citrus.
基金Supported by Key Research and Development Program of Guangxi(Gui Ke AB18221096)Fund of Guangxi Academy of Agricultural Sciences(2019ZX121Gui Nong Ke 2020ZX03)
文摘[Objectives]To study the characteristics of soil heavy metal contents in facility agriculture of Guangxi and analyze its risks.[Methods]The heavy metal content of 30 surface soil samples taken from facility agriculture in Guangxi was analyzed.The status of soil heavy metal pollution in facility agriculture of Guangxi was evaluated by the single factor index method,geo-accumulation index method and Hakanson potential ecological risk index method with reference to the soil background value in Guangxi.[Results]Compared with the soil background value in Guangxi,the over-limit rates of heavy metals cadmium,lead,arsenic,chromium,mercury,copper and zinc in soil samples were 56.67%,56.67%,16.67%,30.00%,50.00%,60.00%and 80.00%,respectively.Compared with the screening values of the Soil Environmental Quality-Risk Control Standard for Soil Contamination of Agricultural Land(for trial implementation)(GB15618-2018),the overlimit rates of the heavy metals cadmium,arsenic,copper and zinc in the surface soil of agricultural facilities in Guangxi were 56.67%,10.00%,16.67%and 23.33%,respectively.Except for the average content of soil cadmium exceeding the screening value,the evaluation content of the other six soil heavy metals did not exceed the screening value.According to the evaluation results of the single factor pollution index method,the surface soil arsenic and chromium of the agricultural facilities in Guangxi belonged to the clean level,lead,mercury,and copper belonged to mild pollution,and cadmium and zinc belonged to moderate pollution.According to the evaluation results of the geo-accumulation index,the lead,arsenic,chromium and mercury in the surface soil of the agricultural facilities in Guangxi belonged to the pollution-free level,while the cadmium,copper and zinc belonged to the mild-moderate pollution.According to the evaluation results of the potential ecological risk index method,the potential ecological risks of the heavy metals of lead,arsenic,chromium,copper and zinc in the soil of agricultural facilities in Guangxi belonged to low potential ecological risk level,and the potential ecological risks of cadmium and mercury belonged to moderate risk level.The potential ecological risk index(RI)of the seven heavy metals in the soil was 132.46,which belonged to moderate potential ecological risk.The largest contribution of soil heavy metals to the potential ecological risk index was cadmium and mercury.[Conclusions]Taking the soil of facility agriculture in Guangxi as the object,this paper studied the characteristics of heavy metal content in facility agricultural soil and its risk assessment,in order to provide a scientific basis for facility soil heavy metal risk prevention and control and provide safe technology for facility agriculture.
基金Supported by National Key Research and Development Program(2016YED0800705-01)Key Research and Development Program of Guangxi(Gui Ke AB16380084)+2 种基金Key Agricultural Science and Technology Program of Guangxi(201528,201604)Scientific Research and Technological Development Program Project of Nanning City(20162105)Scientific Development Fund Project of Guangxi Academy of Agricultural Sciences(Gui Nong Ke2017JM06,2017JM07)
文摘Clay minerals,phosphates,alkaline materials,organic materials are common improvers in the management of Cd polluted soil. This paper systematically summarized types of common soil improvers and their passivation mechanism of Cd in soil. It reviewed advances in researches of soil improvers. Besides,it introduced major problems in four common passivating agents for management of Cd polluted soil. Finally,according to different mechanism characteristics of passivating agents,it came up with some recommendations.
基金Science and Technology Program of Guangxi(Gui Ke AB18221096Gui Ke AB 21196019)Science and Technology Development Fund Project of Guangxi Academy of Agricultural Sciences(Gui Nong Ke 2020ZX03).
文摘[Objectives]To explore the nutrient accumulation characteristics of facility soil in different planting years in the lateritic red soil region of Guangxi.[Methods]The soil samples of facility cultivation and open field cultivation were collected in the lateritic red soil region of Guangxi,and the changes of soil pH,water-soluble salts,organic matter,available nutrients and total nutrients were analyzed.[Results]The acidification of the facility soil in the lateritic red soil region of Guangxi became more obvious with the extension of greenhouse planting years,the soil pH decreased by 0.34 units after continuous planting for 10 years,and the water-soluble content was more than 3 times that of the open field and it increased with the extension of the planting years.In addition,the degree of secondary salinization in facility soil became more serious,mainly moderate and mild salinization.The contents of soil organic matter,alkali-hydrolyzed nitrogen,available phosphorus,available potassium,total nitrogen and total phosphorus in the facility soil increased significantly,while total potassium did not change significantly.[Conclusions]This study is expected to provide a scientific basis for facility soil fertilization management,and to promote the sustainable and healthy development of facility cultivation industry.
基金Supported by Key Research and Development Project of Guangxi Zhuang Autonomous Region(GK AB1850024)。
文摘[Objectives]The paper was to explore the effects of different mulching methods on soil moisture content and water movement in citrus orchards,and to provide the theoretical basis for improving water and weed management level in orchards.[Methods]Three ground mulching treatments including spraying herbicide(CK),grass-proof cloth cover(GPC)and natural grass mowing(NGM)were set up to analyze the soil moisture content and water flux characteristics of soil profile in the soil layers of 5,20,40 and 60 cm under different mulching methods.[Results]The GPC and NGM treatments significantly increased the soil moisture content in the soil layer of 0-60 cm at the young fruit stage and fruit expansion stage,which inhibited soil water evaporation and effectively improved soil water holding capacity,thus reducing irrigation water consumption and saving water resources.During the expansion stage of citrus fruits,the soil water flux in the soil layer of 0-60 cm in NGM and CK treatments was upward,and the upward soil water flux in NGM treatment was larger,which could mobilize more upward movement of deep soil moisture for uptake by citrus roots.However,the soil water flux in the soil layer of 0-60 cm in GPC treatment was downward,and the soil moisture conditions in the upper and middle layers were already sufficient for citrus growth.[Conclusions]Both GPC and NGM treatments can increase the overall soil moisture content.In the dry season,the soil moisture content in the upper layer treated by GPC is always relatively high,while more soil water in the lower layer move to the upper layer in NGM treatment,which has met the water requirements for citrus growth.
基金Supported by Guangxi Science and Technology Plan Project(Gui Ke AB18221096&Gui Ke AB 21196019)。
文摘[Objectives]To study the remediation methods of secondary salinization and cadmium pollution in facility soil.[Methods]Two kinds of soil amendments,potassium fulvic acid and limestone powder,were selected to be applied alone or combined together to plant maize to carry out field experiments.Their effects on watermelon yield,watermelon cadmium content,soil available nitrogen,phosphorus,potassium and water-soluble salts were studied.[Results]The application of potassium fulvic acid,limestone powder and their combined application increased the yield and soluble solids of watermelon to different degrees.The contents of seven heavy metals including cadmium,copper,zinc,arsenic,lead,mercury and chromium in the watermelon of all treatments were all lower than the food safety limit stipulated in the national standard.During the harvest period of maize seedlings,all treatments could increase soil pH and decrease soil cadmium availability.In particular,3000 kg/ha of limestone powder and 1500 kg/ha of potassium fulvic acid had the best effect on reducing soil available cadmium content.In reducing soil available cadmium content,there were significant differences between single application of amendment and combined application treatments.In addition,compared with the control CK,all treatments decreased soil available nitrogen,phosphorus,potassium and water-soluble salt content.[Conclusions]Potassium fulvic acid,limestone powder and their combined application can increase the yield of watermelon,and can significantly reduce the available cadmium,nitrogen,phosphorus,potassium and water-soluble salt content in the facility soil of maize cultivation.
基金Guangxi Science and Technology Plan Project(Gui Ke AD17195026&Gui Ke AD19259007)Science and Technology Development Fund Project of Guangxi Academy of Agricultural Sciences(Gui Nong Ke 2016ZX11)Fund Project of Guangxi Academy of Agricultural Sciences(2019ZX121).
文摘[Objectives]To evaluate the status of soil nutrient and fertility in main dry farming regions of Laos,and to explore differences in soil nutrient content between regions and crop types.[Methods]By collecting 57 soil samples in the 0-20 cm layer of the main dryland in southern and northern provinces of Laos.Soil pH,organic matter,total nitrogen,available nitrogen,available phosphorus,available potassium,exchangeable calcium,exchangeable magnesium and available zinc content were analyzed.[Results]The soil in the main dry farming regions of Laos was acidic,the overall fertility level was good,and the exchangeable calcium and magnesium contents were low.There were differences in soil nutrient content in the dry farming regions of southern and northern Laos.Drylands where cassava and maize were growed had higher fertility.[Conclusions]It is suggested to apply lime or alkaline fertilizer in the dry land with acid soil to increase soil pH and increase the supply of soil calcium and magnesium.Organic fertilizer should be applied to improve soil water retention capacity,and it is necessary to pay attention to the fertilization ratio of macroelements to balance fertilization.
基金Supported by Scientific Research and Technology Development Plan Project of Nanning City(20182087)Guangxi Science and Technology Plan Project(Gui Ke AD17195026)+1 种基金Development Fund of Guangxi Academy of Agricultural Sciences(Gui Nong Ke 2020ZX032019ZX121).
文摘[Objectives]This study aimed to understand and master the nutritional characteristics of‘Jianyang Juyou’growing in southern Guangxi,with a view to providing a theoretical basis for the rational fertilization of local orchards.[Methods]The leaves of 3-year-old‘Jianyang Juyou’were sampled according to the phenological characteristics,and the dynamics in the contents of macronutrients and main trace elements N,P,K,Ca,Mg,Fe,Zn and B in the leaves were analyzed.[Results]The average contents of N,P and K in the leaves of‘Jianyang Juyou’were in the order as N>K>P.Among them,the content of N reached the highest during the flowering period and then decreased;K maintained a high content around the fruit enlargement period;the Ca content of leaves is significantly greater than that of Mg,and the peak value of Ca content appeared during the flowering and color change periods;the Mg content increased from the germination stage to the late fruit enlargement stage,while decreased in the color change stage;the average contents of main trace elements in the leaves ranked as Fe>B>Zn;the Fe content gradually increased from the germination stage to the physiological fruit drop stage,and slowly decreased after the fruit enlargement;the Zn content peaked in the physiological fruit drop period and fruit maturity period;and the B content of the leaves was 81.6-87.2 mg/kg during the flowering period,the early period of fruit enlargement,the late period of fruit enlargement,and the color change period.[Conclusions]During the phenological period,the leaves of‘Jianyang Juyou’had a higher demand for N,and the peak absorption period was mainly concentrated from the germination period to the early period of fruit enlargement;the demand for K was second only to N,and the peak absorption period was concentrated in the early stage of fruit enlargement to the mature stage;and the demand for P was minimal.In the production of‘Jianyang Juyou’Mg played an important role in promoting budding and blooming,preserving flowers and fruits and promoting fruit enlargement,so attention should be paid to the application of Mg fertilizer before the color change period.During the flowering period,the early period of fruit enlargement,the late period of fruit enlargement,and the color change period,B fertilizer could be appropriately increased by soil application or foliar spraying.Due to the large fluctuation of Zn content in leaves and small mobility of Zn,it could be supplemented quickly by spraying on the leaf surface before the physiological fruit drop period and fruit maturity period.
基金supported by National Key Research and Development Program of China(No.2018YFC1706101)The Sichuan Key Research and Development Program(No.2021YFS0043)+1 种基金Leading Talent Support Program of National Civil Commission(2021)Special Fund of Natural Science for the Central Universities(No.2020NQN42).
文摘Objective:To rapidly identify the two morphologies and chemical properties of similar herbal medicines,Blumea riparia and B.megacephala as the basis for chemical constituent analysis.Methods:UPLC-Q-Exactive-MS/MS was utilized for profiling and identification of the constituents in B.riparia and B.megacephala.Chemical pattern recognition(CPR)was further used to compare and distinguish the two herbs and to identify their potential characteristic markers.Then,an HPLC method was established for quality evaluation.Results:A total of 93 constituents are identified,including 54 phenolic acids,35 flavonoids,two saccharides,one phenolic acid glycoside,and one other constituent,of which 67 were identified in B.riparia and B.megacephala for the first time.CPR indicates that B.riparia and B.megacephala samples can be distinguished from each other based on the LC–MS data.The isochlorogenic acid A to cryptochlorogenic acid peak area ratio calculated from the HPLC chromatograms was proposed as a differentiation index for distinguishing and quality control of B.riparia and B.megacephala.Conclusion:This study demonstrates significant differences between B.riparia and B.megacephala in terms of chemical composition.The results provide a rapid and simple strategy for the comparison and evaluation of the quality of B.riparia and B.megacephala.
