[Objectives] To investigate the characteristics of arsenic content of Ophiocordyceps sinensis in Sichuan Province. [Methods]Using ICP-MS( Inductively Coupled Plasma-Mass Spectrometry),we studied the 30 samples of O. s...[Objectives] To investigate the characteristics of arsenic content of Ophiocordyceps sinensis in Sichuan Province. [Methods]Using ICP-MS( Inductively Coupled Plasma-Mass Spectrometry),we studied the 30 samples of O. sinensis from 25 places of production in Sichuan Province as well as the arsenic content in the habitat soil. [Results] The arsenic content of O. sinensis in Sichuan Province was0. 62-9. 16 mg/kg; the arsenic content in habitat soil was 3. 93-59. 90 mg/kg. [Conclusions]90% of O. sinensis products from Sichuan Province exceeded the arsenic content limit of 1 mg/kg in the health food,and as a comparison,the arsenic content of samples from Qinghai,Tibet,Gansu was over the limit.展开更多
Global climate change has been seen to result in marked impacts on forest ecosystems such as accelerated tree mortality worldwide due to incidental hydraulic failure caused by intensified and more frequent occurrence ...Global climate change has been seen to result in marked impacts on forest ecosystems such as accelerated tree mortality worldwide due to incidental hydraulic failure caused by intensified and more frequent occurrence of extreme drought and heat-waves.However,it is well understood how the tree hydrological strategies would adjust to environmental variability brough about by climate changes.Here we investigated the hydraulic adjustment as a mechanism of acclimation to different climate conditions along an altitudinal gradient in Faxon fir(Abies fargesii var.faxoniana)–a tree species that plays a key role in conservation of wildlife and maintenance of ecosystem services in subalpine forests.The hydraulic traits and selective morphological and physiological variables were measured seasonally along an altitudinal gradient from 2,800 to 3,600 m a.s.l.We found that the native percentage loss of conductivity(PLC)increased with altitude across the seasonal measurements.Both the native sapwood-specific hydraulic conductivity(Ks)and native leaf-specific hydraulic conductivity(Kl)significantly decreased with altitude for measurements in July and October,coinciding with the timing for peak growth and pre-dormancy,respectively.The morphological traits varied toward more conservative tree hydrological strategies with increases in altitude,exhibiting trade-offs with hydraulic traits.The total non-structural carbohydrates in both needle(NSCNeedle)and branch(NSCBranch)as well as photosynthetic capacity of current-year leaves played variable roles in maintaining the integrity of the hydraulic functioning and shaping the hydraulic adjustment under prevailing environmental conditions.Our findings indicate that Faxon fir possesses some degree of hydraulic adaptability to water limitation imposed by climate fluctuations in subalpine region through morphological and physiological modifications.展开更多
DEAR EDITOR,A new torrent catfish species,Liobagrus chengduensis sp.nov.,is described from the Xihe River,a tributary of the Minjiang River,Qionglai City,Chengdu City,Sichuan Province,China.It can be distinguished fro...DEAR EDITOR,A new torrent catfish species,Liobagrus chengduensis sp.nov.,is described from the Xihe River,a tributary of the Minjiang River,Qionglai City,Chengdu City,Sichuan Province,China.It can be distinguished from all other congeneric species by a unique combination of the following characters:3-4 serrations on posterior edge of pectoral-fin spine;anal fin with 15-16 rays;upper jaw obviously shorter than lower jaw;caudal fin rounded,with 42-44 rays;vertebral column with 36-37 post-Weberian elements;anus close to pelvic-fin insertion;adipose fin posteriorly continuous with caudal fin,with marked incision at confluence;body generally brownish yellow;all fins lacking well-defined light-colored margins,with color fading towards edge.展开更多
[Objectives] This study was conducted to explore the fertilization ratio of walnut, so as to provide a basis for rational fertilization of walnut. [Methods] Under the condition of gravelly yellow soil in Chaotian Dist...[Objectives] This study was conducted to explore the fertilization ratio of walnut, so as to provide a basis for rational fertilization of walnut. [Methods] Under the condition of gravelly yellow soil in Chaotian District, Guangyuan City, the orthogonal design of L_9(3~4) was used to test the fertilization ratio of nitrogen, phosphorus and potassium fertilizers. [Results] The effects of nitrogen, phosphorus and potassium fertilizers on walnut yield ranked as phosphate fertilizer>potassium fertilizer>nitrogen fertilizer. The different treatments had great effects on the yield of walnut, and for the land with gravelly yellow soil, the suitable annual fertilization amount of walnut was urea 1 200 g/plant + calcium superphosphate 1 500 g/plant + potassium sulfate 940 g/plant. [Conclusions] This study provides a theoretical basis for rational fertilization of walnut in Sichuan Province.展开更多
The situation of plants on the slope can reflect the effect of vegetation restoration during the process of artificial vegetation recovery.Taking the typical damaged slope of Wenchuan earthquake area as the research o...The situation of plants on the slope can reflect the effect of vegetation restoration during the process of artificial vegetation recovery.Taking the typical damaged slope of Wenchuan earthquake area as the research object,through observing the vegetation situation of deserted slope,the results show that compositae plants and gramineous plants are suitable for being pioneer plants and dominant in community; during the vegetation succession,many compositae and gramineous species invade,but there is no magaphanerophytes invading; as time goes by,the herbaceous species and diversity increase gradually,so the ecosystem becomes more stable and the gradient is important for the vegetation restoration.展开更多
To investigate plant biomass and nutrient distribution and accumulation in organs of Alnus cremastogyne at different ages from 1 to 4 years,the biomass,N,P,K,Ca,Mg,Fe and Zn were tested. The results showed that the av...To investigate plant biomass and nutrient distribution and accumulation in organs of Alnus cremastogyne at different ages from 1 to 4 years,the biomass,N,P,K,Ca,Mg,Fe and Zn were tested. The results showed that the average biomass of the whole tree and the biomass of leaf,branch,stem,and root were in positive correlation with tree age,but the growth rate of biomass had a decreasing trend with the tree age increasing,and only the biomass proportion of the trunk in the whole individual plant showed an increasing trend with age. The contents of nutrient elements in organs showed an order of N > Ca > K > Mg > P > Fe > Zn;and the contents of N,P and K were higher in the leaf than in other organs,and the contents of Ca,Mg and Fe in the root were higher than in other organs. The accumulations of N,P,K,Ca,Mg and Zn were the highest in the trunk,and that of Fe was the highest in the root. The annual net accumulations of N,P,K,Ca and Mg in the average trees from 1 to 4 years old were 17. 07,40. 79,95. 82 and 106. 71 g,respectively,and the annual net accumulations of microelements( Fe and Zn) were 335. 04,577. 26,1267 and 1525. 27 mg,respectively.展开更多
基金Supported by Special Fiscal Funds in Sichuan Province(ZL2017-06)
文摘[Objectives] To investigate the characteristics of arsenic content of Ophiocordyceps sinensis in Sichuan Province. [Methods]Using ICP-MS( Inductively Coupled Plasma-Mass Spectrometry),we studied the 30 samples of O. sinensis from 25 places of production in Sichuan Province as well as the arsenic content in the habitat soil. [Results] The arsenic content of O. sinensis in Sichuan Province was0. 62-9. 16 mg/kg; the arsenic content in habitat soil was 3. 93-59. 90 mg/kg. [Conclusions]90% of O. sinensis products from Sichuan Province exceeded the arsenic content limit of 1 mg/kg in the health food,and as a comparison,the arsenic content of samples from Qinghai,Tibet,Gansu was over the limit.
基金supported by the National Key Research and Development Program of the Ministry of Science and Technology of China(Grant No.2016YFC0502104).
文摘Global climate change has been seen to result in marked impacts on forest ecosystems such as accelerated tree mortality worldwide due to incidental hydraulic failure caused by intensified and more frequent occurrence of extreme drought and heat-waves.However,it is well understood how the tree hydrological strategies would adjust to environmental variability brough about by climate changes.Here we investigated the hydraulic adjustment as a mechanism of acclimation to different climate conditions along an altitudinal gradient in Faxon fir(Abies fargesii var.faxoniana)–a tree species that plays a key role in conservation of wildlife and maintenance of ecosystem services in subalpine forests.The hydraulic traits and selective morphological and physiological variables were measured seasonally along an altitudinal gradient from 2,800 to 3,600 m a.s.l.We found that the native percentage loss of conductivity(PLC)increased with altitude across the seasonal measurements.Both the native sapwood-specific hydraulic conductivity(Ks)and native leaf-specific hydraulic conductivity(Kl)significantly decreased with altitude for measurements in July and October,coinciding with the timing for peak growth and pre-dormancy,respectively.The morphological traits varied toward more conservative tree hydrological strategies with increases in altitude,exhibiting trade-offs with hydraulic traits.The total non-structural carbohydrates in both needle(NSCNeedle)and branch(NSCBranch)as well as photosynthetic capacity of current-year leaves played variable roles in maintaining the integrity of the hydraulic functioning and shaping the hydraulic adjustment under prevailing environmental conditions.Our findings indicate that Faxon fir possesses some degree of hydraulic adaptability to water limitation imposed by climate fluctuations in subalpine region through morphological and physiological modifications.
文摘DEAR EDITOR,A new torrent catfish species,Liobagrus chengduensis sp.nov.,is described from the Xihe River,a tributary of the Minjiang River,Qionglai City,Chengdu City,Sichuan Province,China.It can be distinguished from all other congeneric species by a unique combination of the following characters:3-4 serrations on posterior edge of pectoral-fin spine;anal fin with 15-16 rays;upper jaw obviously shorter than lower jaw;caudal fin rounded,with 42-44 rays;vertebral column with 36-37 post-Weberian elements;anus close to pelvic-fin insertion;adipose fin posteriorly continuous with caudal fin,with marked incision at confluence;body generally brownish yellow;all fins lacking well-defined light-colored margins,with color fading towards edge.
基金Supported by Technological Achievements Transformation Fund for Research Institutes in Sichuan Province(14010112)
文摘[Objectives] This study was conducted to explore the fertilization ratio of walnut, so as to provide a basis for rational fertilization of walnut. [Methods] Under the condition of gravelly yellow soil in Chaotian District, Guangyuan City, the orthogonal design of L_9(3~4) was used to test the fertilization ratio of nitrogen, phosphorus and potassium fertilizers. [Results] The effects of nitrogen, phosphorus and potassium fertilizers on walnut yield ranked as phosphate fertilizer>potassium fertilizer>nitrogen fertilizer. The different treatments had great effects on the yield of walnut, and for the land with gravelly yellow soil, the suitable annual fertilization amount of walnut was urea 1 200 g/plant + calcium superphosphate 1 500 g/plant + potassium sulfate 940 g/plant. [Conclusions] This study provides a theoretical basis for rational fertilization of walnut in Sichuan Province.
基金Supported by The Balanced Fertilization Technology of the Main Fast-growing Trees in Sichuan Province(JB201412)
文摘The situation of plants on the slope can reflect the effect of vegetation restoration during the process of artificial vegetation recovery.Taking the typical damaged slope of Wenchuan earthquake area as the research object,through observing the vegetation situation of deserted slope,the results show that compositae plants and gramineous plants are suitable for being pioneer plants and dominant in community; during the vegetation succession,many compositae and gramineous species invade,but there is no magaphanerophytes invading; as time goes by,the herbaceous species and diversity increase gradually,so the ecosystem becomes more stable and the gradient is important for the vegetation restoration.
基金Supported by Project of Science and Technology Department in Sichuan Province(2016NZ0043)
文摘To investigate plant biomass and nutrient distribution and accumulation in organs of Alnus cremastogyne at different ages from 1 to 4 years,the biomass,N,P,K,Ca,Mg,Fe and Zn were tested. The results showed that the average biomass of the whole tree and the biomass of leaf,branch,stem,and root were in positive correlation with tree age,but the growth rate of biomass had a decreasing trend with the tree age increasing,and only the biomass proportion of the trunk in the whole individual plant showed an increasing trend with age. The contents of nutrient elements in organs showed an order of N > Ca > K > Mg > P > Fe > Zn;and the contents of N,P and K were higher in the leaf than in other organs,and the contents of Ca,Mg and Fe in the root were higher than in other organs. The accumulations of N,P,K,Ca,Mg and Zn were the highest in the trunk,and that of Fe was the highest in the root. The annual net accumulations of N,P,K,Ca and Mg in the average trees from 1 to 4 years old were 17. 07,40. 79,95. 82 and 106. 71 g,respectively,and the annual net accumulations of microelements( Fe and Zn) were 335. 04,577. 26,1267 and 1525. 27 mg,respectively.
