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Salt Contents in Soils Under Plastic Greenhouse Gardening in China 被引量:67
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作者 LIWENQING S.VANDERZEE 《Pedosphere》 SCIE CAS CSCD 2001年第4期359-367,共9页
Field experiments were conducted on three main soils, brown soil, meadow soil and cinnamon soil, of Shandong Province to study the effect of plastic greenhouse gardening on soil salt contents. As compared to the open ... Field experiments were conducted on three main soils, brown soil, meadow soil and cinnamon soil, of Shandong Province to study the effect of plastic greenhouse gardening on soil salt contents. As compared to the open fields, the soil nutrient contents in the fields under plastic greenhouse gardening all increased significantly. The organic matter, quickly available N and P increases were extremely significant and the quickly available K increase was also significant. Along with the nutrient increases the soil salt contents increased clearly in all the soils investigated not only in the top layer but also in the deeper layers, being extremely significant in the 0~10 cm layer and significant in the 10~40 cm layers. The salt contents in the plastic greenhouses had significant correlations with the soil available nitrogen and phosphorous. Soils with longer plastic greenhouse gardening time tended to have more salt. The plastic greenhouse soils contained less CO-3~(2-) and much more NO-3 than the open soils, which indicated a higher influence of human intervention in plastic greenhouses. Among the constituent ions, Cl~(-), NO-3~(-) , Ca~(2+) and Mg~(2+) had positive while HCO-3~(-) had negative significant or extremely significant correlations with total salt, with correlation coefficients being 0.66*, 0.80**, 0.92**, 0.80** and -0.64* , respectively. Nitrate decreased from the top to deeper layers both in the plastic greenhouses and in the open fields. The plastic greenhouse soils contained much more nitrate than the open fields in every layer and even the nitrate contents of the 80~l00 cm layer were still several times those of the top layer in the open fields. The main reason for the salt increases was considered to be the inappropriate fertilization and selective absorption of nutrients by plants in the plastic greenhouses. The methods recommended to avoid soil salt increase in the plastic greenhouses were to apply fertilizers rationally according to the soils, vegetables and fertilizer properties and to adopt a good intercropping or rotation system. 展开更多
关键词 FERTILIZATION NITRATE plastic greenhouse salt content VEGETABLE
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Monitoring Soil Salt Content Using HJ-1A Hyperspectral Data: A Case Study of Coastal Areas in Rudong County, Eastern China 被引量:5
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作者 LI Jianguo PU Lijie +5 位作者 ZHU Ming DAI Xiaoqing XU Yan CHEN Xinjian ZHANG Lifang ZHANG Runsen 《Chinese Geographical Science》 SCIE CSCD 2015年第2期213-223,共11页
Hyperspectral data are an important source for monitoring soil salt content on a large scale. However, in previous studies, barriers such as interference due to the presence of vegetation restricted the precision of m... Hyperspectral data are an important source for monitoring soil salt content on a large scale. However, in previous studies, barriers such as interference due to the presence of vegetation restricted the precision of mapping soil salt content. This study tested a new method for predicting soil salt content with improved precision by using Chinese hyperspectral data, Huan Jing-Hyper Spectral Imager(HJ-HSI), in the coastal area of Rudong County, Eastern China. The vegetation-covered area and coastal bare flat area were distinguished by using the normalized differential vegetation index at the band length of 705 nm(NDVI705). The soil salt content of each area was predicted by various algorithms. A Normal Soil Salt Content Response Index(NSSRI) was constructed from continuum-removed reflectance(CR-reflectance) at wavelengths of 908.95 nm and 687.41 nm to predict the soil salt content in the coastal bare flat area(NDVI705 < 0.2). The soil adjusted salinity index(SAVI) was applied to predict the soil salt content in the vegetation-covered area(NDVI705 ≥ 0.2). The results demonstrate that 1) the new method significantly improves the accuracy of soil salt content mapping(R2 = 0.6396, RMSE = 0.3591), and 2) HJ-HSI data can be used to map soil salt content precisely and are suitable for monitoring soil salt content on a large scale. 展开更多
关键词 soil salt content normalized differential vegetation index(NDVI) hyperspectral data Huan Jing-Hyper Spectral Imager(HJ-HSI) coastal area eastern China
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Quantitative retrieval of soil salt content based on measured spectral data
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作者 HanChen Duan Tao Wang +2 位作者 Xian Xue CuiHua Huang ChangZhen Yan 《Research in Cold and Arid Regions》 CSCD 2016年第6期507-515,共9页
Choosing the Minqin Oasis, located downstream of the Shiyang River in Northwest China, as the study area, we used field-measured hyperspectral data and laboratory-measured soil salt content data to analyze the charact... Choosing the Minqin Oasis, located downstream of the Shiyang River in Northwest China, as the study area, we used field-measured hyperspectral data and laboratory-measured soil salt content data to analyze the characteristics of saline soil spectral reflectance and its transformation in the area, and elucidated the relations between the soil spectral re-flectance, reflectance transformation, and soil salt content. In addition, we screened sensitive wavebands. Then, a multiple linear regression model was established to predict the soil salt content based on the measured spectral data, and the accuracy of the model was verified using field-measured salinity data. The results showed that the overall shapes of the spectral curves of soils with different degrees of salinity were consistent, and the reflectance in visible and near-infrared bands for salinized soil was higher than that for non-salinized soil. After differential transformation, the correlation coefficient between the spectral reflectance and soil salt content was obviously improved. The first-order differential transformation model based on the logarithm of the reciprocal of saline soil spectral reflectance produced the highest accuracy and stability in the bands at 462 and 636 nm; the determination coefficient was 0.603, and the root mean square error was 5.407. Thus, the proposed model provides a good reference for the quantitative extraction and monitoring of regional soil salinization. 展开更多
关键词 spectral reflectance soil salt content SALINIZATION multiple linear regression Minqin Oasis
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Influences of soil moisture and salt content on loess shear strength in the Xining Basin, northeastern Qinghai-Tibet Plateau 被引量:12
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作者 FU Jiang-tao HU Xia-song +5 位作者 LI Xi-lai YU Dong-mei LIU Ya-bin YANG You-Qing QI Zhao-xin LI Shu-xia 《Journal of Mountain Science》 SCIE CSCD 2019年第5期1184-1197,共14页
Moisture and salt content of soil are the two predominant factors influencing its shear strength. This study aims to investigate the effects of these two factors on shear strength behavior of loess in the Xining Basin... Moisture and salt content of soil are the two predominant factors influencing its shear strength. This study aims to investigate the effects of these two factors on shear strength behavior of loess in the Xining Basin of Northeast Qinghai-Tibet Plateau, where such geological hazards as soil erosion, landslides collapse and debris flows are widespread due to the highly erodible loess. Salinized loess soil collected from the test site was desalinized through salt-leaching in the laboratory. The desalinized and oven-dried loess samples were also artificially moisturized and salinized in order to examine how soil salinity affects its shear strength at different moisture levels. Soil samples prepared in different ways(moisturizing, salt-leaching, and salinized) were measured to determine soil cohesion and internal friction angle. The results show that salt-leaching up to 18 rounds almost completely removed the salt content and considerably changed the physical components of loess, but the soil type remained unchanged. As salt content increases from 0.00% to 12.00%, both the cohesion and internal friction angle exhibit an initial decrease and then increase with salt content. As moisture content is 12.00%, the salt content threshold value for both cohesion and internal friction angle is identified as 3.00%. As the moisture content rises to 16.0% and 20.00%, the salt content threshold value for cohesion is still 6.00%, but 3.00% for internal friction angle. At these thresholds soil shear strength is the lowest, below which it is inversely related to soil salinity. Beyond the thresholds, however, the relationship is positive. Dissimilar to salinity, soil moisture content exerts an adverse effect on shear strength of loess. The findings of this study can provide a valuable guidance on stabilizing the engineering properties of salinized loess to prevent slope failures during heavy rainfall events. 展开更多
关键词 Salinized LOESS Desalinized LOESS salt-leaching Shear strength indices Moisture content salt content
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Derivation of salt content in salinized soil from hyperspectral reflectance data: A case study at Minqin Oasis, Northwest China 被引量:4
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作者 QIAN Tana Atsushi TSUNEKAWA +3 位作者 PENG Fei Tsugiyuki MASUNAGA WANG Tao LI Rui 《Journal of Arid Land》 SCIE CSCD 2019年第1期111-122,共12页
Soil salinization is a serious ecological and environmental problem because it adversely affects sustainable development worldwide, especially in arid and semi-arid regions. It is crucial and urgent that advanced tech... Soil salinization is a serious ecological and environmental problem because it adversely affects sustainable development worldwide, especially in arid and semi-arid regions. It is crucial and urgent that advanced technologies are used to efficiently and accurately assess the status of salinization processes. Case studies to determine the relations between particular types of salinization and their spectral reflectances are essential because of the distinctive characteristics of the reflectance spectra of particular salts. During April 2015 we collected surface soil samples(0–10 cm depth) at 64 field sites in the downstream area of Minqin Oasis in Northwest China, an area that is undergoing serious salinization. We developed a linear model for determination of salt content in soil from hyperspectral data as follows. First, we undertook chemical analysis of the soil samples to determine their soluble salt contents. We then measured the reflectance spectra of the soil samples, which we post-processed using a continuum-removed reflectance algorithm to enhance the absorption features and better discriminate subtle differences in spectral features. We applied a normalized difference salinity index to the continuum-removed hyperspectral data to obtain all possible waveband pairs. Correlation of the indices obtained for all of the waveband pairs with the wavebands corresponding to measured soil salinities showed that two wavebands centred at wavelengths of 1358 and 2382 nm had the highest sensitivity to salinity. We then applied the linear regression modelling to the data from half of the soil samples to develop a soil salinity index for the relationships between wavebands and laboratory measured soluble salt content. We used the hyperspectral data from the remaining samples to validate the model. The salt content in soil from Minqin Oasis were well produced by the model. Our results indicate that wavelengths at 1358 and 2382 nm are the optimal wavebands for monitoring the concentrations of chlorine and sulphate compounds, the predominant salts at Minqin Oasis. Our modelling provides a reference for future case studies on the use of hyperspectral data for predictive quantitative estimation of salt content in soils in arid regions. Further research is warranted on the application of this method to remotely sensed hyperspectral data to investigate its potential use for large-scale mapping of the extent and severity of soil salinity. 展开更多
关键词 SALINITY index soil salt content spectral reflectance waveband PAIRS ARID regions
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A preliminary study on an upper ocean heat and salt content of the western Pacific warm pool region
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作者 Xiaoxin Yang Xiaofen Wu +1 位作者 Zenghong Liu Chunxin Yuan 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2019年第3期60-71,共12页
On the basis of Argo profile data of the temperature and salinity from January 2001 to July 2014, the spatial distributions of an upper ocean heat content(OHC) and ocean salt content(OSC) of the western Pacific warm p... On the basis of Argo profile data of the temperature and salinity from January 2001 to July 2014, the spatial distributions of an upper ocean heat content(OHC) and ocean salt content(OSC) of the western Pacific warm pool(WPWP) region and their seasonal and interannual variations are studied by a cyclostationary empirical orthogonal function(CSEOF) decomposition, a maximum entropy spectral analysis, and a correlation analysis.Probable reasons for variations are discussed. The results show the following.(1) The OHC variations in the subsurface layer of the WPWP are much greater than those in the surface layer. On the contrary, the OSC variations are mainly in the surface layer, while the subsurface layer varies little.(2) Compared with the OSC, the OHC of the WPWP region is more affected by El Ni?o-Southern Oscillation(ENSO) events. The CSEOF analysis shows that the OHC pattern in mode 1 has strong interannual oscillation, with eastern and western parts opposite in phase. The distribution of the OSC has a positive-negative-positive tripole pattern. Time series analysis shows that the OHC has three phase adjustments with the occurrence of ENSO events after 2007, while the OSC only had one such adjustment during the same period. Further analysis indicates that the OHC variations are mainly caused by ENSO events, local winds, and zonal currents, whereas the OSC variations are caused by much more complex reasons. Two of these, the zonal current and a freshwater flux, have a positive feedback on the OSC change in the WPWP region. 展开更多
关键词 ocean HEAT content salt content the western PACIFIC WARM pool ARGO data
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Effects of irrigation water salinity on soil salt content distribution,soil physical properties and water use efficiency of maize for seed production in arid Northwest China 被引量:6
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作者 Chengfu Yuan Shaoyuan Feng +2 位作者 Juan Wang Zailin Huo Quanyi Ji 《International Journal of Agricultural and Biological Engineering》 SCIE EI CAS 2018年第3期137-145,共9页
In order to explore the use of groundwater resources,field experiments were conducted for three consecutive years during 2012-2014 in the Shiyang River basin of Northwest China.Irrigation was conducted using four diff... In order to explore the use of groundwater resources,field experiments were conducted for three consecutive years during 2012-2014 in the Shiyang River basin of Northwest China.Irrigation was conducted using four different water salinity levels that were arranged in a split plot design.These four water salinity levels were s0,s3,s6 and s9(0.71,3,6 and 9 g/L,respectively).The soil salt content,soil bulk density,soil porosity,saturated hydraulic conductivity,plant height,leaf area index and yield of maize for seed production were measured for studying the effects of saline water irrigation on soil salt content distribution,soil physical properties and water use efficiency.It was observed that higher salinity level of irrigation water and long duration of saline water irrigation resulted in more salt accumulation.Compared to initial values,the soil salt accumulation in 0-100 cm soil layer after three years of experiments for s0,s3,s6 and s9 was 0.189 mg/cm3,0.654 mg/cm3,0.717 mg/cm3 and 1.135 mg/cm3,respectively.Both greater salt levels in the irrigation water and frequent saline water irrigation led to greater soil bulk density,but poorer soil porosity and less saturated hydraulic conductivity.The saturated hydraulic conductivity decreased with increase in soil bulk density,but increased with improvement in soil porosity.It was noted that the maize height,leaf area index and maize yield gradually decreased with increase in water salinity.The maize yield decreased over 25%and the water use efficiency also gradually declined when irrigated with water containing 6 g/L and 9 g/L salinity levels.However,maize yield following saline water irrigation with 3 g/L decreased less than 20%and the decline in water use efficiency was not significant during the three-year experiment period.The results demonstrate that irrigation with saline water at the level of 6 g/L and 9 g/L in the study area is not suitable,while saline water irrigation with 3 g/L would be acceptable for a short duration together with salt leaching through spring irrigation before sowing. 展开更多
关键词 saline water irrigation soil salt content distribution soil physical properties maize for seed production water use efficiency
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Effects of Groundwater with Various Salinities on Evaporation and Redistribution of Water and Salt in Saline-sodic Soils in Songnen Plain,Northeast China
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作者 ZHU Wendong ZHAO Dandan +6 位作者 YANG Fan WANG Zhichun DONG Shide AN Fenghua MA Hongyuan ZHANG Lu TIBOR Tóth 《Chinese Geographical Science》 SCIE CSCD 2023年第6期1141-1152,共12页
Groundwater mineralization is one of the main factors affecting the transport of soil water and salt in saline-sodic areas.To investigate the effects of groundwater with different levels of salinity on evaporation and... Groundwater mineralization is one of the main factors affecting the transport of soil water and salt in saline-sodic areas.To investigate the effects of groundwater with different levels of salinity on evaporation and distributions of soil water and salt in Songnen Plain,Northeast China,five levels of groundwater sodium adsorption ration of water(SARw)and total salt content(TSC mmol/L)were conducted in an oil column lysimeters.The five treated groundwater labeled as ST0:0,ST0:10,ST5:40,ST10:70 and ST20:100,were prepared with NaCl and CaCl2 in proportion,respectively.The results showed the groundwater evaporation(GWE)and soil evaporation(SE)increased firstly and then decreased with the increase of groundwater salinity.The values of GWE and SE in ST10:70 treatment were the highest,which were 2.09 and 1.84 times the values in the ST0:0 treatment with the lowest GWE and SE.There was a positive linear correlation between GWE and the Ca^(2+)content in groundwater,with R^(2)=0.998.The soil water content(SWC)of ST0:0 treatment was significantly(P<0.05)less than those of other treatments during the test.The SWC of the ST0:0 and ST0:10 treatments increased with the increase of soil depth,while the other treatments showed the opposite trend.Statistical analysis indicated the SWC in the 0–60 cm soil layer was positively correlated with the groundwater TSC and its ion contents during the test.Salt accumulation occurred in the topsoil and the salt accumulation in the 0–20 cm soil layer was significantly(P<0.05)greater than that in the subsoil.This study revealed the effects of the salinity level of groundwater,especially the Ca^(2+)content and TSC of groundwater,on the GWE and distributions of soil water and salt,which provided important support for the prevention and reclamation of soil salinization and sodificaton in shallow groundwater regions. 展开更多
关键词 groundwater evaporation sodium adsorption ratio total salt content ion composition soil salinization water and salt dynamics Songnen Plain China
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Effects of Storage and Cooking on the lodine Content in lodized Salt and Study on Monitoring lodine Content in Iodized Salt 被引量:2
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作者 WANG GUANG-YA ZHOU RUI-HUA +1 位作者 WANG ZHU SHI LEI and SUN MING(Departmens of Food Chemistry, Institute of Natrition and Food Hygiene,Chinese Academy of Preventive Medicine, Beijing 100050, China) 《Biomedical and Environmental Sciences》 SCIE CAS CSCD 1999年第1期1-9,共9页
In order to ensure that the intake of iodine from iodized salt is adequate, the effects of cooking, storage and iedination on iodine content in iodized salt have been studied. For moni toring the analytical Performanc... In order to ensure that the intake of iodine from iodized salt is adequate, the effects of cooking, storage and iedination on iodine content in iodized salt have been studied. For moni toring the analytical Performance, a qoality control exawhnation was also undertaken. The loss of iodine was greater when salt was stored in plastic bag than in glass bottle. The loss was greater in fortified salt stored at 37℃ and under 76% humidity than in that at 20 ~ 25℃ and under lower humidity. The retention of iodine varied with the kind of has and also was influenced by the water content of cooked food. In general, the retention of iodine during cooking varied considerably (from 36. 6% to 86. 1 % ). The iodine concentration in salts varied greater from 3.0 to 100.3 mg/kg in salt for markets, and from 0 to 90.0 mg/kg in salts for households. 48. 3 % of samples from markets were found to be in compliance with national standards (30 ~ 50 mg/kg), and 72.0% of samples from households were in compliance with national standartl (20 ~ 50 mg/kg). Analytical data collected from 8 of the cooperative laheratories foran analytical reference material showed a 95% codridence interval of the population mean for both precision and accuracy, falling within X± 2SD and passing quality control exdrination 展开更多
关键词 Effects of Storage and Cooking on the lodine content in lodized salt and Study on Monitoring lodine content in Iodized salt
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Water Absorption Capcapability and Moisture Content Seasonal Changing of Salt-Crust in Lop Nur Dry Lake
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作者 KONG Deyong LI Baoguo +3 位作者 MA Lichun JIANG Ping'an WU Hongqi LIU Hongpeng 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2014年第S1期183-184,共2页
The Lop Nur dry salt lake,Xinjiang province,is charactered by typical physiognomy salt-crust,located in39.6-41.3N.latitude and 89.6-91.4E.longitude.The thickness of salt-crust is about from 20 cm to 100 cm,and
关键词 Lop Nur Dry Lake salt-Crust Moisture content Water Absorption Capcapability
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基于透射图像的高压脉动腌制咸鸭蛋含盐量检测
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作者 白竣文 靳家欣 +3 位作者 孙力 梁小祥 田潇瑜 蔡健荣 《农业工程学报》 EI CAS CSCD 北大核心 2024年第8期245-253,共9页
含盐量是衡量咸鸭蛋品质的重要指标。为了利用机器视觉技术实现高压脉动腌制咸鸭蛋含盐量的无损检测。该研究采用工业相机和透射光源搭建咸鸭蛋的透射图像采集装置。采用图像整体特征和长轴截面光强度特征两种特征提取方法,利用多元线... 含盐量是衡量咸鸭蛋品质的重要指标。为了利用机器视觉技术实现高压脉动腌制咸鸭蛋含盐量的无损检测。该研究采用工业相机和透射光源搭建咸鸭蛋的透射图像采集装置。采用图像整体特征和长轴截面光强度特征两种特征提取方法,利用多元线性回归、支持向量机回归两种算法,建立对蛋清、蛋黄及全蛋含盐量以及蛋黄指数的定量预测模型。结果表明,随着咸鸭蛋腌制时间的增加,其透光性显著提高。同时,透射图像蛋黄的所在视野区域会随着含盐量的增加而呈现规律性的变化。基于图像整体特征建立的蛋清、蛋黄、全蛋含盐量模型较优,在蛋黄指数预测下基于长轴截面光强度特征所建模型较优。其中,基于图像整体特征所建立的蛋黄含盐量支持向量机回归(support vector regression,SVR)模型最优,测试集相关系数(test set correlation coefficient,Rp)、测试集均方根误差(root mean square error of prediction,RMSEp)、相对分析误差(residual predictive deviation,RPD)分别达到0.8460、0.3416、1.898;基于长轴截面光强度特征建立的蛋黄指数多元线性回归(multiple linear regression,MLR)模型最优,测试集相关系数Rp、均方根误差RMSEp、相对分析误差RPD分别为0.8318、0.0743、1.916。该研究结果为咸鸭蛋含盐量的快速检测提供理论依据和技术支持。 展开更多
关键词 透射图像 咸鸭蛋 含盐量 机器视觉 无损检测
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基于多臂结构抗高温高盐降滤失剂的合成及作用机制
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作者 张颖 余维初 +3 位作者 丁飞 舒文明 吴爱斌 丁伟俊 《中国石油大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第4期149-159,共11页
以季戊四醇烯丙基醚为核心,合成具有多臂结构的超支化聚合物降滤失剂JHPAN,研究和分析JHPAN配制的钻井液在高温、高盐条件下的流变性能、降滤失性能和降滤失作用机制。结果表明:在加量(质量分数)为1.0%时,220℃老化前后,淡水浆的表观黏... 以季戊四醇烯丙基醚为核心,合成具有多臂结构的超支化聚合物降滤失剂JHPAN,研究和分析JHPAN配制的钻井液在高温、高盐条件下的流变性能、降滤失性能和降滤失作用机制。结果表明:在加量(质量分数)为1.0%时,220℃老化前后,淡水浆的表观黏度分别为10.5和10.0 mPa·s,塑性黏度分别为9.0和11.0 mPa·s,动切力分别为1.5和1.0 Pa;在加量为1.0%时,220℃老化16 h后,饱和NaCl盐水浆的API滤失量和高温高压滤失量分别为11.8和25.5 mL;JHPAN的多臂结构中含有大量的吸附基团和抗温耐盐基团有助于钻井液高温、高盐环境下形成致密的泥饼,从而提升其降滤失效果。 展开更多
关键词 钻井液 高温 高盐 超支化聚合物 降滤失剂
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滨海黏质盐渍土饱和泥浆与不同土水比土壤浸提液电导率的响应关系分析
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作者 王璐 胡鑫慧 +4 位作者 张岸清 郭洪海 郭徽 刘振林 贾曦 《山东农业科学》 北大核心 2024年第6期152-158,共7页
为统一和精准判定耐盐作物种植地块的土壤盐渍化程度,并针对饱和泥浆制备时饱和点的不确定性及其电导率测定的不稳定性等问题,本试验采用室内化验与统计分析方法,系统研究饱和泥浆与饱和土壤溶液两者间含水量和电导率的响应关系,以及饱... 为统一和精准判定耐盐作物种植地块的土壤盐渍化程度,并针对饱和泥浆制备时饱和点的不确定性及其电导率测定的不稳定性等问题,本试验采用室内化验与统计分析方法,系统研究饱和泥浆与饱和土壤溶液两者间含水量和电导率的响应关系,以及饱和泥浆电导率、全盐含量与土水比1∶0.5、1∶1、1∶2.5、1∶3.5、1∶5土壤浸提液电导率与全盐含量的响应和换算关系。结果表明:在滨海黏质盐渍土区,利用计算田间土壤孔隙度得到的饱和土壤溶液含水量、电导率不能直接代替饱和泥浆含水量、电导率,尽管二者的响应关系达到极显著水平;饱和泥浆电导率、全盐含量分别与土水比1∶1和1∶0.5土壤浸提液的数值差异最小,且与土水比1∶0.5~1∶5间各处理土壤浸提液的相应指标均呈极显著的响应关系;饱和泥浆电导率与土水比1∶5土壤浸提液的电导率、饱和泥浆全盐含量与土水比1∶1土壤浸提液全盐含量相关性最高,可分别用最佳拟合线性模型进行换算,模型分别为ECe(mS/cm)=5.406EC1∶5-0.284 4,TSe(g/kg)=0.836 4TS1∶1-0.135 9。 展开更多
关键词 黏质盐渍土 土水比 饱和泥浆 土壤浸提液 电导率 全盐含量
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盐渍土路基含盐量的演化规律研究
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作者 李飞 于振涛 《地下空间与工程学报》 CSCD 北大核心 2024年第S01期344-349,共6页
虽然目前针对盐渍土的研究比较多,但基本上都集中在项目勘察设计及建设期,对利用盐渍土填筑的路堤中含盐量随时间变化的规律,国内外研究还比较少。为了探究盐渍土路基填料中含盐量随时间的变化规律,为改建项目中盐渍土路基设计提供理论... 虽然目前针对盐渍土的研究比较多,但基本上都集中在项目勘察设计及建设期,对利用盐渍土填筑的路堤中含盐量随时间变化的规律,国内外研究还比较少。为了探究盐渍土路基填料中含盐量随时间的变化规律,为改建项目中盐渍土路基设计提供理论支撑,本文依托巴基斯坦罗赫里至木尔坦段既有铁路提速改造项目,通过现场调查及大量现场试验,对比分析既有路基填料及两侧原状土中含盐量,总结出盐渍土路基变化规律。结果表明:采用盐渍土填筑的路堤,路基填土中含盐量随着时间推移逐渐降低,逐渐过渡为非盐渍土;对于新建路基采用盐渍土填筑时,采用加宽路基面、放缓路堤坡率等工程措施,同时优先安排施工,静置浸润后,可有效降低路基填料中含盐量,直接采用盐渍土填筑路基既节约工程投资,又能确保路基的安全稳定。 展开更多
关键词 盐渍土 既有线 含盐量 毛细水上升
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Experimental investigation into the salinity effect on the physicomechanical properties of carbonate saline soil
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作者 Jiejie Shen Qing Wang +3 位作者 Yating Chen Xuefei Zhang Yan Han Yaowu Liu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第5期1883-1895,共13页
For engineering structures with saline soil as a filling material,such as channel slope,road subgrade,etc.,the rich soluble salt in the soil is an important potential factor affecting their safety performance.This stu... For engineering structures with saline soil as a filling material,such as channel slope,road subgrade,etc.,the rich soluble salt in the soil is an important potential factor affecting their safety performance.This study examines the Atterberg limits,shear strength,and compressibility of carbonate saline soil samples with different NaHCO3 contents in Northeast China.The mechanism underlying the influence of salt content on soil macroscopic properties was investigated based on a volumetric flask test,a mercury intrusion porosimetry(MIP)test,and a scanning electron microscopic(SEM)test.The results demonstrated that when NaHCO3 contents were lower than the threshold value of 1.5%,the bound water film adsorbed on the surface of clay particles thickened continuously,and correspondingly,the Atterberg limits and plasticity index increased rapidly as the increase of sodium ion content.Meanwhile,the bonding force between particles was weakened,the dispersion of large aggregates was enhanced,and the soil structure became looser.Macroscopically,the compressibility increased and the shear strength(mainly cohesion)decreased by 28.64%.However,when the NaHCO3 content exceeded the threshold value of 1.5%,the salt gradually approached solubility and filled the pores between particles in the form of crystals,resulting in a decrease in soil porosity.The cementation effect generated by salt crystals increased the bonding force between soil particles,leading to a decrease in plasticity index and an improvement in soil mechanical properties.Moreover,this work provides valuable suggestions and theoretical guidance for the scientific utilization of carbonate saline soil in backfill engineering projects. 展开更多
关键词 Carbonate saline soil salt content Physicomechanical properties Bound water MICROSTRUCTURE
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水盐含量及电阻率对盐渍土抗剪强度的影响
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作者 苏巍 金刘彪 +1 位作者 刘鹏 何迎祥 《黑龙江科技大学学报》 CAS 2024年第1期36-39,共4页
为了研究盐渍土的水盐含量及电阻率对其抗剪强度的影响,对长岭县的盐渍土进行室内试验,测量了不同深度土壤的含水率、含盐量、电阻率和抗剪强度,研究了电阻率和抗剪强度与含水率含盐量的关系。结果表明:盐渍土的电阻率随含盐量和含水率... 为了研究盐渍土的水盐含量及电阻率对其抗剪强度的影响,对长岭县的盐渍土进行室内试验,测量了不同深度土壤的含水率、含盐量、电阻率和抗剪强度,研究了电阻率和抗剪强度与含水率含盐量的关系。结果表明:盐渍土的电阻率随含盐量和含水率的增加而逐渐降低;经三轴剪切试验可得,内摩擦角和黏聚力均随含盐量的增加而减小,与含水率呈负相关;盐渍土的抗剪强度与电阻率之间具有良好的线性关系,抗剪强度随电阻率的增大而逐渐增大,构建盐渍土抗剪强度与电阻率之间的相关拟合公式,对实际工程应用有理论参考意义。 展开更多
关键词 盐渍土 电阻率 抗剪强度 含盐量 含水率
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芡实对沿淮富营养化水体的净化效果研究
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作者 陈毛华 杨永学 刘坤 《中国农学通报》 2024年第22期66-71,共6页
为了解乡土水生植物芡实对沿淮农村富营养化河流净化效果,在模拟沿淮农村地区富营养化河流的水池中种植芡实,定期监测水体中的总氮(TN)、氨氮(NH_(4)^(+)-N)、总磷(TP)、化学需氧量(COD_(Cr))、酸碱度(pH)、可溶性盐含量(EC)、溶解氧(DO... 为了解乡土水生植物芡实对沿淮农村富营养化河流净化效果,在模拟沿淮农村地区富营养化河流的水池中种植芡实,定期监测水体中的总氮(TN)、氨氮(NH_(4)^(+)-N)、总磷(TP)、化学需氧量(COD_(Cr))、酸碱度(pH)、可溶性盐含量(EC)、溶解氧(DO)的数值变化,综合分析芡实对富营养化河流的净化效果。结果表明,芡实作为沿淮地区乡土水生植物,对富营养化的河流有着净化作用。芡实在生长过程中能吸收水体95.53%~98.45%的NH_(4)^(+)-N和99.50%~99.65%的TP,净化效果好。芡实对富营养河流中TN和COD_(Cr)的净化效果不明显,而且水体中的pH上升11.05%~11.61%,EC值增加21.12%~22%,DO增加3.82~21.77倍。芡实作为一种乡土水生植物,对沿淮地区富营养化河流具有显著的净化潜力。 展开更多
关键词 芡实 富营养化河流 水体净化 综合分析 氨氮去除 总磷去除 溶解氧增加 酸碱度变化 可溶性盐含量变化
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Prediction of Salt Tolerance in Rice (Oryza Sativa) Based on Shoot Ion Content under Non-Stressed Conditions
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作者 Souleymane Bado Brian Peter Forster +7 位作者 Roman Padilla-Alvarez Christian Resch Alessandro Migliori Yacouba Diawara Milko Jaksic Abdelbagi Mukhtar Ali Ghanim Stephen Nielen Margit Laimer 《材料科学与工程(中英文A版)》 2016年第1期1-16,共16页
关键词 水稻基因型 耐盐性 ORYZA 离子含量 应激 非遗传因素 多变量统计分析 元素含量
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库车坳陷深层盐下白垩系储集层氯盐分布模式及意义 被引量:1
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作者 罗丹婷 罗静兰 +4 位作者 邓超 年涛 韩剑发 程道解 袁龙 《新疆石油地质》 CAS CSCD 北大核心 2024年第1期1-12,共12页
库车坳陷克拉苏构造带盐下白垩系巴什基奇克组储集层分布了一批高产、稳产的天然气藏群,其储集层为超深、高温、超压致密砂岩储集层,孔隙度越高,氯盐含量越高,储集层视电阻率越低,储集层中氯盐的分布严重影响流体识别,其对盐下致密砂岩... 库车坳陷克拉苏构造带盐下白垩系巴什基奇克组储集层分布了一批高产、稳产的天然气藏群,其储集层为超深、高温、超压致密砂岩储集层,孔隙度越高,氯盐含量越高,储集层视电阻率越低,储集层中氯盐的分布严重影响流体识别,其对盐下致密砂岩物性的影响较明显。利用岩心观察、铸体薄片、扫描电镜、氯盐含量、常规测井曲线分析等,系统分析了库车坳陷盐下白垩系巴什基奇克组储集层氯盐的分布特征。根据氯盐含量、电阻率、氯盐来源等的差异,提出盐下储集层氯盐分布具有顶渗、侧渗和局部封存3种模式。顶渗模式与侧渗模式的电阻率仅受氯盐含量的影响,顶渗模式储集层氯盐含量呈垂向分带特征,随氯盐含量的降低,电阻率升高;侧渗模式储集层氯盐含量呈横向分带特征,电阻率自构造带边缘向中心表现出由高到低再升高的趋势;局部封存模式电阻率受应力和氯盐含量的共同影响,氯盐含量分布具有偶发性,电阻率变化幅度大。根据测井响应特征划分了各模式的分布段序列,顶渗模式自上而下发育盐层段、泥岩封隔段、饱和氯盐强影响段、未饱和氯盐强影响段、未饱和氯盐影响过渡段和氯盐未影响段;侧渗模式在顶渗模式基础上多发育过饱和氯盐影响段;局部封存模式从上到下划分为盐层段、泥岩封隔段、强挤压应力氯盐未影响段、氯盐应力混合影响段和氯盐应力未影响段。 展开更多
关键词 库车坳陷 深层 白垩系 盐下储集层 高温高压 氯盐含量 测井响应 氯盐分布模式
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盐分胁迫对基质栽培番茄养分吸收与生长的影响
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作者 林琼 何淽琦 朱鑫 《绿色科技》 2024年第9期75-78,191,共5页
探究了盐分胁迫对基质栽培番茄养分吸收及生长的影响,以期为番茄基质栽培营养液管理提供参考。以“德尔5号”番茄为试材,营养液设置0 mmol/L(CK)、30 mmol/L(低浓度)、60 mmol/L(中浓度)、120 mmol/L(高浓度)4个不同NaCl浓度处理,比较不... 探究了盐分胁迫对基质栽培番茄养分吸收及生长的影响,以期为番茄基质栽培营养液管理提供参考。以“德尔5号”番茄为试材,营养液设置0 mmol/L(CK)、30 mmol/L(低浓度)、60 mmol/L(中浓度)、120 mmol/L(高浓度)4个不同NaCl浓度处理,比较不同NaCl浓度处理营养液对番茄不同部位叶片氮、磷、钾、钙、镁、钠等矿质元素含量及生物量、产量的影响。结果表明:①NaCl胁迫番茄叶片K含量显著降低,Na含量显著升高,中浓度以上胁迫番茄下部叶Mg含量显著下降。试验条件下,NaCl胁迫对番茄叶片N、P、Ca含量无显著影响;②中低浓度NaCl胁迫对番茄生长影响较小,高浓度NaCl胁迫抑制番茄生长,生物量及产量均显著降低。综上,营养液含中低浓度NaCl(60 mmol/L)对番茄生长及产量影响较小,为预防番茄K、Mg缺乏,缓解盐分胁迫,可适当提高营养液配方中K、Ca、Mg比例。 展开更多
关键词 番茄 盐分胁迫 NACL 养分含量
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