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
A relationship between electrical conductivity (EC) and total dissolved solids (TDS) was tested for solutions of same salinity levels with respect to different artificial salts with their combinations. Results showed ...A relationship between electrical conductivity (EC) and total dissolved solids (TDS) was tested for solutions of same salinity levels with respect to different artificial salts with their combinations. Results showed remarkable jumping at the order of the artificial salt sequence specially that of the magnesium type. A computer model is designed with an input of EC and TDS. The output will be the possible prevailing artificial salts. The accuracy of the model was tested by using the groundwater data of Safwan-Zubair area south of Iraq and it proved to be significant at 95% matching. The 5% unmatched results are due to the possibility of having more than one type of prevailing salt.展开更多
[目的]探讨规模化奶牛场不同处理工艺下污水的盐分特征规律,以期为粪污资源化利用提供理论依据。[方法]分别采集河北省17家奶牛场挤奶厅、尿液和固液分离后等经典型工艺处理的污水,测定Cl^(-)、SO_(4)^(2-)、Na^(+)、K^(+)、Ca^(2+)含...[目的]探讨规模化奶牛场不同处理工艺下污水的盐分特征规律,以期为粪污资源化利用提供理论依据。[方法]分别采集河北省17家奶牛场挤奶厅、尿液和固液分离后等经典型工艺处理的污水,测定Cl^(-)、SO_(4)^(2-)、Na^(+)、K^(+)、Ca^(2+)含量及全盐量和电导率,分析电导率与盐分离子间的相关性。[结果]奶牛场尿液中无机盐组分以Cl^(-)、SO_(4)^(2-)、Na^(+)、K^(+)为主,且随着处理工艺的推进,固液分离后无机盐含量逐渐降低,而挤奶厅污水中盐分含量总体上较低,仅Cl^(-)含量略高(436 mg/L);污水中各阶段的全盐量和电导率存在显著差异,且尿液的全盐量和电导率均显著高于挤奶厅和固液分离后的全盐量和电导率,分别为52.2 g/L、23.3 m S/cm;相关性分析表明,全盐量与电导率、Cl^(-)、SO_(4)^(2-)、Na^(+)、K^(+)均呈极显著正相关,相关性最弱的离子是Ca^(2+)。[结论]规模化奶牛场污水中尿液无机盐离子和全盐量最高,固液分离后的次之,挤奶厅的最低,且电导率、Cl^(-)、SO_(4)^(2-)、Na^(+)、K^(+)可表征研究污水盐度的特征因子。展开更多
Objective:To investigate the antihyperlipidemic effect of crude ethanolic extract of Melothria maderaspatana(M.maderaspatana) leaf(CEEM) on deoxycorticosterone acetate(DOCA)-salt hypertensive rats.Methods:A midscapula...Objective:To investigate the antihyperlipidemic effect of crude ethanolic extract of Melothria maderaspatana(M.maderaspatana) leaf(CEEM) on deoxycorticosterone acetate(DOCA)-salt hypertensive rats.Methods:A midscapular incision was made on each rat and the left kidney was excised after ligation of the renal artery.The surgical wound was closed using an absorbable suture.After one week recovery period,hypertension was induced by subcutaneous injection of DOCA-salt solution,twice a week,and the rats received a 1%sodium chloride solution as drinking water throughout the experimental period.CEEM or nifedipine was administered orally once a day for 6 weeks.Results:In DOCA-salt hypertensive rats,the level of plasma and tissues of total cholesterol(TC),triglycerides(TG),free fatty acids(FFA) and phospholipids (PL) significantly increased and administration of CEEM significantly reduced these parameters towards normality.Further,the levels of low density lipoprotein-cholesterol(LDL-C) and very low density lipoprotein-cholesterol(VLDL-C) significantly increased while high density lipoprotein-cholesterol (HDL-C) decreased in hypertensive rats and administration of CEEM brought these parameters to normality which proved their antihyperlipidemic action.Histopathology of liver, kidney and heart on DOCA-salt induced rats treated with CEEM showed reduced the damages towards normal histology.Conclusions:These findings provided evidence that CEEM was found to be protecting the liver,kidney and heart against DOCA-salt administration and the protective effect could attribute to its antihyperlipidemic activities.展开更多
基金Under the auspices of National Key Research and Development Program of China(No.2022YFD1500501)National Natural Science Foundation of China(No.41971066)+1 种基金Key Laboratory Foundation of Mollisols Agroecology(No.2020ZKHT-03)High Tech Fund Project of S&T Cooperation Between Jilin Province and Chinese Academy of Sciences(No.2022SYHZ0018)。
文摘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.
文摘A relationship between electrical conductivity (EC) and total dissolved solids (TDS) was tested for solutions of same salinity levels with respect to different artificial salts with their combinations. Results showed remarkable jumping at the order of the artificial salt sequence specially that of the magnesium type. A computer model is designed with an input of EC and TDS. The output will be the possible prevailing artificial salts. The accuracy of the model was tested by using the groundwater data of Safwan-Zubair area south of Iraq and it proved to be significant at 95% matching. The 5% unmatched results are due to the possibility of having more than one type of prevailing salt.
文摘[目的]探讨规模化奶牛场不同处理工艺下污水的盐分特征规律,以期为粪污资源化利用提供理论依据。[方法]分别采集河北省17家奶牛场挤奶厅、尿液和固液分离后等经典型工艺处理的污水,测定Cl^(-)、SO_(4)^(2-)、Na^(+)、K^(+)、Ca^(2+)含量及全盐量和电导率,分析电导率与盐分离子间的相关性。[结果]奶牛场尿液中无机盐组分以Cl^(-)、SO_(4)^(2-)、Na^(+)、K^(+)为主,且随着处理工艺的推进,固液分离后无机盐含量逐渐降低,而挤奶厅污水中盐分含量总体上较低,仅Cl^(-)含量略高(436 mg/L);污水中各阶段的全盐量和电导率存在显著差异,且尿液的全盐量和电导率均显著高于挤奶厅和固液分离后的全盐量和电导率,分别为52.2 g/L、23.3 m S/cm;相关性分析表明,全盐量与电导率、Cl^(-)、SO_(4)^(2-)、Na^(+)、K^(+)均呈极显著正相关,相关性最弱的离子是Ca^(2+)。[结论]规模化奶牛场污水中尿液无机盐离子和全盐量最高,固液分离后的次之,挤奶厅的最低,且电导率、Cl^(-)、SO_(4)^(2-)、Na^(+)、K^(+)可表征研究污水盐度的特征因子。
基金financially supported by UGC-SAP Merit sholarship from the university grants connission
文摘Objective:To investigate the antihyperlipidemic effect of crude ethanolic extract of Melothria maderaspatana(M.maderaspatana) leaf(CEEM) on deoxycorticosterone acetate(DOCA)-salt hypertensive rats.Methods:A midscapular incision was made on each rat and the left kidney was excised after ligation of the renal artery.The surgical wound was closed using an absorbable suture.After one week recovery period,hypertension was induced by subcutaneous injection of DOCA-salt solution,twice a week,and the rats received a 1%sodium chloride solution as drinking water throughout the experimental period.CEEM or nifedipine was administered orally once a day for 6 weeks.Results:In DOCA-salt hypertensive rats,the level of plasma and tissues of total cholesterol(TC),triglycerides(TG),free fatty acids(FFA) and phospholipids (PL) significantly increased and administration of CEEM significantly reduced these parameters towards normality.Further,the levels of low density lipoprotein-cholesterol(LDL-C) and very low density lipoprotein-cholesterol(VLDL-C) significantly increased while high density lipoprotein-cholesterol (HDL-C) decreased in hypertensive rats and administration of CEEM brought these parameters to normality which proved their antihyperlipidemic action.Histopathology of liver, kidney and heart on DOCA-salt induced rats treated with CEEM showed reduced the damages towards normal histology.Conclusions:These findings provided evidence that CEEM was found to be protecting the liver,kidney and heart against DOCA-salt administration and the protective effect could attribute to its antihyperlipidemic activities.
