Arid
DOI10.1002/jpln.200800075
Suitability of a hydraulic-conductivity model for predicting salt effects on swelling soils
Chaudhari, Suresh K.1; Singh, Ravender2; Kumar, Ashwani3
通讯作者Chaudhari, Suresh K.
来源期刊JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE
ISSN1436-8730
出版年2010
卷号173期号:3页码:360-367
英文摘要

Many empirical approaches have been developed to analyze changes in hydraulic conductivity due to concentration and composition of equilibrium solution. However, in swelling soils these approaches fail to perform satisfactorily, mainly due to the complex nature of clay minerals and soil-water interactions. The present study describes the changes in hydraulic conductivity of clay (Typic Haplustert) and clay-loam (Vertic Haplustept) soils with change in electrolyte concentration (TEC) and sodium-adsorption ratio (SAR) of equilibrium solution and assesses the suitability of a model developed by Russo and Bresler (1977) to describe the effects of mixed Na-Ca-Mg solutions on hydraulic conductivity. Four solutions encompassing two TEC levels viz., 5 and 50 mmol(c) L(-1) and two SAR levels viz., 2.5 and 30 mmol(1/2) L(-1/2) were synthesized to equilibrate the soil samples using pure chloride salts of Ca, Mg, and Na at Ca : Mg = 2:1. Diluting 50 mmol(c) L(-1) solution to 5 mmolc L(-1) reduced saturated hydraulic conductivity of both soils by 66%, and increasing SAR from 2.5 to 30 mmol(1/2) L(-1/2) decreased saturated hydraulic conductivity by 82% and 79% in clay and clay-loam soils, respectively. Near saturation, the magnitude of the change in unsaturated hydraulic conductivity due to the change in TEC and SAR was of 10(3-) and 10(2)-fold, and at volumetric water content of 0.20 cm(3) cm(-3), it was of 10(14)- and 10(6)-fold in clay and clay-loam soils, respectively. Differences between experimental and predicted values of saturated hydraulic conductivity ranged between 0.6% and 11% in clay and between 0.06% and 2.1% in clay-loam soils. Difference between experimental and predicted values of unsaturated hydraulic conductivity widened with drying in both soils. Predicted values were in good agreement with the experimental values of hydraulic conductivity in clay and clay-loam soils with R(2) values of 0.98 and 0.94, respectively. The model can be satisfactorily used to describe salt effects on hydraulic conductivity of swelling soils in arid and semiarid areas, where groundwater quality is poor.


英文关键词electrolyte concentration sodium-adsorption ratio saturated hydraulic conductivity unsaturated hydraulic conductivity swelling soil
类型Article
语种英语
国家India
收录类别SCI-E
WOS记录号WOS:000279437100006
WOS关键词INTERACTING DIFFUSE LAYERS ; EXCHANGEABLE SODIUM ; SIZE DISTRIBUTION ; WATER-QUALITY ; IONIC SYSTEMS ; CALCIUM
WOS类目Agronomy ; Plant Sciences ; Soil Science
WOS研究方向Agriculture ; Plant Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/165414
作者单位1.Cent Soil Salin Res Inst, Karnal 132001, Haryana, India;
2.Indian Agr Res Inst, New Delhi 110012, India;
3.Directorate Water Management, Bhubaneswar 751023, Orissa, India
推荐引用方式
GB/T 7714
Chaudhari, Suresh K.,Singh, Ravender,Kumar, Ashwani. Suitability of a hydraulic-conductivity model for predicting salt effects on swelling soils[J],2010,173(3):360-367.
APA Chaudhari, Suresh K.,Singh, Ravender,&Kumar, Ashwani.(2010).Suitability of a hydraulic-conductivity model for predicting salt effects on swelling soils.JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE,173(3),360-367.
MLA Chaudhari, Suresh K.,et al."Suitability of a hydraulic-conductivity model for predicting salt effects on swelling soils".JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE 173.3(2010):360-367.
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