Differences in loam water retention and shrinkage behavior: Effects of various types and concentrations of salt ions

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• 作者：Xuguang Xing^a ; ^b ; ^{xg_xing@yeah.net} ; Duan&rsquo ; gang Kang^a ; ^b ; Xiaoyi Ma^a ; ^b ; ^{xiaoyima@vip.sina.com}
• 关键词：SWCC ; soil water characteristic curve ; CL/CA/CP/CLD/CAD ; crack length/crack area/crack aperture/crack length density/crack area density ; TP/TN ; treatment saturated by positive/negative salt ion ; TK/TNa/TCa/TMg/TCl/THCO3/TCO3/TSO4 ; treatment saturated by K+/Na+/Ca2+/Mg2+/Cl&minus ; /HCO3&minus ; /CO32&minus ; /SO42&minus
• 刊名：Soil and Tillage Research
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：167
• 期：Complete
• 页码：61-72
• 全文大小：2752 K
• 卷排序：167

文摘

Combination of soil shrinkage and dehydration. K+, Na+, Ca2+ and Mg2+, and HCO3− and CO32−always drop and raise water retention. Mg2+ always raises crack length and area; other salt ions always reduce them. K2CO3 is a useful additive for increasing water retention and decreasing cracks. Van-Genuchten model is valid for fitting water retention curves of soils saturated with salt solutions.