脱硫石膏施用下宁夏盐化碱土水盐运移特征
wf(2017)
Abstract
为定量描述脱硫石膏施用下盐化碱土土壤剖面盐分与淋洗水量的关系,通过室内土柱淋洗试验开展了脱硫石膏施用下不同淋洗水量对宁夏盐化碱土水盐运移影响的研究.结果表明:施用脱硫石膏对增加水分入渗和降低0-20 cm土层土壤pH、盐分含量产生了积极影响,土壤脱盐率84.39%~95.41%,但较大水量的淋洗有可能会加剧土壤碱化.连续淋洗条件下,最大脱盐深度位于60-80 cm土层.脱硫石膏施用下,0-20 cm土层Cl-、Na+溶脱率随淋洗水量的增加变化不大,低淋洗水量下,SO42-溶脱率低于Na+和Cl-,高淋洗水量下,3种离子溶脱率接近;20-40 cm土层主要盐分离子溶脱率由大到小依次为Cl-、SO42-、Na+,各离子脱盐率随淋洗水量的增加先增加较快后趋于平缓.当淋洗水量达到60 cm时,SO42-和Na+在80-100 cm土层累积,Cl则运移至100 cm土层以下.
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Key words
soil column leaching test,desulfurized gypsum,leaching water volume,saline alkali soil,water and salt movement
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