脱硫石膏施用下宁夏盐化碱土水盐运移特征

发布时间：2019-07-18 09:07

【摘要】：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—20cm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—80cm土层。脱硫石膏施用下,0—20cm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,SO_4~(2-)溶脱率低于Na~+和Cl~-,高淋洗水量下,3种离子溶脱率接近;20—40cm土层主要盐分离子溶脱率由大到小依次为Cl~-、SO_4~(2-)、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60cm时,SO_4~(2-)和Na~+在80—100cm土层累积,Cl~-则运移至100cm土层以下。
[Abstract]:In order to quantitatively describe the relationship between salt content and leaching water quantity of salinized alkali soil under desulphurization gypsum application, the effect of different leaching amount of desulphurization gypsum on water and salt transport of salinized alkali soil in Ningxia was studied by indoor soil column leaching test. The results showed that the application of desulphurization gypsum had a positive effect on increasing water infiltration and reducing pH, salt content in 0-20cm soil layer. Soil desalination rate was 84.39% 鈮，

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