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溶解性有机质对Cu在土壤中吸附-解吸行为的影响

Keywords: 溶解性有机质,,吸附,解吸,迟滞

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Abstract:

通过室内实验研究了水稻秸秆不同腐解阶段产生的溶解性有机质(DOM)对Cu在黄筋泥(水稻土)中吸附-解吸行为的影响。结果表明,Freundlich方程能很好地描述Cu在土壤中的吸附解吸行为。加入0d-DOM能增大吸附和解吸体系中的pH值,明显降低Cu在土壤中的迟滞系数,抑制Cu在黄筋泥(水稻土)上的吸附、促进其解吸,且与对照和其他几个阶段DOM的影响存在极显著差异(P<0.01)。加入其他腐解阶段的DOM也能增大吸附和解吸体系中的pH。在Cu浓度较低时降低迟滞系数,抑制吸附,促进解吸;高浓度时增加迟滞系数,促进吸附,抑制解吸。

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