溶解性有机质对Cu在土壤中吸附-解吸行为的影响  

Effect of Dissolved Organic Matter on Sorption-Desorption Behavior of Copper in Soil

作　　者：祝亮[1] 伍钧[1] 周江敏[2] 陈华林[2] 唐东民[1] 

机构地区：[1]四川农业大学资源环境学院,四川雅安625014 [2]温州大学生命与环境科学学院,浙江温州325027

出　　处：《农业环境科学学报》2008年第5期1779-1785,共7页Journal of Agro-Environment Science

基　　金：国家自然科学基金(40501065)

摘　　要：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。The impact of dissolved organic matter derived from different decomposition stage of crop straw on the sorption-desorption behavior of soil copper （Cu） was studied. The results showed that Freundlich model could completely explain the mechanism of the soil Cu sorption and desorption. 0 day-dissolved organic matter increased the pH of sorption-desorption system, significantly decreased the hysteresis index of soil Cu, greatly reduced the sorption capacity of soil Cu, and accelerated the desorption of soil Cu. Further, there was significant difference （P〈0.01） between the 0 day phase of dissolved organic matter and other phases of dissolved organic matter. Other decomposition phases of dissolved organic matter could also increase the pH in sorption-desorption system. When soil Cu concentration was low, it decreased the hysteresis index of soil Cu, restrained the sorption of soil Cu, and accelerated the desorption of soil Cu, since the chelation effect was better than pH effect at this time. On the other hand, when soil Cu concentration was relatively high, it increased the sorption of soil Cu, reduced the desorption of soil Cu, and increased the hysteresis index of soil Cu.

关 键 词：溶解性有机质 铜 吸附 解吸 迟滞 

分 类 号：X131.3[环境科学与工程—环境科学]