溶解性有机质对苄嘧磺隆在土壤中吸附解吸行为的影响  

Effect of Dissolved Organic Matter on Sorption-desorption Behavior of Bensulfuron-methyl in Soil

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

机构地区：[1]四川农业大学资源与环境学院,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1716-1720,共5页Journal of Agro-Environment Science

基　　金：国家自然科学基金(40501065)

摘　　要：采用吸附-解吸实验方法,研究了水稻秸秆不同腐解阶段产生的溶解性有机质(DOM)对苄嘧磺隆(BSM)在土壤中吸附-解吸行为的影响。结果表明,Freundlich方程能很好的描述BSM在土壤的吸附解吸行为。在本实验所研究的BSM和DOM浓度范围内,加入DOM后抑制了土壤对BSM的吸附,不同DOM所产生的抑制效应存在显著差异,与对照(不加DOM)相比,其抑制效应达到极显著水平(P<0.01),随着秸秆腐解时间的延长,DOM的抑制作用越来越小。BSM在土壤中存在解吸迟滞现象,但加入DOM后迟滞现象明显减弱,促进了BSM在土壤中的解吸。The effect of dissolved organic matter （DOM）derived from various stages of crop straw decomposition on the sorption-desorption behavior of Bensulfuron-methyl（BSM ）in soil had been studied. The results showed that（i）The Freundlieh model can completely explained the mechanism of BSM sorption and desorption; （ii）Within the selected concentration range of the BSM and DOM in this study, the sorption capacity of soil BSM reduced significantly after applying DOM into soil,which derived from different decomposing stages.Fuetheremore, there is significant difference（P〈0.01 ）comparing to control treatment（i.e., no DOM in eorption-desorption course ）.The effect of DOM on the sorption capacity of soil BSM was weakened with longer DOM compositon time; （iii）By ealeulation the hysteresis index （HI）value, it was found that the sorption-desorption hystersis of soil was statistically significant comparing with control treatment, but HI value was much lower and was not statistieaJly significant comparing with control treatment after adding DOM.The DOM accelerated desorption of soil BSM. This research was important to direct the reasonable application of organic fertilizer.

关 键 词：溶解性有机质 苄嘧磺隆 吸附 解吸 迟滞 

分 类 号：X592[环境科学与工程—环境工程]