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作 者 ：张伟;王进军

期 刊 ：应用生态学报 2007年 18卷 03期 页码：613-619

关键词：土壤；

摘 要 ：采用平衡振荡法和土柱淋洗法，研究了溶液pH及模拟酸雨对土壤中苄嘧磺隆和甲磺隆行为的影响.结果表明，Freundlich方程能较好地描述苄嘧磺隆和甲磺隆的吸附等温线，水-土壤系统pH升高能明显地降低这两种除草剂在土壤中的吸附，促进其在土壤中的迁移，且吸附常数(K_f)与土壤有机质含量、粘土含量呈正相关，而与土壤pH呈负相关.pH值高的模拟酸雨对除草剂在土壤中淋溶贡献较大，且淋溶量随雨量的增大而增大.除草剂在土壤中的淋溶与土壤性质密切相关，有机质含量和粘粒含量较高的土壤对除草剂的持留能力较强.

Abstract:By the methods of batch equilibration and leaching, this paper studied the effects of
solution pH and simulated acid rain on the behavior of bensulfur on-methyl and metsulfuron-methyl
in soil. The results showed that the adsorption isotherms of these two herbicides fitted Freundlich
equation well, and their adsorbed amounts reduced obviously with the increasing pH of water-soil
system, which in turn promoted the translocation of the herbicides in soil. The adsorption coefficient
(K_f) was positively correlated with soil organic matter and clay contents, while negatively correlated
with soil pH. The higher pH of simulated acid rain had a greater contribution on the leaching of the
two sulfonylurea herbicides, and their leached amount was increased with increasing acid rain. There
was a close relationship between the leaching of the herbicides and the properties of soil. The soils
with higher contents of organic matter and clay had a greater retention capability to the herbicides.

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