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[目的]系统研究磺酰磺隆在土壤中的主要环境行为:土壤降解、土壤表面光降解、在土壤中的吸附性和移动性等。[结果]磺酰磺隆在土壤中的吸附为物理吸附,吸附常数(Kd)为江西红壤3.05,太湖水稻土1.63和东北黑土1.15;江西红壤属中等移动,太湖水稻土和东北黑土均属可移动等级;土壤中的降解半衰期为14.5~42.5 d;土壤表面光解半衰期为22.6 h,在土壤表面为难光解农药。[结论]通过系统研究磺酰磺隆土壤环境行为,为该类除草剂的合理使用及生态修复提供了理论基础。
[Objective] The research aimed to systematically study the main environmental behaviors of sulfosulfuron in soil: soil degradation, photodegradation of soil surface, adsorption and mobility in soil. [Result] The adsorption of sulfosulfuron in the soil was physical adsorption. The adsorption constants (Kd) were 3.03 in Jiangxi red soil, 1.63 in Taihu paddy soil and 1.15 in Northeast China. The red soil in Jiangxi Province was moderately moving, Moving grade. The half-life of degradation in soil was 14.5-42.5 d. The half-life of photolysis on soil surface was 22.6 h, which was hard to photoperiod pesticides on the soil surface. [Conclusion] The systematic study of sulfosulfuron soil environmental behavior provided the theoretical basis for the rational use and ecological restoration of these herbicides.