七种农药在3种不同类型土壤中的吸附及淋溶特性

采用振荡平衡法和土柱淋溶法研究了2,4-滴酸、丁噻隆、毒草胺、炔草酸、氟环唑、甲基磺草酮和烯啶虫胺7种农药在江西红壤、太湖水稻土及东北黑土3种不同理化性质土壤中的吸附及淋溶特性,探讨了农药性质及土壤理化性质对供试农药在土壤中吸附、淋溶行为的影响。结果表明:农药的水溶性越大,其在土壤中的吸附性越弱,淋溶性越强;农药在土壤中的吸附性与土壤pH值、有机质含量以及阳离子交换量之间有较好的相关性。土壤pH值、有机质含量以及农药性质是影响农药在土壤中淋溶及迁移的主要因素。

Adsorption and leaching behavior of seven pesticides in three different soils

To study the influence of pesticide character,soil basic physical and chemical properties on the adsorption and leaching behavior of pesticide in soil,the adsorption and leaching of seven pesticides onto three different soils including Northeast China black soil,Taihu paddy soil,Jiangxi red soil were conducted by oscillation equilibrium experiment and column leaching.The results showed the greater of the pesticide water-soluble,the weaker adsorption and stronger leaching.The values of K_f were well correlated to certain physical-chemical properties of the soils such as organic matter contents,cation exchange capacity and pH.Properties of the soils including organic matter contents,pH and physico-chemical properties of pesticides may affect the leaching migration of pesticides in soil.