碘甲磺隆钠在土壤中的降解动态研究

采用室内模拟试验方法,研究了不同环境条件下碘甲磺隆钠盐在土壤中的降解动态。结果表明,碘甲磺隆钠盐在土壤中的降解以微生物降解为主,化学降解和光降解为辅,其降解速率与土壤含水量呈正相关,与pH值呈负相关,碘甲磺隆钠盐在红壤中降解最快,在河潮土中降解最慢,在紫泥土中介于两者之间。

Degradation Dynamics of Iodosulfuron-methyl-sodium in Soils

The degradation trends of iodosulfron-methyl-sodium were studied under various environment conditions by stimulating methods in laboratory. The results showed that iodosulfuron-methyl-sodium was mainly degraded by soil microorganisms in soil, the chemical and photo degradation were subsidiary. The degradation rate of iodosulfuron-methyl-sodium showed a positive correlation with soil moisture content but a negative correlation with soil pH. The higher of soil moisture content, the faster degradation of iodosulfuron-methyl-sodium; the higher of soil pH, the slower degradation of iodosulfuron-methyl-sodium. The dissipation rate of iodosulfuron-methyl-sodium was fastest in red soil, lowest in river tidal soil, and intermediate in purple soil.