三唑酰草胺在不同类型土壤中的降解特性

为科学评价除草剂三唑酰草胺在土壤环境中的生态风险，采用室内模拟方法，研究了三唑酰草胺在吉林黑土、江西红土和安徽水稻土中的降解特性。结果表明:三唑酰草胺在土壤中的降解符合一级动力学方程。好氧条件下三唑酰草胺在3种土壤中的降解半衰期分别为86.5、106和91.4 d；厌氧条件下半衰期分别为106、130和127 d；水稻田厌氧条件下半衰期分别为162、219和188 d。研究表明，三唑酰草胺在水稻田厌氧条件下的降解速率明显慢于其他2种试验条件下。

Degradation characteristic of ipfencarbazone in different types of soil

In order to evaluate the ecological risk of herbicide ipfencarbazone in soil environments, the degradation characteristic of ipfencarbazone was studied using indoor simulation method in three typical soil types, including black soil from Jiling Province, red soil from Jiangxi Province and paddy soil from Anhui Province. The results showed that the degradation of ipfencarbazone in three different soils conformed to the first kinetic equation．The half-lives of ipfencarbazone were 86.5, 106 and 91.4 d in black soil, red soil and paddy soil, respectively, under aerobic condition. While the half-lives were 106, 130 and 127 d, respectively, under anaerobic conditions. And the half-lives were 162, 219 and 188 d, respectively, under anaerobic conditions in paddy fields. Research showed that the degradation rate of ipfencarbazone under anaerobic conditions in paddy fields was obviously slower than other two test conditions.