Hua Fang, Yunlong Yu, Xiaoqiang Chu, Xiuguo Wang, Xiaoe Yang, Jingquan Yu
Department of Plant Protection, College of Agriculture & Biotechnology, Zhejiang University, Hangzhou 310029, China.
J Environ Sci (China). 2009;21(3):380-6. doi: 10.1016/s1001-0742(08)62280-9.
Degradation of chlorpyrifos at different concentrations in soil and its impact on soil microbial functional diversity were investigated under laboratory condition. The degradation half-live of chlorpyrifos at levels of 4, 8, and 12 mg/kg in soil were calculated to be 14.3, 16.7, and 18.0 d, respectively. The Biolog study showed that the average well color development (AWCD) in soils was significantly (P < 0.05) inhibited by chlorpyrifos within the first two weeks and thereafter recovered to a similar level as the control. A similar variation in the diversity indices (Simpson index 1/D and McIntosh index U) was observed, but no significant difference among the values of the Shannon-Wiener index H' was found in chlorpyrifos-treated soils. With an increasing chlorpyrifos concentration, the half-life of chlorpyrifos was significantly (P < or = 0.05) extended and its inhibitory effect on soil microorganisms was aggravated. It is concluded that chlorpyrifos residues in soil had a temporary or short-term inhibitory effect on soil microbial functional diversity.
在实验室条件下，研究了不同浓度毒死蜱在土壤中的降解及其对土壤微生物功能多样性的影响。计算得出土壤中毒死蜱浓度为4、8和12 mg/kg时的降解半衰期分别为14.3、16.7和18.0天。Biolog研究表明，毒死蜱在前两周显著（P < 0.05）抑制了土壤中的平均孔颜色发展（AWCD），此后恢复到与对照相似的水平。观察到多样性指数（辛普森指数1/D和麦金托什指数U）有类似变化，但在毒死蜱处理的土壤中，香农-威纳指数H'的值之间未发现显著差异。随着毒死蜱浓度的增加，毒死蜱的半衰期显著（P ≤ 0.05）延长，其对土壤微生物的抑制作用加剧。得出结论，土壤中的毒死蜱残留对土壤微生物功能多样性具有暂时或短期的抑制作用。
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