Persistence of the herbicide butachlor in soil after repeated applications and its effects on soil microbial functional diversity
Persistence of the herbicide butachlor in soil after repeated applications and its effects on soil microbial functional diversity
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DOI：
10.1080/03601230802599035
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发表时间：
2009-01
期刊：
影响因子：
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通讯作者：
H. Fang;Y. Yu;Xiuguo Wang;X. Chu;Xiao E. Yang
中科院分区：
文献类型：
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作者：
H. Fang;Y. Yu;Xiuguo Wang;X. Chu;Xiao E. Yang
在实验室条件下，研究了除草剂丁草胺（N-（丁氧基甲基）-2-氯-N-2′，6 ′-二甲基乙酰苯胺）在土壤中重复施用对其持效性和土壤微生物功能多样性的影响。丁草胺在推荐剂量下，第一次、第二次和第三次施用时在土壤中的降解半衰期分别为12.5、4.5和3.2天。在整个研究中，未观察到Shannon-Wiener指数H′的显著抑制。丁草胺处理后3 d内，土壤Simpson指数1/D和McIntosh指数U显著降低（P ≤ 0. 05），此后逐渐恢复到与对照土壤相似的水平。在第二次和第三次施用丁草胺后，观察到1/D和U的类似变化，但恢复更快。因此，反复施用丁草胺导致除草剂更快降解，土壤微生物更快恢复。结果表明，丁草胺的重复施用对土壤微生物群落具有暂时或短期的抑制作用。
Effects of repeated applications of the herbicide butachlor (N-(butoxymethyl)-2-chloro -N-2′,6′-dimethyl acetanilide) in soil on its persistence and soil microbial functional diversity were investigated under laboratory conditions. The degradation half-lives of butachlor at the recommended dosage in soil were calculated to be 12.5, 4.5, and 3.2 days for the first, second, and third applications, respectively. Throughout this study, no significant inhibition of the Shannon-Wiener index H′ was observed. However, the Simpson index 1/D and McIntosh index U were significantly reduced (P ≤ 0.05) during the initial 3 days after the first application of butachlor, and thereafter gradually recovered to a similar level to that of the control soil. A similar variation but faster recovery in 1/D and U was observed after the second and third Butachlor applications. Therefore, repeated applications of butachlor led to more rapid degradation of the herbicide, and more rapid recovery of soil microorganisms. It is concluded that repeated butachlor applications in soil had a temporary or short-term inhibitory effect on soil microbial communities.