期刊
出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/03601230802599035
关键词
Biolog; butachlor; herbicide; microbial diversity; soil
资金
- National High Technology Research and Development Program of China [2006AA06Z386, 2007AA06Z306]
- China Postdoctoral Science Foundation [20070421174]
- National Natural Science Foundation of China [30771254]
- Zhejiang Provincial Natural Science Foundation [Z306260]
- National Key Technology R & D Program of China [2006BAI09B03]
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.
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