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The effects of different halogenated-pyrethroid pesticides on soil microbial community
Binghai Lv1, Zhenyan Zhang2, Bingfeng Chen1
1College of Environment, Zhejiang University of Technology, Hangzhou 310032, PR China.
Abstract:
The application of pesticides increases crop yields but affects the structure and function of the soil microbial community. Halogens are common functional modification groups in chemical compounds, and innovative pesticides have been developed on the basis of these groups. However, the effects of different halogen substituents on soil microorganisms remain unclear. This study investigated the effects of three pyrethroid pesticides (deltamethrin, cypermethrin, and cyfluthrin) on the soil microbiota. Our results revealed that all these pesticides significantly reduced the stability of the bacterial communities and decreased bacterial diversity at high concentrations. Compared with deltamethrin (Br-) and cypermethrin (Cl-), low concentrations (0.5 mg/kg) of cyfluthrin (F-) increased soil bacterial diversity by 23.14 % and increased the potential for nitrogen fixation by 2.00 % and nitrification by 3.39 %, thus making it a relatively eco-friendly option. Our findings provide new insights into the potential ecological effects of halogenated pyrethroid pesticides on soil ecosystems.
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