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| Responses of Microbial Community Functional Diversity to Bensulfuron-methyl in Paddy Soil |
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| KeyWord:bensulfuron-methyl; microbial community; BIOLOG; functional diversity; paddy soil |
| Author Name | Affiliation | | ZHANG Wen-wen | College of Agriculture, Northeast Agricultural University, Harbin 150030, China
State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China | | XU Jun | State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China | | DONG Feng-shou | State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China | | LIU Xin-gang | State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China | | XIANG Wen-sheng | College of Agriculture, Northeast Agricultural University, Harbin 150030, China | | ZHENG Yong-quan | State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China |
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| Abstract: |
| A laboratory incubation study was conducted to ascertain the effects of bensulfuron-methyl on soil microbial community functional diversity in a paddy soil. Bensulfuron-methyl was applied to soil at three rates：0（control）, 0.4 mg·kg-1 dry weight soil（the maximum recommended field rate） and 4 mg·kg-1 dry weight soil（ten-fold of the maximum recommended field rate）. Soil microbial community functional diversity indexes with potential as bioindicators of soil health were measured using BIOLOG Ecoplates at different times after herbicide application. The average well color development（AWCD） indicated that the carbon source substrates utilization ability of microbial communities were enhanced at low application rates but inhibited at high application rates. However, bensulfuron-methyl did not show significant difference from the control soils as exposure time increased. At 96 h, Shannon index, Simpson index and McIntosh index showed that bensulfuron-methyl significantly decreased utilization ability and efficiency of carbon substrates, and number of utilizable carbon substrate species by the microbial communities. Principal component analysis（PCA） indicated the soil microbial community structure was shifted by bensulfuron-methyl application, but recovered at the end of experiment. These results suggest that bensulfuron-methyl application shifts the soil microbial community structure and function, but they tend to recover as time extends. |
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