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| Effects of low-concentration herbicides on the diversity and community composition of plant and soil nematodes in fallow land |
| Received:May 29, 2020 |
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| KeyWord:atrazine;tribenuron-methyl;fallow land;plants;soil nematode;community diversity |
| Author Name | Affiliation | E-mail | | QI Yue | Institute of Ecology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | YAN Bing | Institute of Energy, Jiangxi Academy of Science, Nanchang 330096, China | | | GUAN Xiao | Institute of Ecology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | CHEN Fa-jun | Department of Entomology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China | | | XIAO Neng-wen | Institute of Ecology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | FU Gang | Institute of Ecology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | LI Jun-sheng | Institute of Ecology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | lijsh@craes.org.cn |
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| Abstract: |
| The ecological risks of low concentrations of herbicides in agroecosystems are worthy of attention. In this study, fallow land in northern China was selected as the study sample, and the field random block design was adopted to compare the community characteristics of plant and soil nematodes after the spraying of atrazine at 1 200, 600, and 300 g·hm-2(active components) or tribenuron-methyl at 22.5, 11.25, and 5.63 g·hm-2(active components) for 30 d. The results showed that the different doses of atrazine and tribenuron-methyl changed the species composition of plant communities and significantly reduced the diversity and richness indices of plant communities but did not significantly change the evenness index of plant communities in the fallow land. Compared with the blank control, the different doses of atrazine and tribenuron-methyl changed the soil nematode community composition and the rare genera, as well as reduced the number of rare genera present. However, it did not significantly change the community, life history, or nutrient group diversity indices of the soil nematodes. There were no significant differences in the effects of atrazine or tribenuron-methyl with less than the recommended field application concentration and the recommended field application concentration on the plant communities. Different concentrations of herbicides increased soil environmental stress in the fallow land. The results suggest that the ecological risks of low concentrations of herbicides should not be ignored in the development of practical biodiversity conservation strategies in agroecosystems. |
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