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| Effects of Salt and Emamectin Benzoate-Chlorpyrifos Mix on Ecological Characteristics of Microorganisms in Vegetable Soil |
| Received:April 30, 2015 |
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| KeyWord:salt stress;emamectin benzoate-chlorpyrifos mix;soil microbe;soil enzyme activity;orthogonal experimental design |
| Author Name | Affiliation | E-mail | | YUAN Min | Tianjin Academy of Environmental Science, Tianjin 300191, China | | | TANG Mei-zhen | Key Laboratory of Nasihu Lake Wetland Ecosystem & Environment Protection, Qufu Normal University, Shandong, Qufu 273165, China | tmzh0816@163.com | | LUO Yan-he | Tianjin Academy of Environmental Science, Tianjin 300191, China | | | CHANG Wen-tao | Tianjin Academy of Environmental Science, Tianjin 300191, China | | | YAN Pei | Tianjin Academy of Environmental Science, Tianjin 300191, China | | | SONG Bing-kui | Tianjin Academy of Environmental Science, Tianjin 300191, China | | | XING Zhi-jie | Tianjin Academy of Environmental Science, Tianjin 300191, China | | | ZHAO Jing-lei | Tianjin Academy of Environmental Science, Tianjin 300191, China | | | LIAO Guang-long | Tianjin Academy of Environmental Science, Tianjin 300191, China | |
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| Abstract: |
| Soil microorganisms and enzyme activities are important indicators of soil ecosystem responses to environmental stresses. The impacts of salt and emamectin benzoate-chlorpyrifos mix on soil enzyme activities and microorganism population in a vegetable soil was examined using the orthogonal experimental design and pot culture. Results showed that the activities of soil urease, sucrase, dehydrogenase and catalase were inhibited in varying degrees by salt and emamectin benzoate-chlorpyrifos mix in a dose-effect mode. Similarly, the populations of soil bacteria, fungi, and actinomycetes decreased with increasing stresses. As time passed, the pesticide degraded gradually, thus reducing its toxicity and restoring the soil microbes to the control level. However, soil enzyme activities and microorganism quantities were inhibited all the time under co-existence of salt and pesticide. These results suggest that salt stress is the controlling factor of soil enzyme activity and microorganism inhibition by pesticides. |
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