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| Effects of Combined Pollution of Perchlorate and Hexavalent Chromium on Soil Enzyme Activities and Microbial Population |
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| KeyWord:chromium; perchlorate; soil enzyme activity; soil microbial population |
| Author Name | Affiliation | | DUAN Xiong-wei | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University
Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, Guangzhou 510642, China | | LIU Ya-ling | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University
Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, Guangzhou 510642, China | | LI Hua-shou | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University
Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, Guangzhou 510642, China | | HE Hong-zhi | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University
Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, Guangzhou 510642, China | | CHEN Gui-kui | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University
Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, Guangzhou 510642, China |
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| Abstract: |
| Perchlorate and hexavalent chromium often enter soil via irrigation. A simulated control experiment was conducted to study the joint effects of perchlorate and hexavalent chromium on soil enzyme activities and microbial population over time. At the early stage of the experiment, polyphenol oxidase activity was found to increase significantly with increasing concentrations of perchlorate and/or chromium. Catalase activity was not affected by perchlorate alone, but significantly decreased by hexavalent chromium at medium or high concentrations and combined perchlorate and hexavalent chromium（P<0.05）. Urease activity was promoted at low but inhibited at high concentrations. Invertase activity was enhanced significantly by perchlorate during the first 2 days, but was reduced by perchlorate, hexavalent chromium or their combinations at the 8th day. However, the activities of four soil enzymes were all restored to the initial levels at the 30th day. During the experiment, soil fungi population reduced significantly in single and combined treatments of perchlorate and chromium. The population of bacteria and actinomycete decreased significantly under high concentrations at the early stage of the experiment, but were all back to the control levels at the 30th day. The bacteria were tolerant to perchlorate and chromium and became dominant species, causing enzyme activities return to the control levels. The results indicate that bacteria and actinomycete play a crucial role in bioremediation of these two pollutants. |
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