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| Impacts of Dimethyl Phthalate Contamination on Respiratory Rates and Enzyme Activities in Black Soil |
| Received:January 20, 2015 |
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| KeyWord:dimethyl phthalate(DMP);black soil;soil respiration;soil enzyme;contamination |
| Author Name | Affiliation | | WANG Zhi-gang | Institute of Life Science and Agriculture and Forestry, Qiqihar University, Heilongjiang, Qiqihar 161006, China
Institute of Municipal Environment and Engineering, Harbin Industry University, Harbin 150001, China | | HU Ying | Institute of Life Science and Agriculture and Forestry, Qiqihar University, Heilongjiang, Qiqihar 161006, China | | XU Wei-hui | Institute of Life Science and Agriculture and Forestry, Qiqihar University, Heilongjiang, Qiqihar 161006, China | | MO Ji-xian | Institute of Life Science and Agriculture and Forestry, Qiqihar University, Heilongjiang, Qiqihar 161006, China | | LI Shan-shan | Institute of Life Science and Agriculture and Forestry, Qiqihar University, Heilongjiang, Qiqihar 161006, China | | ZHANG Zhi | Institute of Life Science and Agriculture and Forestry, Qiqihar University, Heilongjiang, Qiqihar 161006, China | | YANG Zhi-hong | Institute of Life Science and Agriculture and Forestry, Qiqihar University, Heilongjiang, Qiqihar 161006, China |
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| Abstract: |
| Dimethyl phthalate(DMP), one of the phthalate esters, is ubiquitous environmental pollutant in soil, and is listed as an environmental priority pollutant by China's Ministry of Environmental Protection(MEP). Black soil(Mollisols) is extremely important soil resources and mainly distributes in Northeast China. In this study, a microcosm model was set up to estimate the impacts of DMP contamination on microbial respiration and enzyme activities in black soil. Microbial respiratory rates and metabolic quotients of black soil were promoted by low DMP concentration(5 mg·kg-1), but inhibited by high DMP concentrations(10 mg·kg-1, 20 mg·kg-1 and 40 mg·kg-1). The inhibition was positively correlated with DMP concentrations. DMP inhibited catalase, but promoted invertase and urease in dose-effect manner. Activities of polyphenol oxidase and protease fluctuated during incubation course. Polyphenol oxidase activity showed initial inhibition followed by promotion; whereas protease activity displayed initial promotion followed by inhibition. Canonical correspondence analysis showed that DMP could be the key factor that alters the metabolic characteristics of black soil and impacts ecosystem functions by affecting the enzymatic properties of black soil. |
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