Impacts of petroleum-containing wastewater irrigation on microbial population and enzyme activities in paddy soil of Shenfu irrigation area

Abstract

Abstract: The study showed that the upper reaches of main petroleum-containing wastewater irrigation channels had the highest accumulation and distribution of total petroleum hydrocarbon (TPH) (5 213.37 mg穔g^-1 dry soil),and the CFU of soil bacteria and fungi was increased with increasing soil TPH concentration,the correlation coefficient being 0.928 (P<0.001) and 0.772 (P<0.05),respectively.The activities of soil dehydrogenase,catalase and polyphenoloxidase had a significantly positive correlation with soil TPH concentration,their correlation coefficient being 0.974 (P<0.001),0.957 (P<0.001) and 0.886 (P<0.001),respectively,while soil urease activity showed a significantly negative correlation (P=0.002),which could be used as the most sensitive indicator of petroleum contamination.The substrate-induced respiration (SIR) of polluted soil was significantly correlated with soil TPH concentration (P<0.001),dehydrogenase activity (P<0.001),and heterotrophic bacterial CFU (P=0.006).

Key words: Petroleum hydrocarbon contamination, Wastewater irrigation, Paddy soil, Microbial population, Soil enzyme activity

CLC Number:

X172

LI Hui, CHEN Guanxiong, YANG Tao, ZHANG Chenggang . Impacts of petroleum-containing wastewater irrigation on microbial population and enzyme activities in paddy soil of Shenfu irrigation area[J]. Chinese Journal of Applied Ecology, 2005, 16(7): 1355-1359.

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