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

LI Hui 1,2,CHEN Guanxiong 1,3,YANG Tao 1,4,ZHANG Chenggang 1   

  1. 1Key Laboratory of Terrestrial Ecological Processes,Institute of Applied
    Ecology,Chinese Academy of Sciences,Shenyang 110016,China;2Graduate School of Chinese Academy of Sciences,Beijing 100039,China; 3Shenyang Univers    ity,Shenyang 110044,China;4Southwest Agricultural University, Chongqing 400716,China

  • Received:2004-11-15 Revised:2005-03-07 Online:2005-07-18

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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·kg-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: Vermiculture, Vermicompost, Soil borne disease, Inhibition