[Impacts of petroleum-containing wastewater irrigation on microbial population and enzyme activities in paddy soil of Shenfu irrigation area].
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 x 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).
Li
Hui
H
Key Laboratory of Terrestrial Ecological Processes, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China. lihui1977780@sohu.com
Chen
Guanxion
G
Yang
Tao
T
Zhang
Chenggang
C
D006838:Hydrocarbons / Q000032:analysis; D007220:Industrial Waste / Q000032:analysis; D012275:Oryza / Q000254:growth & development*; D010088:Oxidoreductases / Q000378:metabolism; D010578:Petroleum; D012987:Soil / Q000032:analysis*; D012988:Soil Microbiology; D014865:Waste Disposal, Fluid / Q000379:methods*
D006838:Hydrocarbons; D007220:Industrial Waste; D010578:Petroleum; D012987:Soil; D010088:Oxidoreductases