Effect of Groundwater Irrigation on Soil PAHs Pollution Abatement and Soil Microbial Characteristics:A Case Study in Northeast China  

作　　者：ZHANG Jing ZHANG Hui-Wen ZHANG Cheng-Gang 

机构地区：[1]Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016 (China) [2]State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China)

出　　处：《Pedosphere》2010年第5期557-567,共11页土壤圈（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No.40801091);the National Basic Research Program(973 Program)of China(No.2004CB418503)

摘　　要：To evaluate the effect of groundwater irrigation on the polycyclic aromatic hydrocarbons(PAHs) pollution abatement and soil microbial characteristics,a case study was performed in the Shenfu irrigation area of Shenyang,Northeast China,where the irrigation with petroleum wastewater had lasted for more than fifty years,and then groundwater irrigation instead of wastewater irrigation was applied due to the gradually serious PAHs pollution in soil.Soil chemical properties,including PAHs and nutrients contents,and soil microbial characteristics,including microbial biomass carbon,substrateinduced respiration,microbial quotient(qM),metabolic quotient(qCO2),dehydrogenase(DH),polyphenol oxidase(PO),urease(UR) and cellulase(CE) in surface and subsurface were determined.Total organic C,total N,total P,and available K were significantly different between the sites studied.The PAHs concentrations ranged from 610.9 to 6362.8 μg kg-1 in the surface layers(0-20 cm) and from 404.6 to 4318.5 μg kg-1 in the subsurface layers(20-40 cm).From the principal component analysis,the first principal component was primarily weighed by total PAHs,total organic C,total N,total P and available K,and it was the main factor that influencing the soil microbial characteristics.Among the tested microbial characteristics,DH,PO,UR,CE,qM and qCO2 were more sensitive to the PAHs stress than the others,thus they could serve as useful ecological assessment indicators for soil PAHs pollution.To evaluate the effect of groundwater irrigation on the polycyclic aromatic hydrocarbons （PAHs） pollution abatement and soil microbial characteristics, a case study was performed in the Shenfu irrigation area of Shenyang, Northeast China, where the irrigation with petroleum wastewater had lasted for more than fifty years, and then groundwater irrigation instead of wastewater irrigation was applied due to the gradually serious PAHs pollution in soil. Soil chemical properties, including PAHs and nutrients contents, and soil microbial characteristics, including microbial biomass carbon, substrateinduced respiration, microbial quotient （qM）, metabolic quotient （qCO2）, dehydrogenase （DH）, polyphenol oxidase （PO）, urease （UR） and cellulase （CE） in surface and subsurface were determined. Total organic C, total N, total P, and available K were significantly different between the sites studied. The PAHs concentrations ranged from 610.9 to 6 362.8 μg kg^-1 in the surface layers （0-20 cm） and from 404.6 to 4318.5 μg kg^-1 in the subsurface layers （20-40 cm）. From the principal component analysis, the first principal component was primarily weighed by total PAHs, total organic C, total N, total P and available K, and it was the main factor that influencing the soil microbial characteristics. Among the tested microbial characteristics, DH, PO, UR, CE, qM and qCO2 were more sensitive to the PAHs stress than the others, thus they could serve as useful ecological assessment indicators for soil PAHs pollution.

关 键 词：microbial biomass paddy soil polycyclic aromatic hydrocarbons soil enzyme activities 

分 类 号：X132[环境科学与工程—环境科学] S154.3[农业科学—土壤学]