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| Phytoremediation of polycyclic aromatic hydrocarbons(PAHs)-contaminated soil by intercropped beet-grasses |
| Received:November 25, 2015 |
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| KeyWord:polycyclic aromatic hydrocarbons;phytoremediation;intercropping;soil |
| Author Name | Affiliation | E-mail | | WANG Jiao-jiao | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | HU Shi-bin | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | hushibin2003@nwsuaf.edu.cn | | WEI Li-qiong | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | CHAI Qin-qin | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | LIU Jin-bo | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | WANG Jia-ying | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | YANG Wen-xiao | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | |
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| Abstract: |
| A pot experiment was conducted to investigate removal mechanisms and remediation efficiencies of polycyclic aromatic hydrocarbons(PAHs) under beet and grass intercropping systems in a greenhouse. Representative PAHs, phenanthrene, fluoranthene, pyrene and benzo(a) pyrene, were used, and four plant species, cash crops(beet) and gramineae(ryegrass, sudangrass and vetiver grass) selected. The experiment lasted 180 days and two harvests were performed. Plants grew normal at initial concentrations of phenanthrene(101.23±6.63) mg·kg-1, fluoｒａｎｔｈｅｎｅ(９９．7９±4．21) mg·kg-1, pyrene(105.41±4.59) mg·kg-1 and benzo(a) pyrene(50.12±7.75) mg·kg-1. The efficiencies of PAHs removal were greater in treatments with plants than in no-plant control, and higher in beet-grass intercropping than in single cropping. The reduction of PAHs was 84.85%, 84.11%, and 79.96% for beet-ryegrass, beet-vetiver grass and beet-sudangrass, respectively. Beet plants grew even better when intercropped with other plants in contaminated soil. Soil polyphenol oxidase and catalase activities were enhanced by growing plants, with 4.37%~43.07% higher activities in intercropping system than in single-cropping system. Catalase was relatively more sensitive than polyphenol oxidase to soil pollution, which may serve as an indicator to evaluate the risk of polycyclic aromatic hydrocarbon contaminated soil. Therefore, the present results suggest that grasses and beet intercropping is a feasible technique for phytoremediating PAHs contaminated soils． |
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