Journal of Ecology and Rural Environment ›› 2018, Vol. 34 ›› Issue (2): 177-183.doi: 10.11934/j.issn.1673-4831.2018.02.011

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Changes in Population of Soil Microbe and Activity of Soil Enzyme in Rhizospheres of Two Wetland Plants Under Stress of Hexachlorobenzene

ZHANG Cui-ping1, LI Shu-ying1, WANG Bei1,2, LU Guo-li1, ZHU Chun-rong1, ZHOU Yuan-qing1   

  1. 1. Research Center for Pollution Control and Ecological Restoration, Yuxi Normal University, Yuxi 653100, China;
    2. Institute of Ecology and Geobotany, Yunnan University, Kunming 650091, China
  • Received:2017-04-11 Online:2018-02-25 Published:2018-02-09


To investigate plant rhizospheric effects on biodegradation of chlorobenzene compounds in constructed wetlands, Phragmites australis and Typha angustifolia, two typical wetland plants, were selected and planted in a simulated outdoor constructed wetland mesocosm to explore changes in population of soil microbe and activity of soil enzyme in the rhizosphere of the plants under stress of hexachlorobenzene. Results show that both P. australis and T. angustifolia significantly affected soil microbe (bacteria, fungi and actinomycetes) in population and soil enzymes[dehydrogenase (DEH), catalase (CAT) and polyphenol oxidase (PPO)], in activity in the rhizosphere, which were all higher than in the non-rhizosphere soils, and the rhizosphere effects of T. angustifolia were higher than those of P. australis (P<0.05). Population of the soil microbe and activities of the soil enzymes were found negatively related to concentration of HCB in the rhizospheres of P. australis and T. angustifolia,and particularly to the activities of DEH and PPO in the rhizospheres of T. angustifolia(P<0.01). The rhizospheric effects of the two plants increased with the increase in microbial population and enzyme activity in the rhizospheres of the plants, which in turn helps remove HCB in the wetland ecosystem.

Key words: constructed wetland, rhizospheric effect, microbial population, enzyme activity, hexachlorobenzene

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