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《Chinese Journal of Ecology》 2009-01
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Roles of urban lawn system in controlling rainfall-induced runoff nitrogen pollution

SUN Shu-ming1,2,SHAN Bao-qing1,PENG Wan-jiang3(1Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;2Graduate University of Chinese Academy of Sciences,Beijing 100039,China;3Water Service Co.,Ltd,Tianjin Airport Industrial Park,Tianjin 300308,China)  
To control the rainfall-induced runoff pollution in the urban sightseeing areas of Wuhan,a lawn system was constructed in the Deer Yard of Wuhan Zoo.In this paper,the roles of the lawn system in controlling rainfall-induced runoff nitrogen pollution and in reserving rainfall nitrogen were studied.The results showed that the concentrations of total nitrogen(TN),total dissolved nitrogen(DN),and ammonium nitrogen(NH4+-N) in pretreated rainfall-induced runoff decreased by 16.0%,13.9%,and 75.6%,respectively.The retention rates of influent nitrogen by the lawn system were 90% of NH4+-N,65% of TN and DN,and 5% of nitrate nitrogen(NO3--N).Hydraulic loading rate affected the effluent TN concentration and its removal rate significantly.When the influent TN concentration was nearly the same while hydraulic loading rate increased from 3.3 to 8.3 cm·d-1,the removal rate of TN decreased from 28.0% to 19.8%.Lawn width also affected the concentrations of effluent N pollutants.With the increase of lawn width,the effluent NH4+-N concentration decreased,while NO3--N concentration increased.The DN concentration was the lowest at 10 m of lawn width.At the meantime of purifying rainfall-induced runoff,lawn system increased the nutrients re-use and rainwater recycling,and saved the cost of lawn maintenance.
【Fund】: 天津市科技创新专项(06FZZDSH00900);; 中国科学院知识创新工程重大资助项目(KZCX1-WY-06-02)
【CateGory Index】: X52
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