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Gray forecasting on changing tendency of water quality in Zhalong wetland by Gray Model

AN Renlin1,MA Yun2,ZHAI Pingyang2,E Yong1 (1. College of Resources and Environmental Sciences,Northeast Agricultural University,Harbin 150030,China; 2. Heilongjiang Institute of Environmental Protection Research,Harbin 150056,China)  
Zh along Wetland is one of the earliest wetlands which located in the international important wetland register. During recent years,the water pollution of Zhalong wetland that normally attributed to anthropogenic activities which attracted a lot of attention of scientific community. The changing tendency of TN,TP,CODMn and BOD5 concentrations in water of Zhalong wetland at different sites,Dongsheng reservoir,Tumuke bridge and Hata bridge,in the future it would be forecasted by Matlab Software and GM(1.1) to establish,which based on the measurement dates during recent years. The concentrations of CODMn and BOD5 in water at different sites showed an increasing trend and the concentrations of TN and TP showed slightly decreasing trend. Finally the reasonable ecologic remedy was proposed forward.
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