The Analysis and Forecast of Eco-environmental Quality of Wetland in Panyu of Guangzhou

Evaluation of eco-environment quality based on remote sensing(RS),geographical information system(GIS) and neural network were carried out on Panyu district of Guangzhou.The results show that the background of ecological environment has changed radically: from 1979 to 2006,the proportion of building area were increased from 2.43% to 29.94% in 2004 and it reached 37.82% in 2006;the proportion of paddy field area were increased from 42.92% to 49.19% in 1990,but it decreased to 22.70% in 2000 and it reached 17.97% in 2006;so the background in Panyu changed from paddy field area in 1979 to building area in 2006.The qualities of the local wetland ecological environment were declining from 1979 to 2000.The ecological environment qualities were good and the ecological effects is less than 2.2 in 1997.During 1990 to 2000,there are some changes in the ecological environment qualities.The ecological environment qualities of some of the wetland were good and the ecological effect was 2.2-3,but the ecological effect in bad environment was over 3.8.After changing from wetland background to building background in 2006,the relative quality of this area got better and the ecological effect was less than 2.2.According to the prediction values of the ecological effect classification of wetland from 2011 to 2016,the qualities of coastal wetland in Panyu will be attributed to the normal level,the ecological effects will be 3.2.