The change of land use type in Baihua Lake basin in 1997, 2007 and 2017 and its influence on the annual average of 5 water quality indicators were studied by ArcGIS, ENVI software and Spearman analysis method. The result showed that from 1997 to 2017, the area of forest land and construction land increased gradually, the cultivated land area decreased. The forest land accounted for more than 50% of the total. The land transfer between forest land, construction land and cultivated land was the largest, the increases of forest land and construction land were mainly from cultivated land. Water quality was the best in 1997 and worst in 2007. When implementing the water pollution control project in 2017, water quality was improved. Correlation analysis results showed that construction land and cultivated land were significant positive correlated with TN, TP and NH3〖FK(W。*9〗〖CD*2〗〖FK)〗N, and were the source of TN, TP and NH3〖FK(W。*9〗〖CD*2〗〖FK)〗N. Forest land was significant negative correlated with TN and TP, and had a convergence effect on TN and TP. |