基于GIS的百花湖流域土地利用变化与水质响应

利用ArcGIS和ENVI软件并结合Spearman分析法,探究百花湖流域1997年、2007年和2017年土地利用类型变化对5种水质指标年均值的响应。结果表明:1997—2017年流域内林地和建筑用地面积递增,耕地面积递减,林地占整个流域面积的50%以上;在土地转移中林地、建筑用地和耕地之间的转移最大,林地和建筑用地的增加主要来自耕地;1997年水质最好,2007年水质最差,2017年对流域实施水污染治理工程后水质有所改善;相关分析得出建筑用地、耕地与TN、TP、NH 3 N呈显著正相关,对TN、TP、NH 3 N有“源”的作用,林地与TN、TP呈显著负相关,对TN、TP有“汇”的作用。

Land Use Change and Corresponding Water Quality in Baihua Lake Basin Based on GIS

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 NH 3 N,and were the source of TN,TP and NH 3 N.Forest land was significant negative correlated with TN and TP,and had a convergence effect on TN and TP.