梁平县境内高滩河水质的空间分布及其对土地利用方式的响应

摘要

以梁平县境内高滩河流域为研究对象,综合应用GIS空间分析、Pearson相关分析和RDA冗余分析方法,研究在子流域尺度上COD、BOD5、氨氮和总磷4种水质要素对土地利用方式的生态响应.结果表明:高滩河流域土地利用类型对水质要素有着重要影响,林地能够改善河道水环境,旱地和城镇村和工矿用地是COD、BOD5和氨氮的主要污染来源,园地、交通运输用地以及水域对污染物的影响较弱,说明农业面源污染和农村居民生活污染是高滩河水质恶化的主要原因.%The relationship between water quality and land use was very important to protect the water environment.Based on GIS spatial analysis tool,Pearson correlation and RDA redundancy analysis,this paper focused on quantitative relationships between land use and water quality (COD,BOD5,NH3-N,TP) in Gaotan River Basin on sub-watershed scale.The results showed that:the land use of study area had an important effect on water quality,forest could improve the water environment,the dry land,urban village and industrial land were the main pollution source of COD,BOD5,NH3-N.Garden plot,land for transportation,water area had weaker influence on pollutants,proved that the agricultural non-point source pollution and residents of sewage in rural areas were the main reason for the water quality deterioration in Gaotan River Basin.The study results should provide practical guidelines for the management of water environment in Gaotan River Basin.