【摘要】 以位于亚热带低山丘陵地区的安徽省南部宣城市梅村流域为实例,通过航空遥感图像解译、GIS分析和实地定位动态监测方法,研究了具有不同土地利用结构的农-林生态系统地表径流水的磷素含量和输出通量及其与土地利用的定量关系。结果表明,径流量、水溶性磷(DP)和悬浮泥粒含磷(PAP)的输出量都与林地和水田面积比例具有明显的指数相关性;径流水中PAP的含量与土地利用间存在线性相关关系;PAP的输出与悬浮泥粒的输出量具有显著线性相关性,且受到土地利用的影响;DP的输出则与PAP的输出间具有极显著的对数相关性。更多还原

【Abstract】 The increase of phosphorus concent ration is a crucial factor in causing the eutrophication of water body.Land use has an important impact on agricultural non -point sources(NPS)phosphorus discharge.This study on quantitative relationship of runoff phosphorus discharge and land use wa s conducted in Meicun watershed of Xuancheng County,Anhui Province,in t he subtropical low hill area,by the dynamic monitoring of stream water and nutrient discharge,integrating interpretation of a erial image and GIS analysis.The results showed that,t here were significantly exponentia l relationship between the discharg e of flux,runoff Dissolved Phosphorus(DP)and Particulate -associated Phosphorus(PAP)and the area percentage of forest and paddy.However,PAP concentration in runoff and land use existed significant linear relatio nship,meanwhile PAP discharge and s uspended soil particles also existed statistically signifi cant linear relationship.We also fo und there was a logarithm linear rela tionship between DP and PAP discharge.更多还原