基于控制单元的独流减河流域农村非点源污染空间特征解析

Spatial characteristics analysis of agricultural non-point source pollution in Duliujian River basin based on controlling unit

提出了一种基于子流域的控制单元划分方法,估算了独流减河流域农田种植、畜禽养殖、农村生活和水产养殖4个主要来源的农村非点源COD、TN、TP和氨氮的入河量,并进行空间特征解析。结果表明,2015年独流减河流域农村非点源COD、TN、TP和氨氮总入河量分别为5 036.20、1 373.94、231.75、573.73t,COD是流域中最主要的农村非点源污染物。4个来源对流域污染物入河量的贡献大小依次为农村生活、农田种植、水产养殖和畜禽养殖。空间特征解析结果表明,西部的控制单元1和控制单元2污染物入河量大,东北部的控制单元3、控制单元4包括控制单元5污染物入河量小。主要污染水系为子牙河水系、南运河水系、青静黄排水渠水系、运东排干水系等。

A method for controlling units division was figured out based on sub-catchments.River input amounts of COD,TN,TP and ammonia nitrogen from 4 major agricultural non-point sources(farmland planting,livestock farming,rural life and aquiculture)in Duliujian River basin were estimated.Besides,the spatial characteristics were also analyzed.Results indicated that the total river input amounts of COD,TN,TP and ammonia nitrogen were 5 036.20,1 373.94,231.75 and 573.73 t.Among them,COD was the major pollutant.The contribution of the sources followed rural life,farmland planting aquiculture and livestock farming.Spatical characteristics analysis showed that the river input amounts were high in the west like Controlling Units 1 and 2,and low in the northeast like Controlling Units 3 to 5,mainly in Ziya River,Nanyun River,Qingjinghuang Drain and Yundong Drain.