三峡库区典型农业小流域水体水质与径流氮磷流失研究——以云阳县活龙村为例

Research on Water Quality and Runoff Loss of Nitrogen and Phosphorus from the Typical Agricultural Watersheds in Three Gorges Reservoir Area——A Case Study in Huolong,Yunyang County

为了研究三峡库区面源污染状况,选取云阳县活龙村的典型农业小流域为研究对象,对水体水质和径流氮磷流失量进行研究。结果表明:总氮浓度超过地表水V类水质标准的高达79.6%,总磷浓度超过地表水V类水质标准的仅占15.9%,区域地表水体受氮素污染比较严重,以硝态氮(NO3-)为主;研究监测期间平均单位面积农田径流氮磷排放负荷分别为3.39kg.ha-1和0.09kg.ha-1;农田径流氮磷流失量分别占氮磷总流失量的3.00%和0.25%。

In order to study non-point source pollution in the Three Gorges Reservoir Area,the typical small agricultural watersheds of Huolong village in Yunyang County were selected for studying the water quality and runoff loss of nitrogen and phosphorus.The analysis on collected water samples shows total nitrogen concentration of 79.6% samples exceeded the quality standard of Grade V water stipulated in the National Environmental Quality Standards for surface water;however,total phosphorus concentration of only 15.9% samples exceeded the quality standard of Grade V water;the nitrogen pollution is quite serious,especially that of NO-3.During the period from early April to December of 2010 runoff loss of nitrogen and phosphorus discharge loads of average unit farmland are 3.39 kg·ha^-1 and 0.09 kg·ha^-1 respectively;agricultural runoff losses of nitrogen and phosphorus account for 3.00% of the total N runoff and 0.25% of the total P runoff.