金沙江一级支流龙川江水体氮磷含量动态分析

The Variations of Nitrogen and Phosphorus Concentrations in Longchuan River-a Tributary of Jinsha River

2007～2009年在龙川江楚雄水文站进行采样分析,对龙川江氮(N)、磷(P)含量变化及输出特征进行了研究。结果表明,总氮(TN)和总磷(TP)月均含量分别为1.088～3.834mg/L和0.091～2.036mg/L;其中,N以NO3--N为主,占总氮含量的39.4%～93.7%;P输出以颗粒态磷(PP)为主,占TP的93.6%。TN、NH4+-N和NO3--N的含量随着流量增大而呈现出先升高、后降低的趋势,据此分析流域内主要的N源为农业面源污染;总磷含量随悬浮物含量和流量的升高而升高,且相互之间存在着极其显著的正相关关系。控制雨季土壤的冲刷侵蚀是有效控制磷径流输出的最重要方式。

The study was carried out in Chuxiong station from 2007 to 2009,in order to illustrate characteristics of nitrogen and phosphorus.The mean concentration of total nitrogen(TN) were 1.088 ～ 3.834 mg/L,and mean content of total phosphorus(TP) was about 0.091 ～ 2.036 mg/L,accounted for 39.4 percent to 93.7 percent,and more than 93.6 percent of the total phosphorus was in form of particle phosphorus(PP).TN、NH4 +-N and NO3--N were correlated well with water discharge first and then deviation,Conclude that the var...