中文摘要：

为定量研究农田径流中氮磷负荷,通过野外采样和室内分析相结合的方法,研究了赣江尾闾区休耕期农田沟渠径流中氮、磷含量水平及其迁移特征。结果表明,农田沟渠径流中总氮（TN）、总磷（TP）含量均值分别为1.177mg/L、0.044mg/L,与同时期下游河渠水体中氮、磷含量（TN为0.936mg/L,TP为0.032mg/L）相比,农田沟渠径流中氮、磷含量较高,对河渠水体中氮、磷含量水平具有重要贡献;在沿程变化上,其含量虽然有起伏变化,但总的趋势为沿程下降。农田沟渠系统对氮磷均有一定的截留去除效果。

英文摘要：

The nitrogen phosphorus concentration levels and migration of farmland ditch runoff in Ganjiang river were investigated based on field sampling and experimental analysis.Results showed that the mean values of total nitrogen（TN） and total phosphorus（TP） were 1.177 mg/L and 0.044 mg/L,respectively.In comparison with rivers（TN=0.936 mg/L,TP=0.032 mg/L）,the nitrogen phosphorus contents of farmland ditch runoff were higher,which could contributes greatly to river nitrogen phosphorus.In spatial distribution of nitrogen phosphorus concentration,the changes of their contents fluctuated,but the general trend was decreasing gradually.The farm ditch system had a good interception and removal efficiency of nitrogen and phosphorus.