沟渠廊道提供了氮磷输送与排放通道,同时还提供氮磷滞留降解的环境,因此排水沟渠及其连通程度与氮磷输移及面源污染排放密切相关。为揭示不同连接度水平对氮磷污染物质扩散功能和净化功能的影响,论文以江苏盐城农业垦区排水沟为研究对象,分别在2015年8月和10月两次降水事件前后对不同等级排水沟进行4次水质(氮磷)监测,研究构建了基于氮磷输移过程关系的沟渠廊道连接度模型,进而利用回归模型分析了垦区排水沟连通度与氮磷输移的关系,结果显示:1)氮磷负荷呈现出10月雨前<8月雨前<10月雨后<8月雨后的时间变化特征,并有从上游到下游先升后降的空间变化特征;2)回归模型分析表明,排水沟TN、TP输出随沟渠廊道连接度的增大呈先增后减的趋势,且其拐点分别位于沟渠廊道连接度为0.79、0.77时。研究表明,排水沟连接对于农田排水沟的扩散和净化功能的发挥起着重要作用,农业面源污染可以通过提高排水沟连接度来控制。 Gully corridors provide nitrogen and phosphorus transport and discharge channels, and also provide an environment for nitrogen and phosphorus detention and degradation. Therefore, drainage channels and their connectivity are closely related to nitrogen and phosphorus transport and non-point source pollution discharge. In order to reveal the effect of different levels of connectivity on the diffusion function and purification function of nitrogen and phosphorus pollutants, the paper takes drainage ditches of agricultural reclamation area in Yancheng, Jiangsu as the research object, respectively, before and after the two precipitation events in August and October 2015, We conducted a four-time monitoring of water quality (nitrogen and phosphorus), constructed a model of ditch corridor connectivity based on the relationship between nitrogen and phosphorus transport, and then analyzed the relationship between drainage ditch connectivity and nitrogen and phosphorus transport by using regression models. The results showed that: 1) The nitrogen and phosphorus loadings showed the time-varying characteristics after rain before October