不同土地利用类型对西凉湖面源污染的影响

运用高清遥感影像人工目视解译更新西凉湖周边土地利用类型,结合耕地不同类型N、P、K及尿素使用量,估算了湖区周边耕地不同类型的面源污染输出。结果表明,西凉湖面源污染主要以氮的输出为主,主要输出源是稻田,旱地对磷的输出贡献最大,水浇地季节变动性大且人为干预明显,其影响程度也不容忽视。

Using high-definition remote sensing image artificial visual interpretation and updating of land use types around Xil-iang Lake, and based on different types of cultivated land, i.e., N, P, K and urea usage, the paper estimated the different types ofnon-point source pollution output of cultivated land around the lake area. The results showed that the main source of non-point pol-lution in Xiliang Lake was the output of nitrogen, and the main source was rice field. The dry land contributed the most to the out-put of phosphorus, the seasonal variability of irrigated land was great and the human intervention was obvious, and the degree of in-fluence cannot be ignored.