Evaluation of Total Nitrogen Load in the River Basins with RS and GIS Data

我们首先分析了从卫星影像计算的月最大归一化植被指数(NDVI)影像估算的土地覆被类型与流域年总氮排放的关系。研究发现，城区的径流负荷率高于林区。研究还发现，种植园和杂草群落等土地覆被对各流域河流总氮负荷的影响高于其他土地覆盖类型。最后，对各流域河流总氮负荷对湖泊和海洋的影响进行了风险评估。此外，我们还对流域状况进行了评估。

We first analyzed the relation between the land cover types estimated from monthly maximum Normalized Difference Vegetation Index (NDVI) imagery calculated from satellite imagery and the annual total nitrogen load discharged from river basins. We found that the runoff load factor from urban areas is higher than those of forested areas. We also found that the impacts of land cover such as plantation and field weed communities on the total nitrogen load of each river are higher than the impacts of other land cover types.Finally, we evaluated the risk assessment of total nitrogen load impact on lakes and the sea through rivers from each basin. Also, we evaluated the state of river basins.