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

我们首先分析了从卫星图像计算的月最大归一化植被指数（NDVI）图像估计的土地覆盖类型和流域排放的年总氮负荷之间的关系。结果表明，城市径流负荷系数高于森林覆盖区。研究还发现，种植园和田间杂草群落等土地覆盖类型对各流域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价。此外，我们还评估了河流流域的状况。

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.