| 群集 | 高频关键词 |
| 1 | Agriculture, Best management practices, China, Diffuse pollution, Groundwater, Heavy metals, Land use, Nitrate, Nutrients, Remote sensing, Soil erosion, Stormwater, Swat, Water pollution, Watershed |
| 2 | AnnAGNPS, Eutrophication, GIS, Non-point sources, Pollution, Watershed management |
| 3 | Non-point source pollution, Runoff, Water quality |
| 4 | Modeling, Nitrogen, Phosphorus, Sediment |