Table 5.
Potential Influencing Factors of TN Concentrations.
| Category | Explanatory Variables |
|---|---|
| Topography | Mean slope |
| Area | |
| Land use and land cover | Percentage of cropland |
| Percentage of forestland | |
| Percentage of grassland | |
| Percentage of urban development land | |
| Percentage of rural development land | |
| Percentage of wetland | |
| Percentage of shrub | |
| Percentage of barren land | |
| Percentage of road | |
| Percentage of water | |
| Soil property | Percentage of hydrological soil group A |
| Percentage of hydrological soil group B | |
| Percentage of hydrological soil group C | |
| Percentage of hydrological soil group D | |
| Pollution source | Distance-weighted TN load from point sources |
| Rural population density | |
| Animal manure load density |