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| Variable | The relatively stable period (2005–2009) | The rapid rising period (2010–2012) | The fluctuating rising period (2013–2020) | The entire period (2005–2020) |
|---|---|---|---|---|
| Precipitation | 3.15 | 5.41 | 6.73 | 5.09 |
| NDVI | 9.41 | 14.36 | 34.07 | 27.52 |
| DEM | 1.56 | 1.75 | 1.07 | 1.40 |
| Topography | 35.78 | 30.04 | 30.99 | 34.76 |
| Land use type | 26.45 | 28.58 | 26.17 | 22.72 |
| Population density | 23.65 | 19.86 | 0.97 | 8.51 |
