Table 4.
Significance test results of the main drivers of RSEI.
| Year | Variables | Mean | Std | Max | Mix | Median |
|---|---|---|---|---|---|---|
| 2000 | Elevation (m) ** | 1166.51 | 361.93 | 2560.00 | 290.00 | 1151.00 |
| Slope(°)** | 14.85 | 10.99 | 78.17 | 0.96 | 12.69 | |
| Wind speed (m/s) ** | 210.99 | 28.15 | 335.50 | 151.50 | 206.50 | |
| Precipitation accumulation (mm) ** | 85.51 | 18.17 | 151.00 | 53.00 | 81.00 | |
| Vapor pressure (kPa) ** | 1411.07 | 210.88 | 2058.50 | 959.25 | 1397.75 | |
| NPP(kg C/m2)** | 3381.19 | 4264.05 | 32767.00 | 301.00 | 2794.00 | |
| Population density(people/km2)** | 126.17 | 700.25 | 28565.00 | 1.00 | 28.00 | |
| RSEI | 0.42 | 0.16 | 0.96 | 0.04 | 0.41 | |
| 2005 | Elevation (m) ** | 1163.17 | 360.54 | 2560.00 | 290.00 | 1147.00 |
| Slope(°)** | 14.76 | 10.90 | 78.17 | 0.96 | 12.45 | |
| Wind speed (m/s) ** | 219.66 | 27.91 | 341.00 | 151.50 | 216.00 | |
| Precipitation accumulation (mm) ** | 84.38 | 22.45 | 155.50 | 50.75 | 78.00 | |
| Vapor pressure (kPa) | 1329.07 | 186.24 | 1918.00 | 922.50 | 1312.00 | |
| NPP(kg C/m2)** | 4551.39 | 4080.77 | 32767.00 | 829.00 | 4082.00 | |
| Population density(people/km2)** | 137.17 | 622.20 | 21374.00 | 1.00 | 20.00 | |
| RSEI | 0.46 | 0.16 | 0.94 | 0.00 | 0.46 | |
| 2010 | Elevation (m) ** | 1160.23 | 359.71 | 2560.00 | 290.00 | 1144.00 |
| Slope(°)** | 14.65 | 10.82 | 78.17 | 0.96 | 12.35 | |
| Wind speed (m/s) ** | 214.09 | 28.16 | 335.25 | 151.75 | 209.50 | |
| Precipitation accumulation (mm) ** | 93.05 | 17.15 | 150.00 | 59.50 | 90.75 | |
| Vapor pressure (kPa) ** | 1392.91 | 210.46 | 2086.75 | 954.25 | 1382.00 | |
| NPP(kg C/m2)* | 3944.63 | 4139.76 | 32767.00 | 978.00 | 3424.00 | |
| Population density(people/km2)** | 139.56 | 669.83 | 23542.00 | 1.00 | 18.00 | |
| RSEI | 0.49 | 0.16 | 0.95 | 0.05 | 0.49 | |
| 2015 | Elevation (m) ** | 1160.65 | 359.63 | 2560.00 | 290.00 | 1145.00 |
| Slope(°)** | 14.65 | 10.83 | 78.17 | 0.96 | 12.35 | |
| Wind speed (m/s) ** | 226.77 | 26.99 | 342.25 | 164.50 | 223.00 | |
| Precipitation accumulation (mm) ** | 71.58 | 11.13 | 110.75 | 50.00 | 69.50 | |
| Vapor pressure (kPa) ** | 1270.79 | 186.19 | 1849.75 | 868.00 | 1254.50 | |
| NPP(kg C/m2)** | 4351.45 | 4109.18 | 32767.00 | 945.00 | 3868.00 | |
| Population density(people/km2)** | 148.24 | 712.48 | 22910.00 | 1.00 | 18.00 | |
| RSEI | 0.54 | 0.16 | 0.96 | 0.09 | 0.54 | |
| 2020 | Elevation (m) ** | 1155.75 | 357.55 | 2560.00 | 290.00 | 1139.00 |
| Slope(°)** | 14.49 | 10.71 | 78.17 | 0.96 | 12.31 | |
| Wind speed (m/s) ** | 218.49 | 28.93 | 340.00 | 147.50 | 215.00 | |
| Precipitation accumulation (mm) ** | 86.27 | 9.88 | 120.25 | 56.50 | 85.75 | |
| Vapor pressure (kPa) * | 1428.38 | 187.56 | 2029.75 | 1028.25 | 1414.25 | |
| NPP(kg C/m2)* | 4348.49 | 4125.43 | 32767.00 | 945.00 | 3858.00 | |
| Population density(people/km2)** | 147.52 | 573.86 | 17263.00 | 1.00 | 16.00 | |
| RSEI | 0.58 | 0.15 | 0.97 | 0.07 | 0.58 |
**,* represent passing the 1%,5% significance level, respectively.