Table 1 The parameters of the statistics-based multiple regression model between forest net primary productivity (NPP) and environmental variables (T is annual temperature (°C), P is annual precipitation (mm), A is altitude (m), NDVI is normalized difference vegetation index (0 < NDVI ≤1))
From: Variation of net primary productivity and its drivers in China’s forests during 2000–2018
Parameters | Coefficients | Standard error | t Stat | P-value | Lower 95% | Upper 95% |
|---|---|---|---|---|---|---|
Intercept | 333.670 | 56.330 | 5.923829 | 4.33E-09 | 223.140 | 444.21 |
T | −9.136 | 3.680 | −2.483880 | 0.01316 | −16.350 | −1.92 |
P | 0.128 | 0.056 | 2.285529 | 0.022492 | 0.018 | 0.24 |
T × P | 0.022 | 0.004 | 5.620419 | 2.47E-08 | 0.014 | 0.03 |
A | −0.027 | 0.009 | −3.193080 | 0.001452 | −0.044 | − 0.01 |
NDVI | 97.130 | 59.240 | 1.639560 | 0.101413 | −19.120 | 213.39 |