Table 1 Summary statistics of diameter at breast height (D) and total aboveground biomass (AGB) of Masson pine by origins (natural and planted forests) and secondary climate zones for model calibration and validation datasets used in this study (N denotes the total number of observations, and SD denotes the standard deviation)
Variable | Calibration data | Validation data | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
N | Mean | SD | Min | Max | N | Mean | SD | Min | Max | |
Natural | ||||||||||
  D (cm) | 62 | 17.38 | 12.24 | 2.00 | 43.10 | 15 | 18.45 | 13.61 | 2.00 | 47.20 |
 AGB (kg) | 62 | 178.16 | 233.07 | 0.54 | 1039.14 | 15 | 213.35 | 295.64 | 0.59 | 981.78 |
Planted | ||||||||||
  D (cm) | 58 | 15.48 | 11.36 | 1.50 | 40.70 | 15 | 15.48 | 13.62 | 2.10 | 39.20 |
 AGB (kg) | 58 | 146.42 | 209.30 | 0.32 | 751.94 | 15 | 175.08 | 272.75 | 0.75 | 797.05 |
North-subtropical | ||||||||||
  D (cm) | 19 | 11.84 | 11.01 | 1.60 | 41.40 | 3 | 10.07 | 5.42 | 5.90 | 16.20 |
 AGB (kg) | 19 | 77.14 | 144.87 | 0.54 | 575.09 | 3 | 34.37 | 43.09 | 4.08 | 83.71 |
Middle-subtropical | ||||||||||
  D (cm) | 73 | 17.82 | 11.62 | 1.50 | 43.10 | 21 | 19.13 | 15.04 | 2.00 | 47.20 |
 AGB (kg) | 73 | 188.48 | 237.14 | 0.38 | 1039.14 | 21 | 250.65 | 315.57 | 0.59 | 981.78 |
South-subtropical | ||||||||||
  D (cm) | 28 | 16.06 | 12.41 | 1.70 | 37.50 | 6 | 12.83 | 8.18 | 5.90 | 25.20 |
 AGB (kg) | 28 | 154.07 | 212.94 | 0.32 | 751.94 | 6 | 76.62 | 104.13 | 4.91 | 268.05 |
Total | ||||||||||
  D (cm) | 120 | 16.47 | 11.81 | 1.50 | 43.10 | 30 | 16.96 | 13.47 | 2.00 | 47.20 |
 AGB (kg) | 120 | 162.82 | 221.54 | 0.32 | 1039.14 | 30 | 194.22 | 280.16 | 0.59 | 981.78 |