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Table 8 Above-ground forest tree biomass (AGB kg tree−1) equations for five species and a species group in Mexico

From: Model errors in tree biomass estimates computed with an approximation to a missing covariance matrix

Species # Equation \(\hat{R}^{2}\) \(\hat{\sigma }_{e}^{{}}\)
kg
Sample
size
Guazuma ulmifolia 1 \(\log \left( {\hat{\text{AGB}}} \right) = - 1.62 + 2.12\log \left( {\text{DBH}} \right)\) 0.97 0.48 18
Inga vera 2 \(\log \left( {\hat{\text{AGB}}} \right) = - 4.04 + 4.00\log \left( {\text{DBH}} \right) - 0.29\log \left( {\text{DBH}} \right)^{2}\) 0.97 0.39 15
Ochroma pyramidale 3 \(\log \left( {\hat{\text{AGB}}} \right) = - 2.45 + 2.30\log \left( {\text{DBH}} \right)\) 0.90 0.96 16
Trichospernum mexicanum 4 \(\log \left( {\hat{\text{AGB}}} \right) = - 2.82 + 2.42\log \left( {\text{DBH}} \right)\) 0.96 0.40 16
Quercus castenea 5 \(\hat{\text{AGB}} = 0.0416{\text{DBH}}^{2.7154}\) 0.97 11.6 38
Quercus latea 6 \(\hat{\text{AGB}} = 0.0333{\text{DBH}}^{2.6648}\) 0.92 12.8 7
Quercus spp. 7 \(\hat{\text{AGB}} = 0.0342{\text{DBH}}^{2.7590}\) 0.93 15.7 45
  1. Equations 1–4 are from Douterlungne D, Herrera-Gorocica AM, Ferguson BG, Siddique I and Soto-Pinto L [53]. Equations 5–7 are from Aguilar et al. [52].