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Table 2 Best fitted regression models for predicting aboveground biomass of A. grandibracteata and T. dregeana

From: The accuracy of species-specific allometric equations for estimating aboveground biomass in tropical moist montane forests: case study of Albizia grandibracteata and Trichilia dregeana

Equation No.Allometric equationsCoefficientsModel performance statistics
SymbolValueAdj.R2RSEAICCFp-value
AgEq1TAGB = exp[α + β1ln(D) + β2ln(H) + β3ln(ρ)]α− 0.7930.99360.1347− 79.491.0091 ≤ 0.001
β12.117
β20.062
β30.991
AgEq2TAGB = exp[α + β1 ln(D2H) + β2ln(ρ)]α− 0.8100.9830.2198− 50.961.0245 ≤ 0.001
β10.749
β21.030
AgEq3TAGB = exp[α + β1ln(D)]α− 1.7440.97970.2408− 46.411.0294 ≤ 0.001
β12.241
AgEq4TAGB = exp[α + β1ln(D) + β2ln(H)]α− 1.7550.9790.2449− 44.491.0304 ≤ 0.001
β12.199
β20.049
AgEq5TAGB = exp[α + β1ln(D2H)]α− 1.8340.96810.3016− 32.891.0465 ≤ 0.001
β10.775
AgEq6TAGB = exp[α + β1ln(H)]α− 1.3630.85450.643712.591.2302 ≤ 0.001
β12.286
AgEq7TAGB = exp[α + β1ln(ρDH)]α− 0.6990.96820.300716.971.0462 ≤ 0.001
β11.129
Ag Eq8TAGB = exp[α + β1ln(DH)]α− 1.8030.95140.372229.771.0717 ≤ 0.001
β11.172
TdEq1TAGB = exp[α + β1 ln(D) + β2 ln(H) + β3 ln(ρ)]α− 2.5260.9750.320422.551.0560 ≤ 0.001
β12.029
β20.593
β30.648
TdEq 2TAGB = exp[α + β1ln(D2H) + β2ln(ρ)]α− 2.7560.9730.330223.491.0560 ≤ 0.001
β10.897
β20.562
TdEq 3TAGB = exp[α + β1ln(D2H)]α− 3.1680.9720.340824.481.0598 ≤ 0.001
β10.888
TdEq 4TAGB = exp[α + β1ln(D) + β2ln(H)]α− 3.0320.9720.337124.741.0585 ≤ 0.001
β11.964
β20.641
TdEq 5TAGB = exp[α + β1ln(D)]α− 2.5630.9620.391132.741.0795 ≤ 0.001
β12.427
TdEq 6TAGB = exp[α + β1ln(DH)]α− 3.3560.9580.412135.871.0886 ≤ 0.001
β11.377
TdEq 7TAGB = exp[α + β1ln(ρDH)]α− 2.2200.9510.446740.711.1049 ≤ 0.001
β11.393
TdEq 8TAGB = exp[α + β1ln(H)]α− 3.0880.8190.856579.771.4431 ≤ 0.001
β12.771
  1. Where TAGB: aboveground tree biomass (kg); D: diameter at breast height of tree (cm); H: total tree height (m); ρ: Wood Density (g cm−3); α: intercept; β1, β2, β3: are slopes; adj.R2: adjusted R square; RSE: Residual Standard Error; AIC: Akaike Information Criterion; CF: correction factor; AgEq: A. grandibracteata Equation; TdEq: T. dregeana equation