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Table 3 Comparison of species-specific to pan-tropical equations in predicting 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

Input variable

Source

Type

Equations

Mean biomass difference (kg)

PBIAS

RMSE

Pared t-test

T-value

p-value

D

Chave et al. [12]

PT

AGB = ρ × 0.223 × (D)2.148 × (D2)0.207 × (D3)0.028

1117.20

190.29

1859.62

4.047

0.000

AgEq3

SS

TAGB = 0.175 × D2.241

6.45

1.09

213.94

0.163

0.872

D, H, ρ

Chave et al. [5]

PT

TAGB. = 0.0673 × (ρD2H)0.976

457.88

77.99

776.72

3.931

0.000

AgEq2

SS

TAGB = 0.445 × (D2H)0.749 × ρ1.030

63.21

− 10.77

216.44

− 1.644

0.111

AgEq5

SS

TAGB = 0.159 × (D2H)0.787

41.99

− 7.15

212.58

− 1.085

0.287

AgEq7

SS

TAGB = 0.497 × (ρDH)1.129

95.61

− 16.29

269.68

− 2.042

0.050

Brown et al. [41]

TFM

TAGB = 0.0899 × (D2Hρ)0.9522

499.95

85.16

822.14

4.125

0.000

AgEq1

SS

TAGB = 0.452 × D2.117 × H0.062 ×ss ρ0.991

33.85

− 5.77

179.34

− 0.035

0.309

D

Brown [13]

TFM

TAGB = 0.118 × D2.53

1235

210.36

2073.59

3.993

0.000

AgEq3

SS

TAGB = 0.175 × D2.241

6.45

1.09

213.94

0.163

0.872

D, H, ρ

Chave et al. [12]

TFM

AGB = 0.0509 × ρD2H

430.28

73.29

752.12

3.756

0.001

AgEq1

SS

TAGB = 0.452 × D2.117 × H0.062 × ρ0.991

33.85

− 5.77

179.34

− 0.035

0.309

AgEq4

SS

TAGB = 0.173 × D2.199 × H0.049

3.6292

0.62

211.03

0.093

0.927

AgEq2

SS

TAGB = 0.445 × (D2H)0.749 × ρ1.030

63.21

− 10.77

216.44

− 1.644

0.111

AgEq7

SS

TAGB = 0.497 × (ρDH)1.129

95.61

− 16.29

269.68

− 2.042

0.050

D

Chave et al. [12]

PT

TAGB = ρ × 0.223 × (D)2.148 × (D2)0.207 × (D3)0.028

1990.50

211.85

4322.19

− 2.794

0.009

TdEq 5

SS

TAGB = 0.077 × D2.427

89.89

9.57

552.83

− 0.889

0.381

D,H, ρ

Chave et al. [5]

PT

TAGB. = 0.0673 × (ρD2H)0.976

555.82

59.15

1099.35

− 3.156

0.004

TdEq2

SS

TAGB = 0.064 × (D2H)0.897 × ρ0.562

130.80

− 13.92

575.44

1.257

0.219

TdEq3

SS

TAGB = 0.042 × (D2H)0.888

124.93

− 13.29

534.76

1.294

0.206

Brown et al. [41]

TFM

TAGB = 0.0899 × (D2Hρ)0.9522

592.60

63.07

1128.80

− 3.322

0.002

TdEq1

SS

TAGB = 0.0799 × D2.029 × H0.593 × ρ0.648

85.33

− 9.08

493.59

0.945

0.352

TdEq2

SS

TAGB = 0.064 × (D2H)0.897 × ρ0.562

130.80

− 13.92

575.44

1.257

0.219

TdEq7

SS

TAGB = 0.109 × (ρDH)1.393

236.08

− 25.13

907.31

1.451

0.157

D

Brown [13]

TFM

TAGB = 0.118 × D2.53

1532.30

163.08

3409.18

− 2.709

0.011

TdEq5

SS

TAGB = 0.077 × D2.427

89.89

9.57

552.83

− 0.889

0.381

D, H, ρ

Chave et al. [12]

TFM

TAGB = 0.0509ρD2H

539.11

57.38

1101.95

− 3.021

0.005

TdEq1

SS

TAGB = 0.0799 × D2.029 × H0.593 × ρ0.648

85.325

− 9.08

493.59

0.945

0.352

TdEq2

SS

TAGB = 0.064 × (D2H)0.897 × ρ0.562

130.80

− 13.92

575.44

1.257

0.219

TdEq3

SS

TAGB = 0.042 × (D2H)0.888

124.93

− 13.29

534.76

1.294

0.206

TdEq7

SS

TAGB = 0.109 × (ρDH)1.393

236.08

− 25.13

907.31

1.451

0.157

  1. PT: Pan-tropical, TFM: Tropical Forests Moist, SS: Species-specific, PBIAS: percent bias, RMSE: root mean square error, D: diameter at breast height, H: total height, ρ: wood density, AgEq: A. grandibracteata Equation; TdEq: T. dregeana Equation