| Table 4. Site-specific allometric equations for estimating aboveground biomass of Diospyros mespiliformis in Burkina Faso. ln(β0), β1 and γ represent the intercept and regression coefficients of the models, and their respective standard errors. The indicators of performance for the models include the adjusted coefficient of determination (Adj.R2), residual standard error (RSE), root mean squared error (RMSE), Akaike information criterion (AIC) and correction factor (CF). |
|
|
Regression coefficients |
|
Performance criteria |
|
|
| Equation N° |
Predictors |
ln(β0) |
β1 |
γ |
Models |
Adj.R2 |
RSE |
RMSE |
AIC |
CF |
| Boulon (Sudanian zone) |
| Eq(5) |
DBH |
–2.97***±0.39 |
2.48***±0.12 |
|
Y=1.036×exp (–2.97+2.48 ln (DBH)) |
97.11 |
0.266 |
0.245 |
06.30 |
1.036 |
| D20 |
–4.02*** ±0.50 |
2.65***±0.15 |
|
Y=1.045×exp (–4.02+2.65 ln (D20)) |
96.39 |
0.297 |
0.274 |
09.19 |
1.045 |
| CD |
–0.87ns ±0.46 |
2.46***±0.27 |
|
Y=1.228×exp (–0.87+2.46 ln (CD)) |
87.38 |
0.556 |
0.594 |
25.47 |
1.228 |
| Eq(6) |
DBH2×H |
–2.99***±0.66 |
0.96***±0.08 |
|
Y=1.097×exp (–2.99+0.96 ln (DBH2×H)) |
92.42 |
0.431 |
0.396 |
18.84 |
1.097 |
| DBH2×CD |
–1.39***±0.35 |
0.85***±0.04 |
|
Y=1.037×exp (–1.39+0.85 ln (DBH2×CD)) |
97.03 |
0.270 |
0.248 |
06.65 |
1.037 |
| D202×H |
–3.64**±0.83 |
0.99***±0.09 |
|
Y=1.133×exp (–3.64+0.99 ln (D202×H)) |
89.83 |
0.499 |
0.459 |
22.66 |
1.133 |
| D202×CD |
–2.55***±0.41 |
0.89***±0.05 |
|
Y=1.043×exp (–2.55+0.89 ln (D202×CD)) |
96.59 |
0.289 |
0.266 |
08.46 |
1.043 |
| Eq(7) |
DBH2×H; CD |
–1.85*±0.80 |
0.64**±0.17 |
0.93ns ±0.45 |
Y=1.074×exp (–1.85+0.64 ln (DBH2×H) + 0.93 ln (CD)) |
94.14 |
0.379 |
0.332 |
16.26 |
1.074 |
| D202×H; CD |
–1.97ns ±0.97 |
0.58*±0.19 |
1.14ns ±0.47 |
Y=1.090×exp (–1.97+0.58 ln (D202×H) + 1.14 ln (CD)) |
92.99 |
0.415 |
0.364 |
18.59 |
1.090 |
| Tapoa-Boopo (Sahelo-Sudanian zone) |
| Eq(5) |
DBH |
–3.66***±0.29 |
2.64***±0.09 |
|
Y=1.018×exp (–3.66+2.64 ln (DBH)) |
98.50 |
0.188 |
0.173 |
–02.12 |
1.018 |
| D20 |
–4.20*** ±0.37 |
2.65***±0.11 |
|
Y=1.024×exp (–4.20+2.65 ln (D20)) |
97.98 |
0.218 |
0.201 |
01.12 |
1.024 |
| CD |
–0.55ns ±0.47 |
3.11***±0.28 |
|
Y=1.110×exp (–0.55+3.11 ln (CD)) |
91.12 |
0.457 |
0.420 |
20.36 |
1.110 |
| Eq(6) |
DBH2×H |
–4.19***±0.33 |
1.08***±0.04 |
|
Y=1.020×exp (–4.19+1.08 ln (DBH2×H)) |
98.34 |
0.198 |
0.182 |
–01.42 |
1.020 |
| DBH2×CD |
–2.89***±0.27 |
0.95***±0.03 |
|
Y=1.018×exp (–2.89+0.95 ln (DBH2×CD)) |
98.50 |
0.188 |
0.173 |
–02.78 |
1.018 |
| D202×H |
–4.62***±0.41 |
1.08***±0.05 |
|
Y=1.027×exp (–4.62+1.08 ln (D202×H)) |
97.75 |
0.230 |
0.212 |
02.52 |
1.027 |
| D202×CD |
–3.26***±0.33 |
0.95***±0.04 |
|
Y=1.025×exp (–3.26+0.95 ln (D202×CD)) |
97.92 |
0.221 |
0.203 |
01.46 |
1.025 |
| Eq(7) |
DBH2×H; CD |
–3.52***±0.37 |
0.85***±0.09 |
0.74*±0.28 |
Y=1.013×exp (–3.52+0.85 ln (DBH2×H) + 0.74 ln (CD)) |
98.92 |
0.159 |
0.139 |
–06.28 |
1.013 |
| D202×H; CD |
–3.82***±0.52 |
0.84*** ±0.12 |
0.76ns ±0.36 |
Y=1.020×exp (–3.82+0.84 ln (D202×H) + 0.76 ln (CD)) |
97.09 |
0.201 |
0.176 |
–0.285 |
1.020 |
| Tiogo (Sahelo-Sudanian zone) |
| Eq(5) |
DBH |
–3.86***±0.40 |
2.74***±0.12 |
|
Y=1.012×exp (–3.86+2.74 ln (DBH)) |
97.77 |
0.153 |
0.139 |
–07.16 |
1.012 |
| D20 |
–4.55*** ±0.63 |
2.81***±0.19 |
|
Y=1.024×exp (–4.55+2.81 ln (D20)) |
95.41 |
0.219 |
0.200 |
01.47 |
1.024 |
| CD |
0.16ns ±0.63 |
2.67***±0.35 |
|
Y=1.088×exp (0.16+2.67 ln (CD)) |
83.99 |
0.410 |
0.374 |
16.47 |
1.088 |
| Eq(6) |
DBH2×H |
–4.28***±0.45 |
1.09***±0.05 |
|
Y=1.013×exp (–4.28+1.09 ln (DBH2×H)) |
97.46 |
0.164 |
0.149 |
–05.60 |
1.013 |
| DBH2×CD |
–2.84***±0.34 |
0.95***±0.04 |
|
Y=1.010×exp (–2.84+0.95 ln (DBH2×CD)) |
98.00 |
0.145 |
0.132 |
–08.49 |
1.010 |
| D202×H |
–4.89***±0.59 |
1.12***±0.07 |
|
Y=1.020×exp (–4.89+1.12 ln (D202×H)) |
96.16 |
0.201 |
0.183 |
–0.67 |
1.020 |
| D202×CD |
–3.31***±0.47 |
0.96***±0.05 |
|
Y=1.018×exp (–3.31+0.96 ln (D202×CD)) |
96.54 |
0.191 |
0.174 |
–01.89 |
1.018 |
| Eq(7) |
DBH2×H; CD |
–3.63***±0.47 |
0.89***±0.10 |
0.59*±0.26 |
Y=1.009×exp (–3.63+0.89 ln (DBH2×H) + 0.59 ln (CD)) |
98.20 |
0.137 |
0.119 |
–09.02 |
1.009 |
| D202×H; CD |
–4.01***±0.67 |
0.88*** ±0.13 |
0.67ns ±0.33 |
Y=1.015×exp (–4.01+0.88 ln (D202×H) + 0.67 ln (CD)) |
97.09 |
0.175 |
0.151 |
–03.25 |
1.015 |