International Journal of Ecology

Research Article

Site-Species Allometry Equation for Theobroma cacao L. Biomass Estimation in Agroforestry Systems of Cameroon

Table 2

Statistical tests for model validity.


Models	Model expression	Shapiro–Wilk	value	Breusch–Pagan	value	Durbin–Watson	value

Aboveground biomass (AGB)
M1	lnB = −1.613 + 1.83 × ln (D)	0.968	0.194	2.564	0.109	2.348	0.875
M2	lnB = −1.398 + 1.12 × ln (D × C)	0.978	0.463	0.022	0.881	2.031	0.488
M3	lnB = −1.389 + 1.1 × ln (D × H)	0.986	0.809	2.12	0.145	1.830	0.226
M4	lnB = −1.501 + 0.69 × ln (D² × H)	0.988	0.874	2.920	0.087	1.860	0.259
M5	lnB = −1.533 + 0.70 × ln (D² × C)	0.979	0.512	0.197	0.657	2.143	0.653
M6	lnB = −1.594 + 1.63 × ln (D) + 0.36 × ln (C)	0.972	0.277	0.995	0.608	2.311	0.832
M7	lnB = −1.593 + 1.74 × ln (D) + 0.153 × ln (H)	0.977	0.423	6.946	0.031	1.908	0.313
M8	lnB = −1.513 + 0.65 × ln (D² × C) + c × ln (H)	0.983	0.697	3.864	0.145	1.945	0.367
M9	lnB = −1.583 + 1.56 × ln (D) + 0.10 × ln (H) + 0.35 × ln (C)	0.977	0.424	6.066	0.109	2.267	0.788

Belowground biomass (BGB)
M1	lnB = −2.611 + 1.65 × ln (D)	0.989	0.934	0.771	0.380	1.892	0.312
M2	lnB = −2.452 + 1.03 × ln (D × C)	0.979	0.513	2.795	0.09	2.067	0.541
M3	lnB = −2.375 + 0.98 × ln (D × H)	0.956	0.09	0.02	0.881	1.411	0.011
M4	lnB = −2.479 + 0.62 × ln (D² × H)	0.986	0.192	0.042	0.838	1.475	0.0201
M5	lnB = −2.564 + 0.64 × ln (D² × C)	0.980	0.559	2.318	0.128	1.728	0.136
M6	lnB = −2.574 + 1.33 × ln (D) + 0.55 × ln (C)	0.981	0.582	2.445	0.294	1.759	0.153
M7	lnB = −2.631 + 1.76 × ln (D)–0.160 × ln (H)	0.994	0.995	4.077	0.130	1.908	0.313
M8	lnB = −2.584 + 0.68 × ln (D² × C)–0.190 × ln (H)	0.979	0.495	4.887	0.087	1.684	0.105
M9	lnB = −2.603 + 1.48 × ln (D) + 0.245 × ln (H) + 0.57 × ln (C)	0.986	0.576	5.09	0.165	1.912	0.324

Total biomass (TB)
M1	lnB = −1.297 + 1.79 × ln (D)	0.976	0.401	1.328	0.249	2.308	0.842
M2	lnB = −1.083 + 1.10 × ln (D × C)	0.979	0.539	0.00066	0.974	1.999	0.444
M3	lnB = −2.375 + 0.98 × ln (D × H)	0.972	0.276	0.263	0.608	1.473	0.02
M4	lnB = −1.185 + 0.67 × ln (D² × H)	0.973	0.312	0.724	0.395	1.491	0.023
M5	lnB = −1.217 + 0.68 × ln (D² × C)	0.984	0.729	0.039	0.843	2.022	0.484
M6	lnB = −1.278 + 1.57 × ln (D) + 0.37 × ln (C)	0.974	0.323	0.455	0.796	2.229	0.747
M7	lnB = −1.276 + 1.71 × ln (D) + 0.135 × ln (H)	0.981	0.576	6.763	0.0340	1.59	0.05
M8	lnB = −1.207 + 0.64 × ln (D² × C) + 0.183 × ln (H)	0.982	0.654	5.4	0.067	1.768	0.152
M9	lnB = −1.268 + 1.52 × ln (D) + 0.08 × ln (C) + 0.37 × ln (H)	0.975	0.379	7.164	0.067	2.199	0.711