Allometric Equations for Estimating Silk Oak (Grevillea robusta) Biomass in Agricultural Landscapes of Maragua Subcounty, Kenya

Table 6

Allometric equations for estimating various biomass using DBH.

Function	Equations	MRE	R^2	SEE
Exponential	TTB = 10.91e^0.150DBH	-29.10	0.84	4.57
Power	TTB = 1.811DBH^1.658	5.05	0.98	1.34
Polynomial	TTB = 0.322DBBH^2+7.93DBH-19.26	0.15	0.93	1.33
Linear	TTB= 18.00DBH - 73.22	0.07	0.91	1.52
Multiple	TTB = 11.356DBH – 8.924HT + 0.536(DBHHT) + 18.27	-0.16	0.93	1.40
Exponential	AGB=8.474e^0.150DBH	-22.60	0.83	3.56
Power	AGB=1.384DBH^1.665	3.2	0.98	0.99
Linear	AGB=13.99DBH - 56.96	0.02	0.92	1.12
Polynomial	AGB=0.248DBH^2+ 6.243DBH – 15.45	0.002	0.94	0.99
Multiple	AGB=8.641DBH – 6.9HT + 0.424(DBHHT) + 14.53	0.06	0.90	1.98
Exponential	BGB = 2.311e^0151DBH	-5.13	0.82	1.04
Polynomial	BGB = 0.074DBH^2+1.688DBH – 3.791	0.10	0.82	0.50
Linear	BGB = 4.013DBH - 16.24	-0.01	0.81	0.53
Multiple	BGB =2.713DBH – 2.028HT + 0.111(DBHHT) +3.79	0.10	0.82	0.51
Power	BGB = 0.401DBH^1.642	3.42	0.93	0.51