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

Table 16

Allometric equations for estimating TTB using combination of DBH and HT (DBHHT = P).

Function	Equation	MRE	R^2	SEE
Exponential	TTB= 23.48e^0.006P	-7.61	0.73	6.67
Logarithmic	TTB= 107.7ln(P) - 339.7	0.002	0.72	2.85
Polynomial	TTB = -0.000P^2 + 1.11P–2.05	-4.02	I	2.52
Linear	TTB = 0.829P–0.929	0.06	0.90	1.58
Power	TTB= 0.395P^1.125	2.15	0.98	2,68