Allometric Models for Estimating Tree Volume and Aboveground Biomass in Lowland Forests of Tanzania

Table 3

Parameter estimates and volume models performance for individual total tree and sectional volume.

Section	General/site specific	Model	Parameter estimates			Error	RMSE		AIC
			Total tree volume	General	6						2.1620	—	0.013 × dbh^0.5	0.90	0.95	92.32
7		0.00102			—	0.013 × dbh^0.5	0.85	0.95	92.06
8		2.3488			0.3848	0.013 × dbh^0.5	0.90	0.95	91.64
9		0.9039			—	0.014 × dbh^0.5	1.10	0.92	107.42
Dindili forest	7			0.00090		0.014 × dbh^0.5	0.72	0.88	45.82
	8			2.5042	0.4329	0.012 × dbh^0.5	0.74	0.89	39.36
Rondo forest	7			0.0010		0.011 × dbh^0.5	0.87	0.96	46.92
	8			2.3176	0.1854	0.010 × dbh^0.5	0.92	0.96	45.34
Tree branch volume	General	6		2.1658	—	0.013 × dbh^0.5	0.84	0.78	88.74
		7		0.00031	—	0.013 × dbh^0.5	0.82	0.78	88.58
		8		2.5514	−0.1277	0.012 × dbh^0.5	0.83	0.79	89.78
		9		0.8901	—	0.014 × dbh^0.5	0.90	0.73	99.72
	Dindili forest	7		0.00046		0.013 × dbh^0.5	0.60	0.70	39.66
		8		2.9229	−0.3903	0.012 × dbh^0.5	0.70	0.69	38.26
	Rondo forest	7		0.00033		0.011 × dbh^0.5	0.80	0.84	45.72
		8		2.5642	−0.0659	0.010 × dbh^0.5	0.80	0.87	43.14
Tree stem volume	General	6		2.1452	—	0.028 × dbh^0.5	0.68	0.89	47.90
		7		0.00052	—	0.009 × dbh^0.5	0.65	0.90	47.74
		8		2.1611	0.5517	0.008 × dbh^0.5	0.65	0.90	38.70
		9		0.9088	—	0.008 × dbh^0.5	0.67	0.89	40.18
	Dindili forest	7		0.00047		0.008 × dbh^0.5	0.42	0.79	33.9
		8		2.0392	1.2855	0.007 × dbh^0.5	0.36	0.86	4.3
	Rondo forest	7		0.00059		0.009 × dbh^0.5	0.83	0.90	33.94
		8		2.1685	0.3038	0.009 × dbh^0.5	0.83	0.90	35.3