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

Table 6

Parameter estimates and performance of general and site specific models for biomass of tree sections.

Section	General/sites	Model	Parameter estimates			Error	RMSE		AIC
			Tree branches	General	6					0.1379	2.1738		0.027 × dbh^2.456	846.89	0.39	823.10
7	−1.6031	0.2524				0.042 × dbh^2.345	677.87	0.41	826.66
8	0.1364	2.1697			0.0088	0.028 × dbh^2.451	842.13	0.39	825.08
9	0.0434	0.8868				0.047 × dbh^2.319	757.86	0.40	828.52
10	0.0270	0.9887				0.075 × dbh^2.118	441.72	0.75	795.70
Dindili	6	0.1173		2.2750		0.023 × dbh^2.441	370.47	0.75	383.04
	7	−2.5456		0.3211		0.033 × dbh^2.375	285.20	0.76	391.26
	8	0.1604		2.35962	−0.2205	0.022 × dbh^2.455	368.64	0.76	384.92
	9	0.0483		0.9083		0.032 × dbh^2.380	420.12	0.62	390.90
	10	0.04624		0.9549		0.020 × dbh^2.510	296.64	0.72	388.60
Rondo	6	0.1343		2.0777		0.046 × dbh^2.277	619.55	0.46	422.6
	7	0.1403		0.9548		0.041 × dbh^2.303	620.00	0.46	421.78
	8	0.000007		0.5631	4.9456	0.141 × dbh^1.890	531.55	0.64	405.46
	9	0.0288		0.8912		0.047 × dbh^2.249	594.47	0.51	416.26
	10	0.05347		0.8840		0.205 × dbh^1.763	345.94	0.85	394.66
Tree stem	General	6	0.3859	1.7794		0.135 × dbh^1.994	570.48	0.49	811.60
		7	−1.0523	0.2482		0.109 × dbh^2.053	618.81	0.49	811.76
		8	0.07646	1.5073	1.0172	0.203 × dbh^1.859	472.48	0.62	803.40
		9	0.1683	0.7287		0.174 × dbh^1.903	494.66	0.60	801.86
		10	0.0848	0.8726		0.333 × dbh^1.658	259.49	0.85	772.30
	Dindili	6	0.2451	2.0119		0.086 × dbh^2.108	358.30	0.56	390.86
		7	−1.1567	0.2895		0.103 × dbh^2.059	343.87	0.57	390.92
		8	0.0395	1.3879	1.4583	0.181 × dbh^1.825	212.42	0.84	377.04
		9	0.0869	0.8392		0.118 × dbh^1.963	260.6	0.77	388.60
		10	0.0853	0.8798		0.108 × dbh^1.994	277.39	0.68	380.18
	Rondo	6	0.3944	1.7607		0.200 × dbh^1.869	549.37	0.49	417.66
		7	−5.4258	0.2147		0.104 × dbh^2.043	668.71	0.48	422.10
		8	0.0278	1.2617	1.5116	0.344 × dbh^1.694	441.80	0.67	412.20
		9	0.0808	0.8026		0.213 × dbh^1.830	493.90	0.59	412.35
		10	0.06812	0.8888		0.779 × dbh^1.395	271.52	0.89	391.32