Development and evaluation of an individual tree growth and yield model for the mixed species forest of the Adirondacks Region of New York, USA

Weiskittel, Aaron; Kuehne, Christian; McTague, John Paul; Oppenheimer, Mike

doi:10.1186/s40663-016-0086-3

Forest Ecosystems

Table 7 Results of the equivalence test of the Northeast (NE) variants of FVS for height increment and the parameter estimates and fit statistics for Eq. [4]. Mean bias (MB; observed – predicted) and root mean square error (RMSE) by species are presented. Both mean difference and MB were computed as observed – predicted. The null hypothesis for the equivalence test is that μ₁ ≠ μ₂. Columns marked with an asterisk (*) were those that were treated as a random effect and presented as the fixed + species random effect

From: Development and evaluation of an individual tree growth and yield model for the mixed species forest of the Adirondacks Region of New York, USA

SPP^a	N	FVS–NE		Equation [4]
SPP^a	N	Mean ± SE difference (m)	Result of equivalence test	b ₄₀*	b ₄₁*	b ₄₂	b ₄₃	b ₄₄	b ₄₅	b ₄₆	MB (m)	RMSE (m)
AB	331	0.059 ± 0.010	not rejected	–2.0016	–0.1519	0.8261	–0.0583	–0.0121	–0.0049	0.3741	0.0009	0.1640
AS	60	0.168 ± 0.020	not rejected	–2.4663	–0.1134	0.8261	–0.0583	–0.0121	–0.0049	0.3741	0.0171	0.1555
BC	58	–0.011 ± 0.020	not rejected	–2.6260	–0.1227	0.8261	–0.0583	–0.0121	–0.0049	0.3741	–0.0081	0.1399
BF	30	0.102 ± 0.042	not rejected	–2.7233	–0.1037	0.8261	–0.0583	–0.0121	–0.0049	0.3741	0.0253	0.1537
EH	308	0.001 ± 0.008	rejected	–2.8409	–0.1169	0.8261	–0.0583	–0.0121	–0.0049	0.3741	–0.0042	0.1337
OH	48	0.133 ± 0.025	not rejected	–2.7560	–0.1111	0.8261	–0.0583	–0.0121	–0.0049	0.3741	0.0231	0.1820
OS	85	0.029 ± 0.021	not rejected	–2.7532	–0.1081	0.8261	–0.0583	–0.0121	–0.0049	0.3741	0.0004	0.1471
QA	14	0.134 ± 0.061	not rejected	–2.6734	–0.1114	0.8261	–0.0583	–0.0121	–0.0049	0.3741	0.0189	0.2232
RM	304	0.058 ± 0.011	not rejected	–2.4157	–0.1284	0.8261	–0.0583	–0.0121	–0.0049	0.3741	0.0142	0.1801
RN	122	0.094 ± 0.015	not rejected	–2.8316	–0.0979	0.8261	–0.0583	–0.0121	–0.0049	0.3741	0.0110	0.1636
RO	35	0.033 ± 0.025	not rejected	–3.0972	–0.1040	0.8261	–0.0583	–0.0121	–0.0049	0.3741	–0.0314	0.1420
SM	592	0.093 ± 0.006	not rejected	–2.5667	–0.1180	0.8261	–0.0583	–0.0121	–0.0049	0.3741	0.0024	0.1436
SP	203	–0.023 ± 0.010	not rejected	–3.1431	–0.1069	0.8261	–0.0583	–0.0121	–0.0049	0.3741	–0.0094	0.1235
WC	12	0.043 ± 0.035	not rejected	–2.8164	–0.1139	0.8261	–0.0583	–0.0121	–0.0049	0.3741	–0.0481	0.1123
WP	122	0.141 ± 0.015	not rejected	–3.1466	–0.0836	0.8261	–0.0583	–0.0121	–0.0049	0.3741	0.0087	0.1596
YB	412	0.090 ± 0.007	not rejected	–2.0130	–0.1526	0.8261	–0.0583	–0.0121	–0.0049	0.3741	0.0010	0.1277

^a SPP Species are AB American beech, AS ash, BC black cherry, BF balsam fir, EH eastern hemlock, OH other hardwoods, OS other softwoods, QA quaking aspen, RM red maple, RN red pine, RO red oak, SM sugar maple, SP spruce, WC white cedar, WP white pine, and YB yellow birch

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