Influence of tree species, tree diameter and soil types on wood density and its radial variation in a mid-altitude rainforest in Madagascar

Ramananantoandro, Tahiana; Ramanakoto, Miora F.; Rajoelison, Gabrielle L.; Randriamboavonjy, Jean C.; Rafidimanantsoa, Herimanitra P.

doi:10.1007/s13595-016-0576-z

Annals of Forest Science

Table 3 Linear model of the intra-tree wood density variation for the 23 species

From: Influence of tree species, tree diameter and soil types on wood density and its radial variation in a mid-altitude rainforest in Madagascar

Parameter	Estimate	Std. error	t value	Pr(>\|t\|)
(Intercept)	0.780	0.020	38.784	<2e−16	***
Distance to pith Dp	0.001	0.005	0.169	0.8662	–
Species sp
Syzygium cumini	0.113	0.032	3.513	0.0005	***
Dilobeia thouarsii	0.220	0.030	7.420	<0.001	***
Schefflera longipedicellata	−0.214	0.029	−7.294	<0.001	***
Anthocleista madagascariensis	0.139	0.027	5.048	<0.001	***
Ilex mitis	−0.158	0.028	−5.657	<0.001	***
Micronychia tsiramiramy	−0.215	0.029	−7.429	<0.001	***
Ocotea sp.(2)	−0.072	0.028	−2.552	0.0109	*
Ocotea sp.(1)	−0.121	0.031	−3.944	0.0001	***
Chrysophullum boivinianum	−0.102	0.027	−3.838	0.0001	***
Protorhus ditimena	−0.124	0.029	−4.273	<0.001	***
Dombeya lucida	−0.161	0.028	−5.806	<0.001	***
Ravensara crassifolia	0.014	0.029	0.474	0.6355	–
Harungana madagascariensis	−0.350	0.027	−13.015	<2e−16	***
Macaranga cuspidata	−0.336	0.034	−9.779	<2e−16	***
Bosqueia danguyana	0.011	0.029	0.390	0.6968	–
Schefflera vantsilana	−0.234	0.027	−8.577	<2e−16	***
Calophyllum sp.	−0.069	0.028	−2.438	0.0150	*
Nuxia capitata	0.099	0.029	3.387	0.0007	***
Mussaenda sp.	−0.292	0.033	−8.707	<2e−16	***
Erythroxyllum corymbosum	−0.068	0.033	−2.088	0.0372	*
Ravensara acuminata	0.047	0.028	1.711	0.0874	–
Albizia gummifera	−0.194	0.027	−7.169	<0.001	***
Interaction sp. × Dp
Syzygium cumini × Dp	−0.002	0.008	−0.237	0.8127	–
Dilobeia thouarsii × Dp	0.002	0.008	0.315	0.7529	–
Schefflera longipedicellata × Dp	−0.001	0.008	−0.085	0.9326	–
Anthocleista madagascariensis × Dp	−0.006	0.006	−1.152	0.2495	–
Ilex mitis × Dp	−0.002	0.007	−0.257	0.7976	–
Micronychia tsiramiramy × Dp	0.006	0.008	0.797	0.4256	–
Ocotea sp.(2) × Dp	0.011	0.007	1.524	0.1279	–
Ocotea sp.(1) × Dp	0.0001	0.007	0.027	0.9783	–
Chrysophullum boivinianum × Dp	−0.002	0.006	−0.240	0.8103	–
Protorhus ditimena × Dp	0.0001	0.007	−0.018	0.9860	–
Dombeya lucida × Dp	0.008	0.007	1.111	0.2669	–
Ravensara crassifolia × Dp	−0.010	0.008	−1.267	0.2054	–
Harungana madagascariensis × Dp	0.005	0.006	0.825	0.4093	–
Macaranga cuspidata × Dp	0.017	0.011	1.558	0.1197	–
Bosqueia danguyana × Dp	0.008	0.007	1.144	0.2530	–
Schefflera vantsilana × Dp	−0.003	0.006	−0.443	0.6577	–
Calophyllum sp. × Dp	0.006	0.007	0.870	0.3847	–
Nuxia capitata × Dp	0.003	0.007	0.342	0.7328	–
Mussaenda sp. × Dp	0.001	0.009	0.135	0.8925	–
Erythroxyllum corymbosum × Dp	0.011	0.009	1.244	0.2140	–
Ravensara acuminata × Dp	−0.002	0.007	−0.338	0.7358	–
Albizia gummifera × Dp	0.001	0.006	0.115	0.9085	–
Residual standard error: 0.06387
Multiple R-squared: 0.841, Adjusted R-squared: 0.8321
F-statistic: 94.95, p value: <2.2e−16

p values for sp. and sp. × Dp test are for significant differences relative to Uapaca densifolia
R²(Species) = 83.6 %, R²(Distance to pith) = 0.05 %, R²(species × Distance to pith) = 0.05 %
Wood density is in g.cm-3
***significant at the 0.1 % level, **significant at the 1 %, *significant at the 5 %, – non significant

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