Chemical properties of wood are under stronger genetic control than growth traits in Populus tomentosa Carr.

Table 4 Summary of results of analyses of variance and estimated repeatabilities (±standard errors) for tree growth and wood chemical properties at the four sites combined

Trait	P value			R _b ²	R _c ²	%
Trait	Clones	Sites	Sites × clones	R _b ²	R _c ²	%
Tree height	0.002	0.006	<0.001	0.232 ± 0.104	0.771 ± 0.0913	56.5
DBH	0.011	<0.001	0.001	0.152 ± 0.0811	0.696 ± 0.0706	50.6
Stem volume	0.027	<0.001	<0.001	0.144 ± 0.0786	0.633 ± 0.859	40.5
Extractives	0.001	<0.001	0.041	0.315 ± 0.133	0.799 ± 0.0856	65.3
Holocellulose	0.019	0.030	0.561	0.146 ± 0.0968	0.659 ± 0.117	41.4
Lignin	<0.001	0.001	0.006	0.357 ± 0.108	0.811 ± 0.0816	66.2

% estimated ratio of clonal variance to the sum of clonal plus clone × site variances, DBH diameter at breast height

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