Wood colour variation in sapwood and heartwood of young trees of Tectona grandis and its relationship with plantation characteristics, site, and decay resistance

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Table III

Pearson correlation coefficients for the relationship between colour parameters and plantation characteristics of Tectona grandis in Costa Rica.

Plantation characteristics	CIELab parameters in sapwood (N = 127)			CIELab parameters in heartwood (N = 267)

	L*	a*	b*	L*	a*	b*
Tree age	–0.13^ns	0.38^**	0.09^ns	–0.55^**	0.42^**	0.26^*
Tree height	–0.09^ns	0.31^*	–0.08^ns	–0.28^*	0.20^ns	0.31^ns
DBH	–0.00^ns	0.14^ns	–0.04^ns	–0.40^**	0.38^**	0.38^**
Growth rate	0.15^ns	–0.38^**	–0.16^ns	0.41^**	–0.30^*	–0.06^ns
Plantation density	0.05^ns	–0.33^*	–0.09^ns	0.30^*	–0.22^ns	0.20^ns
Cluster	–0.23^ns	0.18^ns	–0.15^ns	–0.09^ns	0.16^ns	0.84^**

^**

Statistically significant at 99% confidence level;

statistically significant at 95% confidence level;

^ns

not significantly different, DBH: diameter at breast height.