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 VI

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

Type of	Colour	Trametes	Pycnoporus
wood	coordinates	versicolor	sanguineous
All samples: sapwood	L*	0.66^**	0.64^**
and heartwood	a*	–0.65^**	–0.62^**
(N = 394)	b*	0.10^ns	0.07^ns

Sapwood	L*	0.43^*	0.16^ns
(N = 127)	a*	–0.62^**	–0.32^*
	b*	0.19^ns	0.08^ns

Heartwood	L*	0.55^**	0.47^*
(N = 267)	a*	–0.44^*	–0.33^*
	b*	0.07^ns	0.07^ns

^**

Statistically significant at 99% confidence level;

statistically significant at 95% confidence level;

^ns

not significantly different.