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 V

Multiple correlation analysis for the relationship between heartwood colour and plantation characteristics of Tectona grandis in Costa Rica (N = 267).

Wood properties	Multiple determination coefficient

	1st	2nd	3rd
Redness index (a*) sapwood	Tree age^**	–	–
r = 0.387¹	0.15
Lightness index (L*)	Tree age^**	DBH^**	–
r = 0.649	0.304²	0.101	–
Redness index (a*)	Tree age^**	Growth rate^**	DBH^**
r = 0.547	0.176	0.093	0.030
Yellowness index (b*)	Cluster^**	DBH^**	–
r = 0.844	0.698	0.014

^**

Statistically significant at 99% confidence level;

statistically significant at 95% confidence level;

Multiple correlation coefficient;

contribution; of the parameter to the coefficient of determination (r²).