Table 4.

The explanatory variables selected and the results of GLM (DCA axis 1 value: n = 288; crown porosity from hemispherical photographs: n = 96).

Response variables	Order	Regression coefficients				AIC	RMSE	Pearson’s correlation coefficients between estimated and measured values
Response variables	Order	Intercept	V_FO	VL_LO	VO_VFVO	AIC	RMSE
DCA axis 1 score	1	1.443			−3.804	696.66	0.803	r = 0.600 (p < 0.001)
	2	1.916	−0.307		−3.904	696.68
	3	−0.477	0.337			823.82
Crown porosity	1	−0.618			−2.128	48.53	0.060	r = 0.643 (p < 0.001)
	2	−1.254		−0.775		50.08
	3	−0.435	−0.743		−2.126	50.19