Forest Ecosystems

Table 3 Regression parameters and level of significance for the smoothers for selected tree and crown dimensions according to eq. 4

From: Analysing the effect of stand density and site conditions on structure and growth of oak species using Nelder trials along an environmental gradient: experimental design, evaluation methods, and results

	h			d			v			cl			csa			cv
	Est.	Std. E.	p	Est.	Std. E.	p	Est.	Std. E.	p	Est.	Std. E.	p	Est.	Std. E.	p	Est.	Std. E.	p
β ₀	115.0	1.01	***	22.82	0.18	***	0.0002	0.00006	***	87.29	1.01	***	0.26	0.007	***	−0.17	0.31
β ₁(651)	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	1.13	0.53	*
β ₂(653)	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	0.26	0.50
f ₁(DCI, 650)			***			***						***
f ₂(DCI, 651)			***			***			***			***			***			***
f ₃(DCI, 653)						***			***						***			***
g(E, N)			***			***			***			***			***			**

h tree height, d diameter at root collar, v tree volume, cl crown length, csa crown cross section area, cv crown volume, DCI Hegyi-index, N northing, E easting, ^. p-value < 0.1, * p-value < 0.05, ** p-value < 0.01, *** p-value < 0.001

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