Evaluating the behaviour of vertical structure indices in Scots pine forests

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Table IV

Correlation matrix of the vertical structure indices for the final sample size of 0.5 ha: H′, Shannon’s index; STVI, structure index based on the variance; SQRI, structure index based on the sum of square roots; DH3, Gadow’s index for height and 3 neighbours; SCI, structure complexity index; SD, standard deviation of tree heights (Tab. I).

	H′	STVI	SQRI	DH3	SCI	SD
H′	1
STVI	0.8300^*	1
SQRI	0.8964^**	0.8382^**	1
DH3	0.6229^*	0.6621^*	0.6280^*	1
SCI	0.7718^**	0.6109^**	0.8596^**	0.7326^**	1
SD	0.8409^**	0.8101^**	0.7231^**	0.4751	0.5594^*	1

Indicates significant correlation at 0.05 level and

^**

indicates significant correlation at 0.01 level.