Heartwood and sapwood allometry of seven Chinese temperate tree species

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Table II

Correlation coefficients between heartwood and sapwood parameters across the seven tree species. The parameters examined includes cambial age (CA, y), stem diameter at breast height (DBH, cm), heartwood radius (HR, cm), sapwood width (SW, cm), heartwood formation rate (HFR, rings y⁻¹), heartwood initiation age (HIA, y), heartwood volume ratio (HVR), sapwood ring number (SRN), sapwood ring longevity (SRL, y), mean first decadal ring width (MFRW, cm), mean last decadal ring width (MLRW, cm), and mean sapwood ring width (MSRW, cm). The HR, SW, SRN, and ring widths are all at breast height.

Parameter	DBH	HR	SW	HFR	HIA	HVR	SRN	SRL	MFRW	MLRW	MSRW
CA	0.67^**	0.71^**	NS	0.60^**	0.49^*	0.73^**	NS	NS	NS	NS	NS
	(38)	(38)	(38)	(37)	(37)	(38)	(38)	(37)	(38)	(38)	(38)
DBH		0.98^**	0.58^**	NS	NS	0.27^*	NS	NS	0.32^*	0.51^**	0.62^**
		(63)	(63)	(37)	(37)	(63)	(38)	(37)	(38)	(38)	(38)
HR			0.49^**	0.35^*	NS	0.35^**	NS	NS	NS	0.47^**	0.57^**
			(63)	(37)	(37)	(60)	(38)	(37)	(38)	(38)	(38)
SW				NS	NS	–0.47^**	0.38^*	NS	0.67^**	0.56^**	0.64^**
				(37)	(37)	(60)	(38)	(37)	(38)	(38)	(38)
HFR					0.44^**	0.65^**	–0.69^**	–0.73^**	–0.57^**	NS	NS
					(37)	(37)	(37)	(37)	(37)	(37)	(37)
HIA						NS	NS	NS	–0.42^**	NS	NS
						(37)	(37)	(37)	(37)	(37)	(37)
HVR							–0.46^**	–0.60^**	NS	NS	NS
							(38)	(37)	(38)	(38)	(38)
SRN								0.95^**	0.33^*	–0.40^*	NS
								(37)	(38)	(38)	(38)
SRL									NS	–0.45^**	–0.36^*
									(37)	(37)	(37)

^{**, *}

and NS stand for highly significant (α = 0.01), significant (α = 0.05), and insignificant (α > 0.05), respectively. The values in the parentheses are sample size.