Table 1. Regressions of dry weights (kg) on different components in P. densiflora saplings. Y: dry weights of tree component (kg), RCD: root collar diameter (cm), DBH: diameter at breast height (cm), H: height (m), CW: crown width (m).

Model	Component	a	b	c	R²	RMSE
Y = a × RCD^b	Stem	0.0016^**	3.1010^***		0.9774	0.1136
	Branch	0.0044^*	2.8775^***		0.9673	0.2181
	Foliage	0.0270^**	2.0946^***		0.9693	0.1924
	Root	0.0061^*	2.4351^***		0.9777	0.0941
	Total	0.0342^**	2.4866^***		0.9863	0.4737
Y = a × RCD^b × H^c	Stem	0.0221	1.3960^**	1.1180^***	0.9907	0.0727
	Branch	0.0113	2.2549^**	0.4142	0.9693	0.2112
	Foliage	0.0228	2.2111^***	−0.0847	0.9694	0.1918
	Root	0.0166	1.7787^*	0.4443	0.9807	0.0877
	Total	0.0748	1.9713^**	0.3471	0.9878	0.4459
Y = a × DBH^b	Stem	0.1720^***	1.5360^***		0.9445	0.1779
	Branch	0.3310^***	1.4250^***		0.9041	0.3733
	Foliage	0.6295^***	1.0335^***		0.8807	0.3790
	Root	0.2279^**	1.2251^***		0.8803	0.2182
	Total	1.3400^**	1.2680^***		0.9101	1.2123
Y = a × DBH^b × H^c	Stem	0.1718^***	0.5225^**	1.4000^***	0.9869	0.0865
	Branch	0.3199^***	0.5184	1.2830^*	0.9419	0.2905
	Foliage	0.5769^***	0.4725	0.8589	0.9049	0.3384
	Root	0.2232^***	0.0937	1.5847^*	0.9462	0.1463
	Total	1.3246^***	0.3106	1.3367^*	0.9550	0.8581
Y = a + bCW	Stem	−0.9804^***	1.0187^***		0.9512	0.1668
	Branch	−1.5094^***	1.6304^***		0.9557	0.2539
	Foliage	−0.9279^**	1.4555^***		0.9192	0.3120
	Root	−0.5895^***	0.7665^***		0.9794	0.0905
	Total	−4.0194^***	4.9261^***		0.9843	0.5067

for p < 0.001, and
for p < 0.01
for p < 0.05.