Polyculture affects biomass production of component species but not total standing biomass and soil carbon stocks in a temperate forest plantation

Table 2 Allometric equations for B. pendula, A. glutinosa and F. sylvatica to estimate woody biomass

Plant species	Tree variables	Equations (Y = a x^b)	R ²	F	P	RMSE
*B. pendula*	DBH (mm)	Y = 0.0008 D^2.2322	0.9938	1285.70	< 0.0001	0.3459
	Basal diameter (mm)	Y = 0.0002 d^2.3893	0.9970	2746.41	< 0.0001	0.2370
	Branch dry weight (kg)	Y = 4.4302 b^0.7502	0.9345	114.18	< 0.0001	1.1256
	Tree height (m)	Y = 0.0001 h^5.8014	0.8773	57.227	< 0.0001	1.5406
*A. glutinosa*	DBH (mm)	Y = 0.0006 D^2.2775	0.9946	1491.32	< 0.0001	0.3807
	Basal diameter (mm)	Y = 0.0001 d^2.6453	0.9884	682.81	< 0.0001	0.5610
	Branch dry weight (kg)	Y = 6.3385 b^1.2229	0.9297	105.93	< 0.0001	1.3815
	Tree height (m)	Y = 0.0048 h^3.5841	0.7898	30.07	< 0.0006	2.3900
*F. sylvatica*	DBH (mm)	Y = 0.0071 D^1.6883	0.9836	480.28	< 0.0001	0.2151
	Basal diameter (mm)	Y = 0.0002 d^2.5770	0.9847	517.46	< 0.0001	0.2073
	Branch dry weight (kg)	Y = 2.8883 b^0.8845	0.841	42.32	< 0.0002	0.6706
	Tree height (m)	Y = 0.0396 h^2.8864	0.7189	20.47	< 0.0019	0.8912

General power model Y = a x^b was used, where Y is the woody biomass (kg) of plant, x is the tree variables, i.e. D, d, b and h denoting DBH (at 1.3 m above the ground level), basal diameter (at 22.5 cm), branch dry weight and tree height, respectively, a and b are regression coefficients
RMSE, root mean square error

ISSN: 1297-966X