Generalized biomass equations for the main aboveground biomass components of maritime pine across contrasting environments

Table 2 Values of parameters of the allometric equations fitted to the biomass data set collected over ten sites across France and Tunisian sites (n = 178 trees), together with their asymptotic standard error (smaller font)

Component	Model	a		b		c		d		Sum of squares		Normality (p value K–S test)
Component	Model	a		b		c		d		Total	Residual	Normality (p value K–S test)
Buds	aD ^b	9	2	2.17	1.79					873	242	0.13
Cones	aD ^b	171	92	2.71	0.52					154,245	73,660	<0.01
Needle	aD ^b	142	33	1.65	0.11					1,105,270	241,992	>0.15
	aD ^b H ^d	1,131	683	2.09	0.22			−0.57	0.21		222,402	>0.15
	aD ^b age ^c	1,916	428	2.07	0.09	−0.67	0.05				80,428	>0.15
Branch wood	aD ^b	509	74	2.19	0.08					2,285,826	275,719	0.06
	aD ^b H ^d	6,849	3,663	2.81	0.19			−0.66	0.18		244,849	0.05
	a D ^b age ^c	1,883	543	2.47	0.09	−0.29	0.06				221,425	0.14
Stem	aD ^b	5,041	260	2.70	0.04					52,593,167	1,725,507	0.01
	aD ^b H ^d	334	166	2.17	0.08			0.59	0.09		1,272,376	0.01
	aD ^b age ^c	2,225	215	2.56	0.03	0.19	0.02				1,119,912	0.02
Stemwood	aD ^b	4,846	303	2.82	0.04					30,603,380	1,069,968	0.08
	aD ^b H ^d	317	184	2.19	0.10			0.70	0.11		794,748	0.12
	aD ^b age ^c	2,319	414	2.67	0.05	0.16	0.04				867,771	0.09
Stembark	aD ^b	419	46	2.20	0.06					1,518,394	117,543	<0.01
Total aboveground	aD ^b	5,013	202	2.48	0.03					105,700,000	1,896,108	>0.15
	aD ^b H ^d	3,177	858	2.38	0.07			0.12	0.07		1,864,507	0.11
	aD ^b age^c	4,445	408	2.46	0.03	0.03	0.02				1,873,048	>0.15

Total and residual sum of squares of each model are given and p value of the Kolmogorov-Smirnov’s test of normality for the residual distribution (p values lower than .05 indicate a departure from a normal distribution). The parameter values of the models shown in Fig. 1 are in bold

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