Forest Ecosystems

Table 1 Summary of data used to develop dry weight biomass models. Note that plots where a target species, sp, is studied, other pine species could be present

From: Stand-level biomass models for predicting C stock for the main Spanish pine species

sp		Initial SNFI survey						Final SNFI survey
sp		N_{sp_I}	N_I	V_{sp_I}	V_I	W_{sp_I}	f_{sp_I}	N_{sp_F}	N_F	V_{sp_F}	V_F	W_{sp_F}	f_{sp_F}	M
Ps (# 1854)	Mean	753	846	109.7	121.9	109.7	0.51	794	909	159.2	178.3	147.3	0.50	51
	sd	544	560	91.6	90.8	69.1	0.07	570	588	108.5	104.1	80.6	0.06	14
	Min	14	46	3.0	17.1	5.1	0.35	14	56	5.8	26.3	8.0	0.37	23
	Max	3692	4106	747.4	747.4	520.3	1.11	4297	4311	826.8	843.2	574.5	0.93	118
Pp (# 537)	Mean	337	386	51.5	59.4	66.8	0.51	348	405	76.1	88.3	92.7	0.48	24
	sd	357	376	38.6	39.1	40.2	0.14	369	387	49.8	50.1	50.6	0.1	5
	Min	5	20	1.7	11.8	3.6	0.18	5	31	2.0	17.1	3.8	0.23	12
	Max	3102	3197	350.4	350.4	335.4	1.65	3233	3233	406.0	406.0	392.3	1.24	45
Ph (# 2039)	Mean	491	516	37.3	39.5	37.4	0.52	546	579	56.9	60.3	57.6	0.48	21
	sd	348	352	24.5	25.3	23.0	0.14	377	381	35.5	36.8	33.5	0.09	6
	Min	5	25	2.8	4.8	2.6	0.29	5	25	3.3	7.5	3.2	0.21	7
	Max	2465	3006	238.2	241.4	194.6	1.84	2451	2798	283.0	287.6	242.9	1.18	52
Pn (# 1414)	Mean	703	837	75.8	90.6	83.8	0.54	749	909	111.1	133.5	117.2	0.53	38
	sd	586	604	61.8	62.5	59.6	0.09	615	629	78.9	77.2	74.1	0.07	10
	Min	10	41	1.4	17.8	2.7	0.35	10	41	2.3	22.5	4.0	0.29	20
	Max	4994	4994	522.8	522.8	451.7	1.22	4623	4623	577.4	577.4	552.4	1.65	105
Pt (# 1358)	Mean	532	604	94.8	103.5	71.3	0.51	550	640	149.5	163.1	108.6	0.49	33
	sd	443	466	64.8	66.5	44.1	0.07	443	472	88.8	87.8	57.7	0.06	12
	Min	10	51	1.4	19.3	1.2	0.33	10	40	6.2	30.8	5.5	0.35	17
	Max	3310	3310	515.6	562.5	332.8	0.89	2886	2886	652.4	652.4	475.3	0.91	87

N, is the total number of trees per hectare while N_sp represents the number of trees of the main species; V, is the total volume and V_sp main species volume, both in m³·ha^− 1; W_sp is the main species dry weight of biomass in Mg·ha^− 1; f_sp, is the species stand form factor, calculated as in Eq. 5; and M is the Martonne aridity index in mm·°C^− 1. The subscript “I” refers to initial survey and “F” to final survey. Ps Pinus sylvestris, Pp P. pinea, Ph P. halepensis, Pn P. nigra, and Pt P. pinaster. The number of plots used to develop models is shown under the name of the target species (#)

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