Comparing volume growth in pure and mixed stands of Pinus sylvestris and Quercus pyrenaica

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Table III

Main stand variables of mixed species plots by species and total, used to fit equation (13) (data from 2nd and 3rd SNFI). N - Natural stands; P - Plantation stands.

Species	Origin	N°	Statistic	No.	H_dom	G	I_V	A^*	P^*	I_Vp^*
		plots		trees ha⁻¹	(m)	(m² ha⁻¹)	(m³ ha⁻¹ y⁻¹)			(m³ ha⁻¹ y⁻¹)
Pinus sylvestris	N	39	Mean	569	13.3	17.4	4.6	0.28	0.63	7.9
Pinus sylvestris	N	39	std	r 681.9	r 3.3	8.1	4.0	0.13	0.20	6.5
			Min	36	7.0	3.6	0.4	0.06	0.19	0.5
			Max	2915	19.3	38.8	19.4	0.61	0.96	22.4
	P	42	Mean	796	7.5	10.4	7.0	0.19	0.55	13.9
	P	42	std	447.4	2.7	6.8	4.1	0.11	0.21	7.8
			Min	36	4.0	1.9	0.5	0.04	0.19	1.8
			Max	1733	16.1	32.8	18.0	0.52	0.91	34.5
	Total	81	Mean	687	10.3	13.7	5.8	0.23	0.59	11.0
	Total	81	std	580.1	4.2	8.2	4.2	0.13	0.21	7.8
			Min	36	4.0	1.9	0.4	0.04	0.19	0.5
			Max	2916	19.3	38.8	19.4	0.61	0.96	34.5

Quercus pyrenaica		81	Mean	496	8.6	6.2	1.3	0.17	0.41	3.9
Quercus pyrenaica		81	std	453.9	2.7	5.1	1.2	0.13	0.21	4.1
			Min	25	4.0	0.5	0.01	0.01	0.04	0.01
			Max	1974	15.8	23.6	4.9	0.59	0.81	16.7

P. sylvestris		81	Mean	1182		20.0	7.1	0.40
+Q. pyrenaica		81	std	825.0		10.0	4.8	0.19
			Min	71		4.0	0.8	0.10
			Max	3813		46.1	21.3	0.94

A , P , I_Vp according to Table .