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

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Table I

Main stand variables of plots used to fit the equation (9) (data from 2nd SNFI). N - Natural stands; P - Plantation stands.

Species	Region	Origin	No.plots	Statistic	No.	H_dom	Dg	G
			No.plots		trees ha⁻¹	(m)	(cm)	(m² ha⁻¹)
		N	164	Mean	733	17.9	29.5	36.3
	1	N	164	std	657.5	4.7	9.7	12.3
	1			Min	129	8.2	10.9	16.9
				Max	5126	28.2	51.8	84.5

pinus sylvestris		P	98	Mean	1452	10.6	17.9	32.7
pinus sylvestris		P	98	std	659.3	2.9	4.6	11.2
				Min	349	5.9	9.7	15.2
				Max	3547	20.5	37.1	60.8

		N	304	Mean	755	16.4	27.9	35.9
	2	N	304	std	534.6	4.0	8.4	11.9
	2			Min	130	5.0	10.8	15.7
				Max	3530	27.8	51.5	76.5

		P	164	Mean	1379	11.5	19.3	31.8
		P	164	std	732.5	4.1	7.3	10.7
				Min	268	5.2	9.7	14.9
				Max	3756	22.7	40.8	59.8

	1		193	Mean	738	8.1	13.3	8.3
Quercus pyrenaica	1		193	std	759.8	2.5	6.0	7.4
Quercus pyrenaica				Min	78	3.6	7.6	0.6
				Max	4170	16.9	50.3	34.0

	2		388	Mean	862	8.7	14.7	12.2
	2		388	std	724.0	2.9	7.3	9.2
				Min	79	2.5	7.5	0.6
				Max	3756	17.4	51.8	45.9