Table 1. Main characteristics of forest plots.

	Acidophilous oak	Alpine coniferous	Beech	Boreal and hemiboreal	Broadleaved evergreen	Coniferous Mediterranean	Exotic plantations	Floodplain	Mesophytic deciduous	Non-riverine pioneer	Thremophilous deciduous
Number of plots (mono/ mixed)	14/105	5655/7064	563/1826	515/2504	7114/3285	9627/4294	1254/2358	43/162	2381/4167	110/644	692/888
Countries *	NL	SPA/FRA/SWI	FRA/NL/ SPA/SWI	NL/SWE/SWI	FRA/SPA	FRA/SPA	FRA/NL/SPA/ SWE/SWI	FRA/NL/SPA/SW	FRA/NL/SPA/SWI	FRA/NL/SPA/ SWE/SWI	SPA/SWI
Annual precipitation (mm)	811.8±28.7	910.3±302	1263±335.3	646.5±110.2	669.3±157.7	586.2±217.1	1262±409.5	1040.3±440.3	1052.2±291.4	831±336	726.2±214.9
Annual temperature (°C)	9.52±0.19	9.3±2.1	8.7±1.4	3.6±3	14±2.2	13.5±1.9	10.4±3.4	11.2±2.3	10.6±1.6	6±4.3	12±1.8
Dominant species	Betula pendula, Quercus robur	Abies alba, Pinus nigra, P. sylvestris	Fagus sylvatica	Picea abies, P. sylvestris	Quercus ilex, Q. suber	P. halepensis, P. pinaster, P. pinea	Eucalyptus globules, Picea abies, P. radiata	Alnus glutinosa, Populus nigra, Salix spp.	Q. petraea, Q. pubescens, Q. pyrenaica	Betula spp., Populus alba, Populus nigra, Populus tremula	Fraxinus angustifolia, Q. faginea
Stand basal área (m2/ha)	21.4±7.4	21.7±14	27.3±13.1	22±11	7.4±5.7	12.7±10.2	26.2±17.1	16.2±10.9	17.3±11.4	17.5±11.4	9.4±7.8
Plot size (ha)	0.05±0	0.08±0.06	0.09±0.07	0.03±0	0.12±0.07	0.1±0.06	0.07±0.06	0.12±0.07	0.07±0.06	0.05±0.04	0.1±0.07
Tree species richness/plot	3.3±1.3	1.8±1	2.6±1.3	2.2±0.7	1.4±0.6	1.4±0.7	2.2±1.3	3±1.8	2.3±1.4	2.6±1.2	1.8±0.9
Tree type richness/plot	1.5±0.5	1.4±0.5	1.4±0.5	1.7±0.5	1.3±0.5	1.2±0.5	1.5±0.5	1.3±0.5	1.3±0.5	1.6±0.5	1.5±0.6
Wood production (t/ha/yr)	2±2.3	2±1.7	3.1±2	2.5±2.1	0.49±0.47	1.2±1.3	4.4±4	2.6±2.1	2±1.67	2.6±2.1	0.7±0.7

^*Country nomenclature: France (FRA), The Netherlands (NL), Spain (SPA), Sweden (SWE) and Switzerland (SWI). Values indicate means (±SD).