Intra- and interspecific competition differently influence growth and stem quality of young oaks (Quercus robur L. and Quercus petraea (Mattuschka) Liebl.)

Table 2 Design characteristics of cluster planting sites. Average size of the studied stands was 1 ha. No trainer trees were planted inside nests. Note, the initial spacing between seedlings vary significantly between the nests and groups but not within the cluster type

Location	Altenheim	Gerlingen	Gerchsheim	Kaisereiche	Königheim	Lerchenfeld	Leonberg
Cluster type	Group	Nest	Nest	Group	Nest	Group	Nest
Oak species planted	Quercus robur	Quercus robur	Quercus robur	Quercus petraea	Quercus petraea	Quercus petraea	Quercus robur
Age	10	26	22	20	22	20	23
Spacing between oaks in cluster (m)	1 × 1	0.3 × 0.3	0.25 × 0.25	1 × 1	0.25 × 0.25	1 × 1	0.3 × 0.3
Clusters ha⁻¹	70	180	200	100	200	100	150
Oaks cluster⁻¹	19	21	21	27	21	27	21
Trainers cluster⁻¹	12			15		15
Trainer species	Tilia cordata, Carpinus betulus			Fagus sylvatica		Fagus sylvatica

ISSN: 1297-966X