Growth and development of young beech and spruce mixed stands with different thinning regimes

Freiburg im Breisgau

2004

S. 157-164

5 Abb., 2 Tab., 15 Lit. Ang.

Artikel aus einem BuchUnselbständiges Werk

200114652

The presented paper analyses an experiment with thinning of beech (Fagus silvatica L.) and spruce (Picea abies (L.) Karst.) mixed stands in the Southern part of Czechia. The objective of the experiment is to find out the effect of different thinning regimes on structure, growth and development of mixed stands with dominance of beech and spruce. The thinning experiment is based on classical comparative method, i.e. on comparing the stands with different thinning regimes (regime without thinning - plot 1, regime with positive selection from above - plot 2 and regime with negative selection from below - plot 3). Presented study evaluates growth and development of experimental mixed stands four years after first different thinning. According to number of trees: on control plot 1 and on plot 2 (after thinning) beech portion has been increasing and spruce portion decreasing continually and on plot 3 after thinning, beech and spruce portions are nearly balanced. According to basal area: on control plot 1 and on plot 3 (after thinning) beech portion has been increasing and spruce portion decreasing continually and on plot 2 (after thinning) beech portion has been increasing and spruce portion decreasing continually and on plot 3 after thinning, beech and spruce portions are nearly balanced. According to basal area: on control plot 1 and on plot 3 (after thinning) beech portion has been increasing and spruce portion decreasing continually and on plot 2 (after thinning) ratio is practically unchanged. In connection with effect of thinning on stand microclimate, amount of dry biomass and nutrient content of biomass from holorganic horizons (L, F and H) has been investigated since 2003. The preliminary showed, that about 128 thousand kg of dry biomass per hectare is collected in holorganic horizons (L - 5,5 thousand kg.ha -1, F - 18 thousand kg.ha-1, H - 104 thousand kg.ha-1) under investigated 25 years old spruce and beech mixed. stand.