Responses of Abies alba seedlings to different site conditions in Picea abies plantations

Abstract

Introduction of silver fir (Abies alba Mill.) as one of the historically important coniferous tree spe- cies in Central Europe into allochthonous cultivated forests is an important task for contemporary and future generations of foresters. The aim of our work was to optimize the management of fir in allochthonous culti- vated stands of National Park Ceske Svýcarsko formed mainly by Norway spruce (Picea abies /L./Karst.). The effects of light and soil conditions and game on the survival and growth of fir plantations were investigated. Browsing was determined as the limiting factor for fir reintroduction. Assessing the significance of edaphic conditions for the height increment of fir, favourable effect of luvisol could be demonstrated as compared to acidic soil. Canopy openness maximum of 30% and stand basal area of 30 to 43m 2 /ha with relative direct radi- ation of up to 45% and relative indirect radiation of up to 55% with prevalence of the diffuse component cre- ate optimal environmental conditions for the survival and sustainable growth of fir plantations in the spruce stand in regeneration.