In thesis we have researched the development of succession after an avalanche in 14th century and the disturbances that came after on Peči ridge. The main indicator of succession was Pinus sylvestris. We have performed a phytocenological analysis on 26 sample plots. On 20 of these also counted young trees. We analyzed the data with the UPGMA and Bray-Curtis method and got 5 non-homogenous groups. The upper part of the ridge indicates a thermophilic forest site and the lower part a beech forest site. We suppose, that the lower part of the ridge is located in the succession stage with Picea abies, Pinus sylvestris, Carex alba and is passing to stage with beech flora.
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