Analysis of wind damages in spruce and pine stands
The aim of the study was to analyse a particular cases of local damages from wind that had place in the State Forests Holding during the last 5 years in Damnica, Kolbudy, Kartuzy and Nidzica Forest Districts. Additionally, evaluation of possible limitation of those damages through silvicultural measures was carried out.
The spatial analysis made in Ripley K(t) method (in L (t) modification) shows that in spruce and pine stands, in middle and old age classes, random model of distribution prevails. It shows tendency to change into cluster pattern, as a result of damages.
The analysis of biometric features indicates a great significance in shaping of wind resistance such features as slenderness and relative crown length. The study proved importance of forest edge structure, built from strongly tappered trees growing at the edge of the stand. However, those trees shall not be branched too low.
The importance of group resistance increases in stands older than the III age class. The study results show that in stands older age classes, a light thinnings shall be applied. Maintenance of spatial order is of a great importance too, due to its limiting functions regarding wind entrance inside the forest.
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