This thesis discusses the growth characteristics and structure of spruce forests on sites Sphagno-Piceetum. Research was carried out on the plots of 30x30 meters (Jelovica) and transects of 20 meters width (Pokljuka). On the marsh Petinove jame 12 spruce trees were cut down, while on the marsh Jelovica Za blatom 10 spruce trees and one silver fir tree were felled in orderto analyse their height growth. Height growth shows fairly persistent course, but is strongly dependent on microsite, where each tree grows. The trees that grows on pure marshy ground have more heterogeneous growth than those growing on the edge of the bog. The majority of trees is in the 2. and 3. diameter class. The average tree height is 9.3 m. Dendrochronological analysis shows that the actual ring widths largely correlates with the annual average temperature and average temperature of the growing season. The dominant trees are more likely to respond to external factors then the suppressed ones. Even older trees are usually of lower diameters. Trees of similar dimensions may differ in age substantially. Marshes are important froman ecological, habitat and phytosociological perspective and therefore should be seen as the natural heritage of our forests.
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