DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 9-10/1972 str. 21 <-- 21 --> PDF |
Summary Some characteristics of the Cor kova Uvala Virgin Forest The author presents a stand structure on a sample plot sized one hectare, which was chosen in the representative wart of the Čorkova Uvala Virgin Forest (Plitvice lakes National Park). The structure is given for two measurements. The first measurement was carried out in 1957, the second in 1970 (see Table). On the basis of the structure and its changes within the period of two measurements, it was concluded that the part of the virgin forest finds itself in the optimal phase of its development, displaying a selection stand structure. The selection structure in the optimal phase of the virgin forest is a consequence of the special soil conditions prevailing in the karst area, where the forest of Beech and Fir (Fagetum croaticum abietetosum Horvat) grows, which builds up the Čorkova Uvala Virgin Forest. The soil in the virgin forest is very heterogeneous with respect to depth. Its depth changes over small areas. In the horizontally layered parent rock and in stone blocks the soil is shallow, while in the sinkholes and limestone cracks the soil is deep. On deep soil Fir, Beech and Spruce achieve great height and diameter increments, while in neighbouring shallow soils they struggle throughout their whole life for existence, because of scarcity of water and nutrients in the soil (small soil volume) and because of being shaded by the neighbouring stems growing under more favourable edaphic conditions. Stems of Fir, Beech and Spruce growing on microlocalities with shallow soils attain insignificant sizes until the end of their lives. In microlocalities with shallow soils there will always be developed stems of small heights and diameters, while on deep soils they achieve always large sizes. Under such conditions the optimal phase of the virgin forest possesses a selection structure. Fir/Beech forest sites are not heterogeneous along their whole area with respect to the soil depth. In areas with a more uniform topography the soil is uniformly deep. In such localities the optimal phase of the virgin forest does not possess a selection structure. |