Structure, production, and regeneration processes of a Norway spruce natural forest in the National Nature Reserve Zadna Polana
1999
Filova, I. (Technicka Univ., Zvolen (Slovak Republic). Lesnicka Fakulta)
In 1974, permanent experimental plots (TVP) were established in the Polana Mts. in such a way, that they cover all three stages of the development cycle of a virgin forest. On all three TVPs, Norway spruce predominates in the tree species composition, with an admixture of rowan, beech and sycamore, exceptionally silver fir. The canopy closure rate ranged within three measurements from 0.5 to 1.1. The crowns are relatively narrow and long. The number of trees with BHD more than 8 cm (thick trees) is 250 to 300 individuals per hectare, the total number of trees ranges from 250 to 360 per hectare. Broadleaves a most represented on the plot situated in the advanced phase of the regeneration stage. The growing stock ranges on individual plots within the development cycle from 300 to 700 cubic m/ha. The lowest growing stock was recorded on the plot within the advanced phase of the degeneration stage, where it decreased to approx. 45% of the maximum stock in the optimum stage. The number of individuals of the natural regeneration ranges on individual plots from 650 to 10915 per hectare. Most represented are individuals up to 20 cm of height. The conditions for their further growth are limited, due to a high abundance of large-leaved herbs. The regeneration occurs frequently on lying decaying stems. On the basis of all investigated traits, TVPs were classified as follows: TVP 1 as advanced phase of the degeneration stage with transition to the regeneration stage, TVP 2 as advanced optimum stage, TVP 3 as advanced regeneration stage with transition to the optimum stage
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