tailieunhanh - Báo cáo lâm nghiệp: "A change in structural diversity and regeneration processes of the spruce virgin forest in Nefcerka NNR (TANAP) in relation to altitude"

Tham khảo luận văn - đề án 'báo cáo lâm nghiệp: "a change in structural diversity and regeneration processes of the spruce virgin forest in nefcerka nnr (tanap) in relation to altitude"', luận văn - báo cáo phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | JOURNAL OF FOREST SCIENCE 54 2008 12 545-553 A change in structural diversity and regeneration processes of the spruce virgin forest in Nefcerka NNR TANAP in relation to altitude J. PlTTNER M. SANIGA Faculty of Forestry Technical University in Zvolen Zvolen Slovakia ABSTRACT This report assesses the structural diversity of the spruce virgin forest in Nefcerka NNR in the Tatra National Park TANAP . The structure of the virgin forest is evaluated by the indices proposed by Clark Evans Fuldner and Jaehne Dohrenbusch. Concerning the spatial distribution of trees Clark Evans index a statistically significant difference was confirmed between the growth stage and the optimum and the breakdown stages. The influence of altitude on the tendency of concentration of virgin forest trees was also confirmed. In the case of complex diversity evaluation by the Jaehne Do-HRENBUSCH index 1997 a statistically significantly different diversity of the spruce virgin forest between the growth stage and the other stages was found. The analysis of the regeneration processes revealed their good dynamics even at an altitude above 1 400 m and with the ascending altitude above 1 300 m the dead wood and knolls of wind-thrown roots have the greater importance as seedbeds. Keywords spruce virgin forest structural diversity regeneration processes The majority of stands in the 7th forest vegetation level should fulfil difficult ecological functions the soil protection and hydrological ones in particular. A significant part of spruce stands in this forest vegetation level preserves the character of the natural forest. Long-term monitoring of natural forests of this forest vegetation level has revealed so far remarkable differences in the process of developmental stages in the dynamics of forming the stand structure depending on altitude Korpee 1989 1995 . The author found out that the permanently open crown canopy of the spruce virgin forest is typical of altitudes above 1 400 m NNR Chopok .

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