tailieunhanh - Báo cáo lâm nghiệp: " Dynamics of tree species composition and characteristics of available space utilization in the natural forest of the National Nature Reserve Hrončokovský Grúň"

Tham khảo luận văn - đề án 'báo cáo lâm nghiệp: " dynamics of tree species composition and characteristics of available space utilization in the natural forest of the national nature reserve hrončokovský grúň"', luận văn - báo cáo phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | JOURNAL OF FOREST SCIENCE 54 2008 11 497-508 Dynamics of tree species composition and characteristics of available space utilization in the natural forest of the National Nature Reserve Hroncokovský Grún M. Saniga M. Balanda Faculty of Forestry Technical University in Zvolen Zvolen Slovakia ABSTRACT The paper deals with changes in the diameter structure of particular tree species as well as with the selected production characteristics in the mixed virgin forest Hroncokovský Grún. The object of the analysis was the diameter structure of particular tree species in developmental stages of virgin forest. The data were collected in the years 1972 1982 1992 and 2002 on permanent research plots X 70 m ha in size. Diameter frequencies for particular tree species were approximated with the curves. The goal was to evaluate their mortality or vitality according to the strength of the correlation in developmental stages of the virgin forest. A strong correlation was confirmed in the advanced phase of the growth stage whereas the strongest correlation was recorded for the ash. Beech as a virgin forest bearer had a medium strong correlation. For the advanced phase of the optimum stage lower values of the correlation coefficients were determined for all tree species. The growth vitality and thus lower mortality was characteristic of maple and ash. Beech as a structure bearer is characterized by higher mortality and therefore a weaker correlation. In the breakdown stage the highest mortality was found for the fir which is confirmed by the lowest value of the correlation coefficient. In the advanced phase of the optimum stage the highest mortality was recorded for the beech. The analysis of growth and production relationships was conducted on the transects of 3 permanent research plots 10 X m in size . total size of 2 145 m2 . The analysis of the growth relationships between the crown and stem volume confirmed a strong correlation for beech and fir despite the fact

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