tailieunhanh - Báo cáo lâm nghiệp: " Changes of the mixed mountain virgin forest after 70 years on a permanent plot in the Ukrainian Carpathians"

Tham khảo luận văn - đề án 'báo cáo lâm nghiệp: " changes of the mixed mountain virgin forest after 70 years on a permanent plot in the ukrainian carpathians"', luận văn - báo cáo phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | JOURNAL OF FOREST SCIENCE 55 2009 12 567-577 Changes of the mixed mountain virgin forest after 70 years on a permanent plot in the Ukrainian Carpathians J. Veska J. Sebesta T. Kolar Department of Forest Botany Dendrology and Geobiocenology Faculty of Forestry and Wood Technology Mendel University of Agriculture and Forestry in Brno Brno Czech Republic ABSTRACT During 2004-2006 another permanent research plot No. 12 on Pop Ivan Marmarosh Mt. in the Za-karpattya province of Ukraine was renewed . re-measured and re-analyzed. The plot was originally established in the 30 s of the 20th century. The tree layer is dominated by European beech Fagus sylvatica L. with Silver fir Abies alba Mill. and Norway spruce Picea abies L. Karst. as often associated species and with sycamore maple Acer pseudoplatanus L. growing occasionally in small groups. After 70 years the tree species composition partly changed. Total live timber volume increased from to m3 ha. Considerable growth was recorded in beech while the live timber volume of fir spruce and sycamore maple did not almost change. Total number of trees 3 cm in dbh increased from 737 trees ha to 760 trees ha. Number of beech trees increased markedly. On the contrary fir and spruce showed a significant decrease in tree number. Interesting results emerged from the renewal of the permanent square plot 20 X 20 m proving that beech is able to persist in the shade for more than 70 years with only minimal increment of both height and diameter. Keywords permanent plot virgin forest stand dynamics Ukraine In the 30 s of the 20th century the young scientist Alois Zlatnik and his team Zlatnik et al. 1938 established a network of permanent research plots in the present Zakarpattya province of Ukraine Hrubý Veska 2003 . His research was aimed at the comprehension of complex relations between abiotic conditions and virgin forest types changing in space and time. Today more than 70 years have elapsed since the establishment of .