Journal of Forest Science, 2005 (vol. 51), issue 4
Forest decline and pedobiological characteristics of humus forms in the Šumava National Park
M. Svoboda, V.V. Podrázský
J. For. Sci., 2005, 51(4):141-146 | DOI: 10.17221/4552-JFS 
Humus forms dynamics and characteristics of different forest sites were studied in the area of Smrčina Mt. in the Šumava National Park territory. The study was performed in vital Norway spruce forest, dead Norway spruce forest (bark beetle Ips typographus infestation) and on a clear-cut area (site conditions were comparable for all three plots). The amount of surface organic matter was not affected by forest decline or by clear-cut (95.5 t/ha, 73.1 t/ha and 100.2 t/ha, respectively), pH being comparable (between 2.3 and 3.2 pH KCl). A slight favourable effect of grass litter on pH increase was obvious; higher leaching of bases occurred in...
Biomass functions applicable to European beech
E. Cienciala, M. Černý, J. Apltauer, Z. Exnerová
J. For. Sci., 2005, 51(4):147-154 | DOI: 10.17221/4553-JFS
This material describes parameterization of allometric functions applicable to biomass estimation of European beech trees. It is based on field data from destructive measurements of 20 full-grown trees with diameter at breast height (dbh) from 5.7 to 62.1 cm. The parameterization was performed for total tree aboveground biomass (AB; besides stump), stem and branch biomass, respectively. The allometric functions contained two or three parameters and used dbh either as a single independent variable or in combination with tree height (H). These functions explained 97 to 99% of the variability in the measured AB. The most successful...
Distribution and attack behaviour of the red turpentine beetle, Dendroctonus valens, recently introduced to China
B. Gao, X. Wen, H. Guan, M. Knížek, J. Žďárek
J. For. Sci., 2005, 51(4):155-160 | DOI: 10.17221/4554-JFS
The red turpentine beetle, Dendroctonus valens LeConte (Coleoptera: Scolytidae), was found for the first time in China in Yangcheng and Xinshui counties, Shanxi province in 1998, and in Hebei province in 1999. The beetle mostly attacks the oil pine Pinus tabulaeformis Carriére. By 2003 the beetle was found in 85 counties of three provinces in north China and the area of infested pine forests covered more than 700,000 ha. The elevation above sea level of forests infested is more than 800 m. The beetles most frequently attack trees on hilltops and at the forest edge, fewer attacks occur in the centre of the stand. This correlates with...
Selection of clones of Populus nigra L. ssp. nigra for resistance to Melampsora larici-populina Kleb. Rust
V. Benetka, I. Šálková, F. Vrátný
J. For. Sci., 2005, 51(4):161-167 | DOI: 10.17221/4555-JFS
A possibility of selection of clones of the species Populus nigra L. with higher resistance to the rust Melampsora larici-populina Kleb. was tested in a set of 29 clones of P. nigra originating from individuals selected in various localities of the CR. Clones were tested in three localities for four years. Rust infection was evaluated according to a five-point scale. The two most resistant (R1; R2) and two most sensitive (S1; S2) clones were tested in laboratory conditions. The results of this test confirmed to be consistent with those obtained under field conditions. Significant...
Morphological and physiological parameters of beech leaves (Fagus sylvatica L.) in research demonstration object Poľana
D. Hladká, I. Čaňová
J. For. Sci., 2005, 51(4):168-176 | DOI: 10.17221/4556-JFS
Observations of the beech assimilatory apparatus in different levels of a model tree were realised from 1993 to 1999 in a research demonstration plot situated in Poľana. Different observations of the natural ecosystem condition were carried out. A model beech tree was chosen and marked as No. 228 for the above-mentioned analyses. The different ecophysiological and morphological characteristics of beech leaves were analysed in three (or two) tree crown levels. The results confirmed significant differences in these characteristics in dependence on three crown levels of mature beech tree. The differences in the mentioned characteristics were also shown...
A contribution to creating groups of trees for forest valuation
M. Michalčík
J. For. Sci., 2005, 51(4):177-185 | DOI: 10.17221/4557-JFS
During the construction of model logging costs for valuation of forest stands, by accident I found out differences between some species included in the groups of tree species. Differences within the groups of species may cause errors in logging costs of some species, for example with hornbeam, all species of linden, all species of rowans and horse chestnut. With the help of simple calculations it was proved that the differences could be very large, that they were more than forty per cent, it means they were significant. On the basis of my further research it is envisaged to increase the number of groups of trees from 13 to 16. The purpose is to give...