Journal of Forest Science, 2002 (vol. 48), issue 12
Relation of dead wood course within the development cycle of selected virgin forests in SlovakiaOriginal Paper
M. Saniga, J.P. Schütz
J. For. Sci., 2002, 48(12):513-528 | DOI: 10.17221/11920-JFS 
Following measurements of dead wood (20 to 40 years) at various developmental stages of the life cycle of selected virgin forests of the 1st to 7th altitudinal zone the relation of its course was derived. The dynamics and course of dead wood in the life cycle of virgin forests were best represented by a polynomial of the third degree. An analysis confirmed that virgin forests consisting of stable tree species with approximately the same physical age (Boky) showed small differences between maximal increase and decrease in necromass during the whole...
In vitro propagation of mature trees of Sorbus aucuparia L. and field performance of micropropagated treesOriginal Paper
V. Chalupa
J. For. Sci., 2002, 48(12):529-535 | DOI: 10.17221/11923-JFS
The influence of tree age, explant source and genotype on micropropagation of mature trees of Sorbus aucuparia has been investigated. Experiments demonstrated the feasibility to use juvenile parts of mature trees for in vitro propagation of selected genotypes. Explants from lower branches and from epicormic shoots of mature trees exhibited high multiplication coefficients of microshoots cultured on modified MS agar nutrient medium supplemented with cytokinin (BA, TDZ) and auxin (IBA). Microshoots produced from juvenile parts of mature trees exhibited good rooting response and produced plants were well adapted to grow in forest soils....
Dendroecological study of spruce growth in regions under long-term air pollution loadOriginal Paper
M. Kroupová
J. For. Sci., 2002, 48(12):536-548 | DOI: 10.17221/11921-JFS
The purpose of this study was to analyse increment cores from spruce growing in the Ore Mountains, Jizerské Mountains, and Giant Mountains, to evaluate the relationship between tree growth, climatic factors, and air pollution load. The sites from which sample cores were extracted were localised along an altitudinal gradient. Analytical methods included single pointer year analysis and simple linear regression. An unambiguous relationship between negative pointer years and climatic extremes was detected for growth increments prior to 1977. After 1977, minimum increment values also reflected the gradient of air pollution levels. In the eastern part of...
Root biomass of beech as a factor influencing the wind tree stabilityOriginal Paper
J. Kodrík, M. Kodrík
J. For. Sci., 2002, 48(12):549-564 | DOI: 10.17221/11922-JFS
Beech is, thanks to its root system, in general considered to be a wind-resistant woody plant species. Nevertheless, the research on beech root systems has revealed that it is not possible to mechanically divide the woody plants into deep rooted and shallow rooted, because their root systems are modified according to various stand conditions. The root system shape, growth and development are mostly influenced by soil conditions and groundwater level. In the case of a high groundwater level beech root systems do not form tap roots and the lateral roots are rather thin and weak. Important factor for the tree static stability is number of roots with diameter...