Journal of Forest Science, 2002 (vol. 48), issue 2
The elasto-mechanical behaviour of Douglas fir, its sensitivity to tree-specific properties, wind and snow loads, and implications for stability - a simulation studyOriginal Paper
D. Gaffrey, O. Kniemeyer
J. For. Sci., 2002, 48(2):49-69 | DOI: 10.17221/11856-JFS 
A full 3-D model was developed to simulate the elasto-mechanical behaviour of trees subjected to wind and gravitational forces with the aim of estimating the stress and strain distribution at the surface of the stem. The model was adapted to geometry and material properties of a 64-year old Douglas fir tree. The results are comparable, on the whole, with those of a finite element model of this tree. Original stem and crown data, as well as the applied forces, were modified manifold in order to study their importance on the change in fibre stress and thus, on the safety reserve against stem breakage.
The decomposition of wood mass under conditions of climax spruce stands and related mycoflora in the Krkonoše MountainsOriginal Paper
L. Janovský, A. Vágner, J. Apltauer
J. For. Sci., 2002, 48(2):70-79 | DOI: 10.17221/11857-JFS
The mycoflora was investigated under the conditions of climax spruce stands in the Krkonoše Mountains in relation to wood decomposition. The areas under observation have been affected more or less by air pollution since the eighties. The average mass of deadwood found on the plots is 124 m3 per ha - the mass of fallen trunks is about 32 m3 per ha, mean value from total average. About 128 species of macrofungi were identified that besides others included 43 species of wood-decaying fungi. Also 54 mycorrhizal species were identified. Among the mycorrhizal fungi about 10 species were dominant, such as Laccaria laccata (Scop.: Fr.)...
Reduction of timber value from damaged spruce stands after their diebackOriginal Paper
R. Petráš
J. For. Sci., 2002, 48(2):80-87 | DOI: 10.17221/11858-JFS
The paper presents a method for the derivation of total timber production and of increments in value units, particularly in net financial yield for spruce stands damaged by crown defoliation after their dieback. The value production was derived by means of value growth models of undamaged stands and models for the adjustment of volume and qualitative production of damaged and died stands. Changes in timber quality after tree drying and changes in the production of damaged stands compared with undamaged ones are illustrated in tables and graphs. The changes are expressed by means of the indexes of total mean increment and total current increment. They...
South-Moravian floodplain forest herb vegetation in the period 1978-1997Original Paper
J. Viewegh
J. For. Sci., 2002, 48(2):88-92 | DOI: 10.17221/11859-JFS
The results document changes in the herb vegetation of a South-Moravian floodplain forest in the period of 1978-1997. It is shown that hydrological measures strongly changed the floodplain forest in the area of the Dyje river near Lednice na Moravě. The herb vegetation in the area of the confluence of the Morava and the Dyje rivers was conserved nearly unchanged after artificial floods.