Template-Type: ReDIF-Article 1.0
Author-Name: I. Schmid
Author-Name: K. Klumpp
Author-Name: M. Kazda
Title: Light distribution within forest edges in relation to forest regeneration
Abstract: Light conditions were measured along six transects from 35 m inside of a mixed Norway spruce/Scots pine forest to an adjoining clear-cut in NW-Austria. Photosynthetic photon flux density (PFD) was recorded every minute of the day from 5:00 a.m. to 8:00 p.m. for three weeks in July. PFD decreases exponentially from the clear-cut to the interior of the forest following the gap fraction. Low light intensity classes (< 50 µmol photons m2/s) decrease from the stand towards the open, whereas the clear-cut receives light of higher intensities (> 200 µmol photons m2/s) for most of the day. PFD values assessed during the day were compared with photosynthetic light response curves measured on advanced planting of broadleaf species in the same stand. The high light compensation point of Quercus petraea enables carbon gain in deep shade for about 60% of the day. The other shade tolerant species Fagus sylvatica and Acer pseudoplatanus can perform net photosynthesis at 80% and 90% of the time, respectively. This reduces the possibility of advanced planting of light demanding species to the first few meters of the inner part of the forest edge.
Keywords: advanced planting, forest edge, light compensation point, photon flux density
Journal: Journal of Forest Science
Pages: 1-5
Volume: 51
Issue: 1
Year: 2005
DOI: 10.17221/4538-JFS
File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4538-JFS.html
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Handle: RePEc:caa:jnljfs:v:51:y:2005:i:1:id:4538-JFS

Template-Type: ReDIF-Article 1.0
Author-Name: P. Čermák
Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry Brno, Brno, Czech Republic
Author-Name: J. Ježek
Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry Brno, Brno, Czech Republic
Title: Effect of tree seed crop on small mammal populations and communities in oak and beech forests in the Drahany Upland (Czech Republic)
Abstract: In 2002 (year with poor seed crop) and 2003 (year with good seed crop), the trapping of small mammals was carried out into standard snap-traps on transects situated in the area of the Křtiny Training Forest Enterprise, U buku locality (the Drahany Upland). The trapping was carried out in both years once a month in the period of September-November, in two types of forest of the community Querci-fageta: in a stand dominated by oak and in a stand dominated by beech. In total, 146 individuals were recorded, out of them 142 rodents - Apodemus flavicollis (81 individuals), Apodemus sylvaticus (32), Clethrionomys glareolus (29) and 4 individuals of insectivores - Sorex araneus. Apodemus flavicollis dominated in both types of stands. In the most numerous Apodemus flavicollis, body dimensions were compared between oak and beech stands; the differences were not significant. Species diversity (owing to the presence of Sorex araneus) is slightly higher in oak stands (diversity index H' = 1.60) as compared with beech stands (H' = 1.43). From the aspect of faunistic similarity, it is the case of very similar communities (Re = 97.3; IBC = 0.79). In all trapped individuals, basic body parameters were measured. In the oak forest, a higher total abundance was determined in all species as compared with the beech forest. Rodent populations responded to the poor crop of beechnuts and acorns in 2002 by a decline in numbers and to the good seed crop in 2003 by an increase in numbers (Apodemus spp.). Another response was the prolongation of reproduction period. In stomachs of the rodents caught in 2003 the percentage of starch granules of consumed food was superior to 2003.
Keywords: small mammals, oak forest, beech forest, seed crop, Apodemus spp., Clethrionomys glareolus
Journal: Journal of Forest Science
Pages: 6-14
Volume: 51
Issue: 1
Year: 2005
DOI: 10.17221/4539-JFS
File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4539-JFS.html
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Handle: RePEc:caa:jnljfs:v:51:y:2005:i:1:id:4539-JFS

Template-Type: ReDIF-Article 1.0
Author-Name: M. Slávik
Author-Workplace-Name: Faculty of Forestry and Environment, Czech University of Agriculture in Prague, Prague, Czech Republic
Title: Production of Norway spruce (Picea abies [L.] Karst.) seedlings on substrate mixes using growth stimulants
Abstract: We evaluated the growth of Norway spruce (Picea abies [L.] Karst.) seedlings on peat and bark substrates, on their mixes and on their mixes with agroperlite. We examined the basic quantitative traits (seedling diameters and heights), the number of produced seedlings per unit area, main root lengths, number of axial shoots and dry weight of shoots and roots. Besides the study of substrate influence on the biometrical characteristics of seedlings applied standard fertilisation an experiment was established as the second variant where the effect of biostimulants was tested; they were supplied by the Jaminex Company. The experiment was established with three replications by standard technologies used in forest operations. A conclusion can be drawn that in our experiments peat was found to be the most suitable substrate for production of Norway spruce seedlings. Positive effects of biostimulants were highly significant on almost all tested substrate mixes.
Keywords: Norway spruce seedlings, substrates and their mixes, biostimulant treatment
Journal: Journal of Forest Science
Pages: 15-23
Volume: 51
Issue: 1
Year: 2005
DOI: 10.17221/4540-JFS
File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4540-JFS.html
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Handle: RePEc:caa:jnljfs:v:51:y:2005:i:1:id:4540-JFS

Template-Type: ReDIF-Article 1.0
Author-Name: R. Dudík
Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry Brno, Brno, Czech Republic
Title: Economic aspects of the selection system of management at the Masaryk Forest Training Forest Enterprise Křtiny
Keywords: selection system, grading, cost model, yield model, profitability
Journal: Journal of Forest Science
Pages: 24-36
Volume: 51
Issue: 1
Year: 2005
DOI: 10.17221/4541-JFS
File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4541-JFS.html
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Handle: RePEc:caa:jnljfs:v:51:y:2005:i:1:id:4541-JFS

Template-Type: ReDIF-Article 1.0
Author-Name: J. Dobiáš
Author-Workplace-Name: Faculty of Forestry and Environment, Czech University of Agriculture in Prague, Prague, Czech Republic
Title: Forest road erosion
Abstract: The forest road network influences surface runoff of uninfiltrated precipitation water on forest lands, mainly in hilly and mountainous areas. This water flows onto the road crown in unpaved forest roads that do not have any ditches. Dragging of extracted logs causes mechanical damage to the crown of unpaved forest road, and tracks after tractor wheels and furrows after dragged logs originate. Flowing water is accumulated in these depressions and the water stream causes erosion. The method for evaluation of conditions for the origination and degree of this erosion damage consists in the calculation of tangential stresses near the bottom at various depths of water and various gradients of road. Limit gradients of road for the origination of greater or smaller damage by erosion for the subsoil grain of various sizes are determined by a comparison of calculated tangential stresses with critical tangential stresses. Rates of discharge were calculated for the particular models of damage.
Keywords: erosion on forest roads, forest roads, forest road network
Journal: Journal of Forest Science
Pages: 37-46
Volume: 51
Issue: 1
Year: 2005
DOI: 10.17221/4542-JFS
File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4542-JFS.html
File-Format: text/html
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Handle: RePEc:caa:jnljfs:v:51:y:2005:i:1:id:4542-JFS