Template-Type: ReDIF-Article 1.0
Author-Name: S. Vacek
Author-Workplace-Name: 2
Author-Name: K. Matějka
Author-Workplace-Name: 2
Title: Vegetation changes in beech and spruce stands in the Orlické hory Mts. in 1951-2001
Abstract: Plant cenological surveys on the basis of Braun-Blanquet's seven-point scale were made on 34 research plots in the course of studies of vegetation changes in beech and spruce stands in the Orlické hory Mts. over period of 1951-2001. The acquired data were processed not only by traditional plant coenological methods but also by numerical analyses (agglomerative and divisive classification, ordination, species diversity). The results document marked changes that occurred in species-rich spruce communities of the association Athyrio alpestre-Piceetum (Aa-P) as well as in species-poorer communities of the associations Vaccinio myrtilli-Piceetum (Vm-P), Calamagrostio villosae-Piceetum (Cv-P) and Deschampsio flexuosae-Piceetum (Df-P). The developmental trend of these communities in 1971-1991 converged on types very poor in species (Df-P association). On the contrary, the period 1991-2001 was characterised by a marked increase in the number of species, especially in the herb layer. An increase in coverage and number of tree species seedlings was very high after the productive seed years 1992 and 1995. The acceleration of changes in beech stands in 1971-1991 led to a species number diminution in herb-rich types of the association Dentario enneaphylli-Fagetum (De-F), and/or to their transition to species-poorer acidophilous types Calamagrostio villosae-Fagetum (Cv-F). Similarly like in spruce stands the number of species in beech stand relevés increased in 1991-2001. But a majority of typical species of herb-rich beech stands returned to the communities under study very slowly.
Keywords: mountain forests, beech and spruce stands, plant cenology, classification, ordination, species diversity, air pollution
Journal: Journal of Forest Science
Pages: 445-473
Volume: 49
Issue: 10
Year: 2003
DOI: 10.17221/4718-JFS
File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4718-JFS.html
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Handle: RePEc:caa:jnljfs:v:49:y:2003:i:10:id:4718-JFS

Template-Type: ReDIF-Article 1.0
Author-Name: B. Konôpka
Author-Workplace-Name: Forest Research Institute Zvolen, Zvolen, Slovak Republic
Author-Name: J. Konôpka
Author-Workplace-Name: Forest Research Institute Zvolen, Zvolen, Slovak Republic
Title: Static stability of forest stands in the seventh altitudinal vegetation zone in Slovakia
Abstract: Models evaluating static stability (resistance to breaking or uprooting of trees caused by wind, snow or ice) of forest stands in the seventh altitudinal vegetation zone were determined. The empirical material came from 180 research plots (High Tatra and Low Tatra Mountains) established within the research project Research on methods for mountain forest management based on sustainable Development. Static stability was characterized by the slenderness ratio that was calculated from the mean height and diameter of target trees. Then the particular forest stands were categorized with regard to slenderness ratio, mean diameter and absolute site class using either tables or graphic models. Particularly, four static stability classes were made up: 1 - very good, 2 - good, 3 - sufficient, and 4 - insufficient. Practical application of the models is shown for forest stands grown in the area of Vajsková and Lomnistá valleys.
Keywords: Norway spruce, wind firmness, slenderness ratio, static stability classes
Journal: Journal of Forest Science
Pages: 474-481
Volume: 49
Issue: 10
Year: 2003
DOI: 10.17221/4719-JFS
File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4719-JFS.html
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Handle: RePEc:caa:jnljfs:v:49:y:2003:i:10:id:4719-JFS

Template-Type: ReDIF-Article 1.0
Author-Name: Š. Kohán
Author-Workplace-Name: Forestry Research Institute, Košice Research Station, Slovak Republic
Title: Evaluation of the growth and health of different poplars in the Latorica area in Východoslovenská nížina conditions
Abstract: The paper presents the results of evaluating the growth and health of 20 different poplars from the Aigeiros group in 30-year populetum Leles on uninundated alluvia of the Latorica River in ecological conditions of the lowland Východoslovenská nížina. The populetum is situated on medium-heavy loamy soils in the group of forest site types Ulmeto-Fraxinetum carpineum. The results of evaluation document that out of the investigated poplar clones the poplars I-214, I-476, Blanc du Poitou, Flachslanden and P. nigra (Baka 5) had the best height and diameter growth and maximum volume production. Their health status was also very good. The lowest volume production was determined in P. nigra (009/66 ČR), I-455 and Grandis, and the worst health was found out in Grandis, P. nigra (Pavlovce 1) and P. nigra (Ivachnova 1). These results will facilitate to include the poplars I-476 and Flachslanden in the assortment of regionalized poplars for the lowland area of Východoslovenská nížina.
Keywords: poplars, growth and production, pests, ecological conditions
Journal: Journal of Forest Science
Pages: 482-489
Volume: 49
Issue: 10
Year: 2003
DOI: 10.17221/4720-JFS
File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4720-JFS.html
File-Format: text/html
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Handle: RePEc:caa:jnljfs:v:49:y:2003:i:10:id:4720-JFS