Template-Type: ReDIF-Article 1.0 Author-Name: R. Petráš Author-Workplace-Name: National Forest Centre - Forest Research Institute Zvolen, Zvolen, Slovakia Author-Name: J. Mecko Author-Workplace-Name: National Forest Centre - Forest Research Institute Zvolen, Zvolen, Slovakia Author-Name: V. Nociar Author-Workplace-Name: National Forest Centre - Forest Research Institute Zvolen, Zvolen, Slovakia Title: Value production of poplar clones Abstract: The results of research on the value production of the stands of poplar clones Robusta and I-214 carried out in Slovakia are presented. Models of value yield tables were constructed separately for each clone. The models simulate gross and net financial yield of wood production in dependence on the site index and age of stand. They were constructed on the basis of the models of assortment yield tables, timber prices according to assortments and the models of own costs of timber felling and processing. The clone I-214 produces a faster and higher proportion of thicker assortments of average and below-average quality, and therefore it has the higher value production at a younger age only. Robusta produces smaller diameter but higher quality assortments and has the higher value production only at an older age. The site index of the stand is the most important factor in the value production of poplar clones. Differences in the production between site indexes are much greater than between the clones. Keywords: poplar clones, value production, gross and net financial yield, value yield tables Journal: Journal of Forest Science Pages: 237-244 Volume: 54 Issue: 6 Year: 2008 DOI: 10.17221/12/2008-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/12/2008-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200806-0001.txt Handle: RePEc:caa:jnljfs:v:54:y:2008:i:6:id:12-2008-JFS Template-Type: ReDIF-Article 1.0 Author-Name: O. Mauer Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry in Brno, Brno, Czech Republic Author-Name: R. Bagár Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry in Brno, Brno, Czech Republic Author-Name: E. Palátová Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry in Brno, Brno, Czech Republic Title: Response of the Norway spruce (Picea abies [L.] Karst.) root system to changing humidity and temperature conditions of the site Abstract: The Bohemian-Moravian Upland shows a large-scale decline and dieback of Norway spruce up to the forest altitudinal vegetation zone (FAVZ) 5. This phenomenon has been observed in the last 7 years and its progress is rapid. Healthy, declining and standing dry trees of equal height were mutually compared in nine forest stands (aged 3-73 years). These parameters were measured: increment dynamics, root system architecture, biomass, fine root vitality and mycorrhiza, infestation by biotic and abiotic agents. Analyses were done for 414 trees, soil characteristics and weather course data covered the period 1961-2004. Warming and precipitation deficit are the predisposition factors. Weakened trees are aggressively infested by the honey fungus (Armillaria mellea), and they die from root rots. In this paper we describe the mechanism of damage to and dieback of the spruce trees concerned. Keywords: Norway spruce, decline, climate change, root system, rots Journal: Journal of Forest Science Pages: 245-254 Volume: 54 Issue: 6 Year: 2008 DOI: 10.17221/14/2008-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/14/2008-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200806-0002.txt Handle: RePEc:caa:jnljfs:v:54:y:2008:i:6:id:14-2008-JFS Template-Type: ReDIF-Article 1.0 Author-Name: L. Píšová Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: M. Svoboda Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: J. Šantrůček Author-Workplace-Name: Faculty of Science, University of South Bohemia in České Budějovice, České Budějovice, Czech Republic Author-Name: H. Šantrůčková Author-Workplace-Name: Faculty of Science, University of South Bohemia in České Budějovice, České Budějovice, Czech Republic Title: Can 13C stable isotope record of Norway spruce tree rings display the effect of environmental conditions? Abstract: The Bohemian Forest Mts. (Šumava) were exposed to heavy atmospheric pollution in the last century. A possible negative effect of atmospheric pollution on tree physiology has been studied using the isotopic composition, Δ13C, of tree rings. The wood is depleted of 13C relative to the air due to isotopic discrimination against 13C and preferred uptake of 12C during photosynthesis. The ratio 13C/12C (Δ13C) reflects the relative magnitudes of net assimilation and stomatal conductance that relate to demand and supply of CO2. Carbon-13 data are thus a useful index for assessing intrinsic water use efficiency (mark period of drought or root system damages) and also could indicate assimilation organ injure (needle damage caused due to acid rain etc.). A decrease in Δ13C implies a negative effect of environmental conditions on tree physiology. Presumably, changes in soil pH and aluminium content as an indirect effect of atmospheric pollution could have an impact on tree physiology. Our results showed that the isotopic signal varied around the average, but the Δ13C signal was decreasing from the 1950s to 1980s and then increasing again starting in the 1990s. This trend is in accordance with the monitored atmospheric pollution and soil solution pH changes. Keywords: Δ 13C, air pollution, tree physiology, Bohemian Forest Mts., soil pH, aluminium, soil acidification Journal: Journal of Forest Science Pages: 255-261 Volume: 54 Issue: 6 Year: 2008 DOI: 10.17221/816-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/816-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200806-0003.txt Handle: RePEc:caa:jnljfs:v:54:y:2008:i:6:id:816-JFS Template-Type: ReDIF-Article 1.0 Author-Name: J. Beránek Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry in Brno, Brno, Czech Republic Title: The response of weevil communities (Coleoptera: Curculionoidea) to the altitudinal zones of beech stands Abstract: Good knowledge of geobiocoenoses is one of the primary preconditions for biogeographical differentiation of the landscape, protected territory tending and preservation of forest ecosystems. For deepening the knowledge of the complex geobiocoenological relations the study of curculiocoenoses was conducted. It was conducted in eighteen permanent research plots based in beech stands of the 3rd, 4th and 5th altitudinal zone in the regions of South Moravia and East Bohemia. The relation of weevils to altitudinal zones was proved on the basis of some ecological index numbers and statistic methods DCA and CCA (P ≤ 0.001). It was found out that curculiocoenoses of the investigated altitudinal zones overlapped and some species decreased or increased their dominance and abundance with increasing altitude. Characteristics of the beech stand curculiocoenoses have been proposed for the 3rd, 4th and 5th altitudinal zone, which can be used as an ancillary component of the geobiocoenological or typological system. For a more complex conclusion similar research of weevils should be carried out in the beech stands of other altitudinal zones and also in other forest stands. Keywords: altitudinal zones, beech stand, geobiocoenology, weevils, Curculionoidea, zoocoenosis Journal: Journal of Forest Science Pages: 262-272 Volume: 54 Issue: 6 Year: 2008 DOI: 10.17221/25/2008-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/25/2008-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200806-0004.txt Handle: RePEc:caa:jnljfs:v:54:y:2008:i:6:id:25-2008-JFS Template-Type: ReDIF-Article 1.0 Author-Name: P. Čermák Author-Workplace-Name: Research Institute for Soil and Water Conservation, Prague, Czech Republic Title: Forest reclamation of dumpsites of coal combustion by-products (CCB) Abstract: The present paper describes the reclamation of dumpsites of coal ash - coal combustion by-products (CCB) generated by the burning of brown coal in thermal power plants. It evaluates the soil properties of formed Anthroposols and growth vitality of the forest tree species Quercus robur L., Quercus rubra L., Pinus sylvestris L., Betula verrucosa Ehrh., Populus tremula L., Populus nigra L., Salix fragilis L., Salix alba L., Alnus glutinosa (L.) Gaertn. The best growth vitality at these sites was reached in tree species of seed origin from the vegetation series of primary succession. Deformations of the taproot (taproot laterals) in trees under 10 years of age were observed on Anthroposol from coal ash in Salix alba L., Salix fragilis L., Populus tremula L., Populus nigra L. and Populus alba L. and in the overlaying of the compacted stabilizate with a layer of reclaimable soil up to 0.5 m in Pinus sylvestris L., Alnus glutinosa (L.) Gaertn. and Quercus rubra L. Keywords: forest reclamation, Anthroposol, coal-ash dumpsite, coal combustion by-products, soil properties, growth vitality, root system Journal: Journal of Forest Science Pages: 273-280 Volume: 54 Issue: 6 Year: 2008 DOI: 10.17221/6/2008-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/6/2008-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200806-0005.txt Handle: RePEc:caa:jnljfs:v:54:y:2008:i:6:id:6-2008-JFS Template-Type: ReDIF-Article 1.0 Author-Name: H. Gu Author-Workplace-Name: School of Forestry, Northeast Forestry University, Harbin, China Author-Workplace-Name: Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China Author-Name: L. Dai Author-Workplace-Name: Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China Title: Structural and compositional responses to timber harvesting for an old-growth forest on Changbai Mountain, China - Short Communication Abstract: Broadleaved-Korean pine (Pinus koraiensis) mixed forest is a dominant native vegetation type in the eastern Eurasian Continent. We intended to examine the implications of high-intensity timber harvesting (ca 70% of stand volume) for the sustainable management of a mixed forest ecosystem. We measured trees at three sites: control without cutting, older-cut site cut in 1987 and newer-cut site (cutting in 1997). There were significant differences in structure and composition between these three sites in 2003. There were 4,441 trees of 14 species with basal area 56 m2 at control plot, 6,314 trees of 16 species with basal area 9 m2 at newer-cut site and 8,438 trees of 21 species with basal area 31 m2 at older-cut site (all on the area of 1 ha). The high-intensity timber harvesting system helped promote natural regeneration and the growth of small trees but it also allowed light-demanding tree species to invade into the forest. Dominant position and suitable diameter distribution of economically important species (Pinus koraiensis and Tilia amurensis) were maintained across the three sites. The existing timber harvesting appears to consider short-term economic values to a larger extent than long-term ecological values. To manage the broadleaved-Korean pine mixed forest for both timber production and biodiversity conservation, timber-harvesting intensity must be lowered. Keywords: forest harvesting, stand structure, species composition, northeast China, forest conservation, Pinus ko-raiensis Journal: Journal of Forest Science Pages: 281-286 Volume: 54 Issue: 6 Year: 2008 DOI: 10.17221/20/2008-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/20/2008-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200806-0006.txt Handle: RePEc:caa:jnljfs:v:54:y:2008:i:6:id:20-2008-JFS