Template-Type: ReDIF-Article 1.0 Author-Name: P. L. Peri Author-Workplace-Name: Universidad Nacional de la Patagonia Austral - Instituto Nacional de Tecnología Agropecuaria - Consejo Nacional de Investigaciones Científicas y Técnicas, Río Gallegos, Santa Cruz, Argentina Author-Name: G. Martínez Pastur Author-Workplace-Name: Centro Austral de Investigaciones Científicas, Ushuaia, Tierra del Fuego, Argentina Author-Name: M. V. Lencinas Author-Workplace-Name: Centro Austral de Investigaciones Científicas, Ushuaia, Tierra del Fuego, Argentina Title: Photosynthetic response to different light intensities and water status of two main Nothofagus species of southern Patagonian forest, Argentina Abstract: Net photosynthetic rate (A) and stomatal conductance (gs) of leaves of Nothofagus pumilio and N. an-tarctica seedlings were measured at different photosynthetic photon flux densities (PPFDs, 20, 150, 250, 500, 750, 1,000, 1,500 and 2,200 μmol/m2/s) and after 60 minutes of shade to determine the rate of photosynthetic induction after seedling transition from low to high PPFD. A and gs were also measured to evaluate the responses to water stress and the tolerance to waterlogging. N. pumilio had higher A values than N. Antarctica for all light intensities measured with the maximum value of 16.8 μmol CO2/m2/s saturated at 1,000 μmol/m2/s PPFD. Values of gs for both Nothofagus species also declined as light intensity decreased. The times required for full induction of A were 18 and 27 minutes after the increase of PPFD (full sun) for N. pumilio and N. Antarctica, respectively. There was a negative relationship between A and water stress, expressed as pre-dawn leaf water potential (ψlp), where the reduction in gs was the main factor that reduced A in both species. Tolerance to waterlogging was related with changes in A and gs where N. Antarctica was more tolerant. These photosynthetic results of Nothofagus leaves to fluctuating light, water stress and waterlogging could be used to estimate the responses of regeneration to environmental conditions under the dynamics of natural stands, after silvicultural practices and for restoration plans. Keywords: Nothofagus, shade, photosynthesis, water stress, waterlogging Journal: Journal of Forest Science Pages: 101-111 Volume: 55 Issue: 3 Year: 2009 DOI: 10.17221/66/2008-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/66/2008-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200903-0001.txt Handle: RePEc:caa:jnljfs:v:55:y:2009:i:3:id:66-2008-JFS Template-Type: ReDIF-Article 1.0 Author-Name: A. Jurásek Author-Workplace-Name: Forestry and Game Management Research Institute, Strnady, Opočno Research Station, Opočno, Czech Republic Author-Name: J. Leugner Author-Workplace-Name: Forestry and Game Management Research Institute, Strnady, Opočno Research Station, Opočno, Czech Republic Author-Name: J. Martincová Author-Workplace-Name: Forestry and Game Management Research Institute, Strnady, Opočno Research Station, Opočno, Czech Republic Title: Effect of initial height of seedlings on the growth of planting material of Norway spruce (Picea abies [L.] Karst.) in mountain conditions Abstract: Common ways of nursery cultivation and sorting the planting material of mountain provenances of Norway spruce (Picea abies [L.] Karst.) are connected with the risk of undesirable narrowing of the genetic spectrum of populations. Investigations in spruce plantations established by different planting materials found out very good growth (total height is 125 cm 9 years after outplanting) and health status of these slowly growing seedlings planted in extreme mountain conditions. In order to prevent the genetic spectrum narrowing, we recommend to cultivate all seedlings including smaller outsorted (commonly culled) ones. The smallest seedlings can be grown one year longer and subsequently planted out in the same locality as the remaining planting material of the same seed lot. Keywords: Norway spruce, mountain conditions, mountain populations, reforestation Journal: Journal of Forest Science Pages: 112-118 Volume: 55 Issue: 3 Year: 2009 DOI: 10.17221/97/2008-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/97/2008-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200903-0002.txt Handle: RePEc:caa:jnljfs:v:55:y:2009:i:3:id:97-2008-JFS Template-Type: ReDIF-Article 1.0 Author-Name: T. Fabiánek Author-Workplace-Name: Institute of Forest Ecology, Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry in Brno, Brno, Czech Republic Author-Name: L. Menšík Author-Workplace-Name: Institute of Forest Ecology, Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry in Brno, Brno, Czech Republic Author-Name: I. Tomášková Author-Workplace-Name: Laboratory of Plants Ecological Physiology of Systems Biology and Ecology, Academy of Sciences of the Czech Republic, Brno, Czech Republic Author-Name: J. Kulhavý Author-Workplace-Name: Institute of Forest Ecology, Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry in Brno, Brno, Czech Republic Title: Effects of spruce, beech and mixed commercial stand on humus conditions of forest soils Abstract: A pedological survey was carried out in a spruce monoculture, beech stand, and in a mixed stand at a field research station in Rájec-Němčice of the Institute of Forest Ecology (IFE), Mendel University of Agriculture and Forestry (MUAF) in Brno in the region of the Drahanská Upland in 2004-2006. The aim of the paper was to evaluate (i) humus reserves and forms, (ii) soil reaction, (iii) reserves of total carbon and nitrogen for the forest floor layers and (iv) carbon/nitrogen ratio. Soil analyses were carried out on samples taken at the end of the growing season in a spruce, beech and mixed stand. The highest reserves of forest floor were found in the spruce stand (71.8 t/ha), which also corresponded to the exchangeable soil reaction 3.3 ± 0.4, the C/N ratio being 27.3 ± 3.0. The lowest reserves were found in the beech stand (46.7 t/ha), the soil reaction was 3.6 ± 0.5 and the C/N ratio was 26.0 ± 5.2. The mixed stand represented an intermediate value between extreme positions. Keywords: tree species composition, soil, forest floor reserves, humus forms, pH, C/N ratio Journal: Journal of Forest Science Pages: 119-126 Volume: 55 Issue: 3 Year: 2009 DOI: 10.17221/70/2008-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/70/2008-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200903-0003.txt Handle: RePEc:caa:jnljfs:v:55:y:2009:i:3:id:70-2008-JFS Template-Type: ReDIF-Article 1.0 Author-Name: I. Machar Author-Workplace-Name: Department of Biology, Faculty of Education, Palacký University in Olomouc, Olomouc, Czech Republic Title: Changes in the fragmentation and ecological stability of the Morava River floodplain forest in the course of the 20th century Abstract: This paper presents the results of an analysis of the changes in the fragmentation and ecological stability of the floodplain forest geobiocoenoses in the Protected Landscape Area Litovelské Pomoraví, Czech Republic. Using GIS methods, it was determined that the fragmentation within the study area had increased slightly and the ecological stability of the landscape had decreased slightly between the years 1938 and 2006, although the latter remained on a fairly high level. The data reflect the anthropogenic conditionality of the floodplain forest ecosystem and show that an anthropogenically conditioned geobiocoenosis may attain a relatively high level of ecological stability, this being particularly characteristic of floodplain forest geobiocoenoses in Central Europe. The results of the study contribute to the documents that will be used in drawing up a management plan for the locality important at the European level which is a part of the Natura 2000 system. Keywords: ecological stability, floodplain forest, fragmentation Journal: Journal of Forest Science Pages: 127-136 Volume: 55 Issue: 3 Year: 2009 DOI: 10.17221/98/2008-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/98/2008-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200903-0004.txt Handle: RePEc:caa:jnljfs:v:55:y:2009:i:3:id:98-2008-JFS Template-Type: ReDIF-Article 1.0 Author-Name: P. Čermák Author-Workplace-Name: Research Institute for Soil and Water Conservation, Prague, Czech Republic Author-Name: V. Ondráček Author-Workplace-Name: North Bohemian Mines, a. s., Chomutov, Czech Republic Title: Findings from the application of coal combustion by-products (CCB) for forest reclamation on spoil banks of the North Bohemian Brown Coal Basin Abstract: Coal combustion by-products (stabilizate, FDG gypsum) generated by the thermal power station in Ledvice were tested on an above-level dump of the Bílina Mine in the North Bohemian Brown Coal Basin during the reclamation of its surface for forestry purposes. A part of the experimental object was treated with coal combustion by-products at a dose of 700-1,000 t/ha that were incorporated into the soil profile by very deep ploughing and the other part was left untreated for comparison. A one-year preparatory agrocycle was conducted on the entire experimental object - growing of Leucosinapis alba for green manuring and for reforestation bareroot and container-grown planting material was set out into dug holes [Larix deciduas L., Pinus nigra Arn., Pinus sylvestris L., Quercus robur L., Carpinus betulus L., Acer pseudoplatanus L., Acer platanoides L., Alnus glutinosa (L.) Gaertn., Fraxinus excelsior L., Tilia cordata Mill., Betula verrucosa Ehrh.]. The assessment of the experimental object at the age of 7 years indicated that as a result of the application of stabilizate and FDG gypsum there was an increase in porosity, water-retaining capacity, soil alkalinity and carbonate content; the soil-forming process was characterized by a decrease in soil alkalinity whereas the high alkalinity of the soil horizon treated with this amendment did not negatively influence the growth vitality of most tree species taxa used for reforestation. Keywords: spoil bank Anthroposols, forest reclamation, coal combustion by-products, soil properties, growth vitality, root system Journal: Journal of Forest Science Pages: 137-144 Volume: 55 Issue: 3 Year: 2009 DOI: 10.17221/91/2008-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/91/2008-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200903-0005.txt Handle: RePEc:caa:jnljfs:v:55:y:2009:i:3:id:91-2008-JFS