Journal of Forest Science, 2011 (vol. 57), issue 3
Environmental risk assessment based on semi-quantitative analysis of forest management data
L. Kulla, R. Marušák
J. For. Sci., 2011, 57(3):89-95 | DOI: 10.17221/35/2010-JFS 
The paper deals with environmental risk assessment in prevailingly unnatural spruce (Picea abies [L.] Karst.) forests in three regions with different patterns of forest damage in the Slovak part of the West Carpathians. Logistic regression was used to estimate the effect of 7 site-related, 5 stand-related and 2 anthropogenic factors on the probability that critical forest damage will occur. The results show that regression models can describe cause-effect relationships in regions with different regimes of forest decline. Stand age, proportion of spruce, and distance from the focus of biotic agent activity predicted decline in two regions with...
Forest floor and soils in limed stands of substitute species in Klášterec nad Ohří forest district in the Krušné hory Mts.
L. Menšík, E. Kula
J. For. Sci., 2011, 57(3):96-106 | DOI: 10.17221/22/2010-JFS
Forest ecosystems of the Krušné hory Mts. affected by long-term air pollution were finally disintegrated. The tree species composition has been changed in ecosystems disturbed in this way. Liming applied for the long-term revitalization of air-polluted areas partly decreased the effects of acid depositions on soil in spite of the reduction of air pollution; however, it did not cause any expected necessary changes yet. The aim of the paper is to evaluate the chemical composition of humus horizon H and organomineral horizon Ah (soil reaction, sorption complex, C/N ratio, available nutrients) in stands of substitute tree species differently affected by...
Comparison of the growth pattern of black walnut (Juglans nigra L.) in two riparian forests in the region of South Moravia, Czech Republic
L. Šálek, P. Hejcmanová
J. For. Sci., 2011, 57(3):107-113 | DOI: 10.17221/61/2010-JFS
The black walnut (Juglans nigra L.), an introduced species into the Czech Republic, is planted for its production of valuable timber. A systematic study of the black walnut growth rate at different localities and consequently the creation of standard volume tables under Central European conditions therefore appear to be of high relevance. The aim of our study was to reveal the black walnut growth pattern in its pure stands in two riparian forests along the Morava and Svratka River (Strážnice locality and Židlochovice locality, respectively). To describe and to compare relationships among diameter at breast height (dbh), tree height and age,...
Results of Czech-American cooperation in interspecific fir hybridization in 2008 and 2009
J. Stejskal, J. Kobliha, J. Frampton
J. For. Sci., 2011, 57(3):114-122 | DOI: 10.17221/80/2010-JFS
This Czech-American research collaboration is investigating interspecific hybridization among various fir species produced via control pollination. Its aim is the development of newly bred material for specific needs of Christmas tree production. The specific target of the breeding is increased growth rate, development of resistance to diseases, insect pests, and limiting environmental conditions (e.g. drought). Experimentation follows a traditional hybridization program of the Czech department focusing on the genus Abies and a long-term breeding program of the American department aimed at Christmas tree production. For hybridization, mainly...
Density of juvenile and mature wood of selected coniferous species
V. Gryc, H. Vavrčík, K. Horn
J. For. Sci., 2011, 57(3):123-130 | DOI: 10.17221/18/2010-JFS
The objective of research was to determine the density of juvenile (JW) and mature wood (MW) of selected coniferous species growing in the Czech Republic. The research included the wood of Norway spruce (Picea abies (L.) Karst.), Scots pine (Pinus sylvestris L.) and European larch (Larix decidua Mill.). The juvenile wood density close to the pith was 410 kg.m-3 for spruce, 391 kg.m-3 for pine and 573 kg.m-3 for larch with 12% water content. Mature wood in the peripheral parts had the higher density in all species - spruce 516 kg.m-3, pine 552 kg.m-3 and larch 652 kg.m-3....