Journal of Forest Science, 2010 (vol. 56), issue 6
Long-term effects of CO2 enrichment on bud phenology and shoot growth patterns of Norway spruce juvenile trees
R. Pokorný, I. Tomášková, I. Drápelová, J. Kulhavý, M. V. Marek
J. For. Sci., 2010, 56(6):251-259 | DOI: 10.17221/72/2009-JFS 
Bud phenology and shoot elongation growth were monitored on Norway spruce (Picea abies [L.] Karst.) trees grown inside glass domes with adjustable windows for six years under ambient (355 µmol CO2∙mol-1) and elevated (700 µmol CO2∙mol-1) atmospheric CO2 concentrations CO2. Each treatment consisted of two stand densities - sparse (5,000 trees∙ha-1) and dense (10,000 trees∙ha-1). The age of spruce trees was 10 years at the beginning of the experiment.Elevated CO2 slightly accelerated the consequential bud...
The role of Hylastes cunicularius Erichson (Coleoptera: Scolytidae) in transferring uropodine mites in a mountain spruce forest
B. Kršiak, P. Zach, J. Kulfan
J. For. Sci., 2010, 56(6):258-264 | DOI: 10.17221/81/2009-JFS
The bark beetle Hylastes cunicularius was studied in the Tatra Mountains, West Carpathians, to clarify its role in transferring phoretic uropodine mites during dispersal in a mountain spruce forest. Emphasis was placed on the proportion of beetles vectoring deutonymphs of uropodine mites, and on assemblage structure, frequency distribution and placement of uropodids on the bark beetle vector. A total of 3,302 adults of H. cunicularius were caught into flight interception traps, of which 529 (16%) vectored a total of 1,020 individuals and four species of uropodine mites: Trichouropoda pecinai Hirschmann & Wisniewski, Trichouropoda obscura (C.L.Koch),...
Rodent-caused damage to forest trees from the viewpoint of forestry practice
J. Kamler, K. Turek, M. Homolka, E. Bukor
J. For. Sci., 2010, 56(6):265-270 | DOI: 10.17221/70/2009-JFS
Small mammals cause serious damage to forests but there is only little knowledge of their ecology and possibilities of plantation protection. The objective of our study was to collect information on the damage caused by rodents to plantations of forest tree species. Data were obtained from a survey conducted in 2008 that was aimed at damage caused by small mammals. Questionnaires were sent mostly to foresters engaged in the Lesy CR state enterprise. We obtained usable data from 316 foresters. The response rate was 81%. It was confirmed that rodents cause significant damage all over the Czech Republic and that the occurrence of damage cannot be easily...
Research on individual parameters for cutting power of woodcutting process by circular saws
J. Kováč, M. Mikleš
J. For. Sci., 2010, 56(6):271-277 | DOI: 10.17221/94/2009-JFS
Nowadays, the wood cutting process looks like a technological scheme consisting of several connected and relatively inseparable parts. Wood crosscutting is the most widespread operation in the process of forest exploitation; it is used at tree exploitation, shortening stems and assortment production. The article deals with the influence of the cutting edge geometry of circular saws on the torque and also on the cutting performance at wood crosscutting, therefore there is an influence on the whole cutting process. In the present article measurement procedure, used measuring devices and the process of result analysis are described in detailed. Knowledge...
Ground based operation effects on soil disturbance by steel tracked skidder in a steep slope of forest
B. Agherkakli, A.Najafi, S.H.Sadeghi
J. For. Sci., 2010, 56(6):278-284 | DOI: 10.17221/93/2009-JFS
In this study, the effects of slope and traffic intensity on soil compaction, rutting and forest floor removal was evaluated on a skid trail in the natural forest of north of Iran. Combination of two levels of slope < 20% (SC1) and > 20% (SC2) and three levels of traffic (one, five and nine traffics) were studied. Treatment plots, with three replications, were established on the skid trail prior to skidding. The results of this study showed that all bulk densities were considerably higher in SC2 than in SC1 and average soil bulk densities were measured from 1.07 (g∙cm-3) to 1.23 (g∙cm-3) on skid trail and 0.91...
Differences in the structure, species composition and diversity of primary and harvested forests on Changbai Mountain, Northeast China
DONGKAI SU, DAPAO YU, LI ZHOU, XIAOKUI XIE, ZHENGGANG LIU, LIMIN DAI
J. For. Sci., 2010, 56(6):285-293 | DOI: 10.17221/84/2009-JFS
Broadleaved-Korean pine (Pinus koraiensis) mixed forest is a typical vegetation type in the eastern Eurasian continent. We compared the structure, composition and diversity of a primary forest and a logged forest for effective management and regeneration of a mixed forest ecosystem on Changbai Mountain, Northeast China. The logged forest was subjected to selective harvesting twenty years ago. The mean diameter and basal area for overall trees (≥ 2 cm dbh) were higher in the primary forest than in the logged forest, whereas overall tree density was significantly lower in the former (994 ± 34 trees∙ha-1) than in the...