Journal of Forest Science, 2011 (vol. 57), issue 12
Index Volume 57
editors
J. For. Sci., 2011, 57(12):I-V | DOI: 10.17221/4434-JFS 
Structure and origin of mountain Norway spruce in the Bohemian Forest
V. Čada, M. Svoboda
J. For. Sci., 2011, 57(12):523-535 | DOI: 10.17221/31/2011-JFS
Information on the historical background of the present forest conditions is needed for proper decisions on forest management. Disturbances play a major role in the formation of forest structure and composition. This paper compares the present break-up of mountain spruce stands in the Bohemian Forest (in the Šumava Protected Landscape Area) with conditions during their initiation using dendrochronological techniques. On three selected localities we established two study plots within relatively old stands of unknown origin. Stands were recently broken up by a windstorm. The present situation was described by diameter and decay class distribution. To...
Gross value yield potential of coppice, high forest and model conversion of high forest to coppice on best sites
M. Kneifl, J. Kadavý, R. Knott
J. For. Sci., 2011, 57(12):536-546 | DOI: 10.17221/32/2011-JFS
Based on yield tables for oak high forest and oak coppice (both first site class) and using assortment tables and assortment prices in the Czech Republic in 2009, a set of variants of conversion of high forest to coppice was simulated. Average annual cut and average gross value of annual cut of such conversions were compared with those of well-established (in terms of the age structure balance) variants of coppice and high forest. Under the existing ratio of assortment prices, established coppice does not reach the gross value yield of high forest. No variant of simulated conversions was more financially profitable than the initial high forest. Furthermore,...
Drought and aluminium as stress factors in Norway spruce (Picea abies) seedlings
K. Slugeňová, Ľ. Ditmarová, D. Kurjak, J. Váľka
J. For. Sci., 2011, 57(12):547-554 | DOI: 10.17221/30/2011-JFS
Effects of drought, Al and their possible interaction on physiological characteristics were studied in four-years-old Norway spruce seedlings in a pot experiment. Drought stress was imposed by withholding irrigation. Al was applied to the soil as an AlCl3 solution at a concentration of 1,500 μmol.l-1. Water deficit caused a decrease in needle water potential, net photosynthetic rate (Pn) and an increase in proline accumulation. On the other hand, water potential, Pn and proline concentration in seedlings subjected to Al remained unchanged. During the experiment, no significant variation...
Testing of microbial additives in the rooting of Norway spruce (Picea abies [L.] Karst.) stem cuttings
I. Repáč, J. Vencurik, M. Balanda
J. For. Sci., 2011, 57(12):555-564 | DOI: 10.17221/21/2011-JFS
Laboratory-produced alginate-bead inoculum of ectomycorrhizal (ECM) fungi Cortinarius sp. and Gomphidius glutinosus, fungal commercial products ECtovit® and Trichomil®, bacterial commercial product BactoFil B®, and commercial rooting stimulator Vetozen® were applied to a peat-perlite (1:2, v:v) rooting substrate of Norway spruce stem cuttings collected from 4-year-old nursery-grown seedlings immediately before the insertion of cuttings into the substrate. The application of beads free of fungi and the substrate without an additive were the other treatments. The cuttings were...
Economics of a hydraulic hammer for forest road construction in a mountainous area
A. Parsakhoo, S. A. Hosseini, M. R. Ghaffariyan
J. For. Sci., 2011, 57(12):565-573 | DOI: 10.17221/59/2011-JFS
This research deals with productivity and cost of rock disintegration and side casting of materials with the use of a hydraulic hammer mounted on a PC 220 Komatsu crawler excavator, which is used on rocky slopes of Hyrcanian forests of Iran. A continuing time study was applied during the road construction. To estimate the volume of rock disintegration, the average end area equation was used. The increasing cut-slope height decreased productivity. The productivity of hydraulic hammer averaged at 5.5 m3.h-1 for the mean work volume of 5.07 m3.m-1. The unit cost of the system was 7.7 €.m-3. From...
Possibilities of homogenization of the kerf width created by the technology of abrasive water-jet cutting
R. Kminiak, Š. Barcík
J. For. Sci., 2011, 57(12):574-579 | DOI: 10.17221/61/2011-JFS
The paper deals with the possibilities of homogenization of the kerf width by proper choice of the respective feed rate and abrasive mass flow for particular models of cutting. The introductory part is devoted to reasons for the kerf width variability in dependence on the models of cutting, as well as to the methods of determining the kerf width in cutting of solid wood by abrasive water jet. In the conclusion are presented the results concerning the development of kerf width in the range of commonly used feed rates and abrasive mass flows.