Journal of Forest Science, 2011 (vol. 57), issue 2
Effect of Melampsora larici-populina on growthand biomass yield of eight clones of Populus nigra
V. Benetka, K. Černý, P. Pilařová, K. Kozlíková
J. For. Sci., 2011, 57(2):41-49 | DOI: 10.17221/51/2010-JFS 
This study evaluates the effect of the identified pathogenic races E1, E2 and E3 of the leaf rust Melampsora larici-populina on some growth traits and biomass yield in the species Populus nigra. A field trial was conducted with 8 clones of P. nigra using fungicide-sprayed and unsprayed treatments in 3 replications of 4 plants. In the course of three years the occurrence of the rust was evaluated on a six-point scale. The plant height and stem diameter were measured during the trial. In the last year the plants were harvested and the dry weight was determined. In the untreated plants a significant negative correlation was...
Small mammals of a forest reserve and adjacent stands of the Kelečská pahorkatina Upland (Czech Republic) and their effect on forest dynamics
J. Suchomel, J. Urban
J. For. Sci., 2011, 57(2):50-58 | DOI: 10.17221/2/2010-JFS
The community of small terrestrial mammals (STM) was studied on seven experimental plots characterizing forest stands in various stages of succession development and with different level of management from plantings through production/commercial stands to a forest reserve. Increased attention was paid to dominant species and their effects on the dynamics of the forest reserve. In total, eight species of STM were detected with the highest dominance and abundance of Apodemus flavicollis and Myodes glareolus. The total relative abundance of STM was significantly highest in plantings (P < 0.05). A. flavicollis was...
Red deer density in the air-polluted area of forest ecosystems in the Krušné hory Mts. - Klášterec nad Ohří Forest District
Z. Vala, M. Ernst
J. For. Sci., 2011, 57(2):59-63 | DOI: 10.17221/57/2010-JFS
The density of red deer in the area of forest ecosystems disturbed by air pollution in the Krušné hory Mts. - Klášterec nad Ohří Forest District was determined in two model hunting districts Jelení hora and Černý potok. To determine the density of red deer two methods were used, namely the clearance plot method and a method without the clearance of transects - faecal standing crop. Based on the repeated counting of faecal pellet groups on 16 marked plots (No. 1 to 16) in the research area, mean values of the estimate of the red deer population density were determined in the Jelení hora hunting district in 2007 and 2008 using the FSC method, viz 24...
Evaluation of squared timber and log products in the Hyrcanian Forests of Iran
S.M. Hosseini, B. Majnounian, A. Skoupý
J. For. Sci., 2011, 57(2):64-69 | DOI: 10.17221/90/2009-JFS
The forests located in the northern areas of Iran are known as Hyrcanian Forests and are distributed across three provinces, namely Gilan, Maznadarn and Golestan. These provinces are situated in the north of Iran near the Caspian Sea. Timber products in the said forests during the last two decades were markedly different so that the total timber harvested in the first decade was 1.6 million m3 on average, however, in the second decade it nearly amounted to 1 million m3. Two major timber products of Iran are studied and compared in this research, namely logs and squared timber. Squared timber products averaged 10.7% during the first decade,...
Spatially constrained harvest scheduling for strip allocation under Moore and Neumann neighbourhood adjacency
M. Konoshima, R. Marušák, A. Yoshimoto
J. For. Sci., 2011, 57(2):70-77 | DOI: 10.17221/47/2010-JFS
Adjacency constraints can be represented by Moore or Neumann neighbourhood adjacency, depending upon how candidate neighbours are assigned at corners adjacent to the target cell. Considering Moore and Neumann neighbourhood adjacency, we investigate the effect of strip cutting under a shelterwood management scheme with adjacency requirements among strips. We compare the effect of creating a strip window within a management unit with the same spatially constrained problem without a strip window. The management scheme comparison is considered as a spatially constrained harvest scheduling problem, which is solved with CPLEX software using an exact solution...
Comparison of automatic and interactive thresholding of hemispherical photography
A. Inoue, K. Yamamoto, N. Mizoue
J. For. Sci., 2011, 57(2):78-87 | DOI: 10.17221/68/2010-JFS
This study presents the effects of operator bias and variation in interactive thresholding on the estimation of light environment using hemispherical photography. Twenty-one hemispherical photographs taken beneath a wide range of canopy densities were visually converted to binary images twice by 21 operators, and then the gap fraction was computed from the images. The interactive threshold varied greatly among the different operators and within a single operator, which resulted in a considerable operator bias and variation in the gap fraction. This study also compared three widely used automatic thresholding algorithms, which were installed in freely...