Journal of Forest Science, 2010 (vol. 56), issue 2

Analysis of the aerial application of fertilizer and dolomitic limestone

M. Bošeľa, V. Šebeň

J. For. Sci., 2010, 56(2):47-57 | DOI: 10.17221/29/2009-JFS  

The paper evaluates the quality of revitalization treatments (fertilization and liming) carried out in selected areas within Forests of the Slovakia (state enterprise) during the year 2008. Revitalization treatments were carried out in declining Norway spruce forest stands in different site conditions. Full-scale aerial technology (helicopter and crop duster) was applied. The aim of the study was to find out the total amount and its variability of both fertilizers and dolomitic limestone after their application. The analyses revealed significant differences between the amount of fertilizer and dolomitic limestone which was applied to selected areas...

The influence of Picea abies on herb vegetation in forest plant communities of the Veporské vrchy Mts.

F. Máliš, J. Vladovič, V. Čaboun, A. Vodálová

J. For. Sci., 2010, 56(2):58-67 | DOI: 10.17221/39/2009-JFS  

Natural mixed beech-fir forests were quite widely replaced by spruce dominated stands in Slovakia. Given the demands on the assessment of the forest status as well as on stopping the biodiversity loss it is required to evaluate the influence of Picea abies (L.) Karst. on the species composition. In a case study from the Veporské vrchy Mts. natural beech dominated forests were compared to stands with different spruce proportion. Within three groups of relevés with no, less and more than a half proportion of Picea abies the species diversity and Ellenberg indicator values were compared. The response of particular species to the proportion...

Which factors explain lepidopteran larvae variance in seasonal guilds on some oaks?

M. Turčáni, J. Patočka, M. Kulfan

J. For. Sci., 2010, 56(2):68-76 | DOI: 10.17221/54/2009-JFS  

Differences between the oak lepidopteran communities were studied in Slovakia in 1993 and 1994. Sampling was undertaken between April and October on 3 oak species. Biological traits of larvae were examined in order to explain differences in seasonal guilds among oaks. Cluster analysis shows similarities between communities in the flush feeder guild where the results were influenced mainly by temporal variability; in the late spring guild mainly by site; factors influencing summer feeder and autumn feeder similarities remain unclear. Detrended Correspondence Analysis (DCA) was used to investigate the main gradients explaining variability in communities....

Arginine and the shade tolerance of white spruce saplings entering winter dormancy

D. J. Durzan

J. For. Sci., 2010, 56(2):77-83 | DOI: 10.17221/57/2009-JFS  

Shade-tolerant white spruce saplings grown at 100, 45, 25, and 13% natural light for four years, and entering winter dormancy, modified their growth habit and redistributed the total soluble N among needles, roots, and stems with buds mainly to arginine N. Most free amino acid N was found in roots in saplings at full light, and the least at 13% light. Glutamate, glutamine, and aspartate N contributed to the accumulation of soluble arginine N. Arginine-derived γ-guanidinobutyric acid, agmatine and an unidentified guanidino compound accumulated mainly in stems with buds at 25 and 13% light. The profiling N metabolism and arginine-derived guanidino...

Analysis of the accuracy of GPS Trimble JUNO ST measurement in the conditions of forest canopy

M. Klimánek

J. For. Sci., 2010, 56(2):84-91 | DOI: 10.17221/32/2009-JFS  

GPS Trimble JUNO ST was tested at 16 points under forest canopy. The measurements were done on three different dates of the growing seasons in 2007 and 2008. On each date, 4 recordings were measured in the length of 1, 2, 5, and 10 minutes with the recording frequency of 5 seconds. The resultant data were statistically evaluated by analysis of variance (ANOVA) both for data before corrections and for data after post-process corrections from the reference station. The tested GPS receiver reaches the average mean square error of the measurement of XY coordinates in the interval of 2.7 up to 5.1 m (without corrections and depending on the time...