Journal of Forest Science, 2007 (vol. 53), issue 5
Spontaneous hybrids within the genus Abies - growth and development
V. Janeček, J. Kobliha
J. For. Sci., 2007, 53(5):193-203 | DOI: 10.17221/2177-JFS 
Spontaneous hybrids within the genus Abies are considered to be better in growth and vitality in comparison with Abies alba and parental species. Three plantations with this material were established in the Czech Republic. These plantations are regularly measured and examined. The results show a very high potential of this material for the purposes of Czech forestry practice.
Effect of hydrogel application on survival and growth of pine seedlings in reclamations
M. Sarvaš, P. Pavlenda, E. Takáčová
J. For. Sci., 2007, 53(5):203-209 | DOI: 10.17221/2178-JFS
In this study results of hydrogel application in reclamations are presented. The application of hydrogel affected the survival of pine seedlings during two vegetation periods after planting. Double application of STOCKOSORB AGRO (gel) on the root system after lifting caused an about 19% higher survival rate compared to control variants. The application of 7 g/planting hole of STOCKOSORB MICRO granules caused overdosage and plant mortality. The application of hydrogel granules is simple but it is very complicated not to cause the overdosage because of the very high swelling capacity of hydrogel. Research should be carried out to determine suitable hydrogel...
Quality selection in young oak stands
L. Chroust
J. For. Sci., 2007, 53(5):210-221 | DOI: 10.17221/2174-JFS
The paper deals with an experiment that was established at Opočno Experimental Station of the Forest and Game Management Research Institute (CR) in an oak small pole stage in 1952 to test whether Schaedelin'’s (1942) tending method worked out for beech stands is suitable for oak stands. Development and growth of the oak stand without tending are analysed, and the influence of repeated positive selection and of definitive selection of target trees on the oak stand is described. The result of the 50-year experiment is that Schaedelin's tending method is suitable also for oak stands. However, it is rational only if the choice of candidates...
Utilization of digital photogrammetry in forestry mapping
Š. Žíhlavník, F. Chudý, M. Kardoš
J. For. Sci., 2007, 53(5):222-230 | DOI: 10.17221/2176-JFS
At present, photogrammetric interpretation of aerial images is a dominant method of forestry mapping. In the last years, transition from analogue to digital photogrammetry has been distinct. Digital photogrammetry enables to achieve workflow effectivity, and so to decrease the final product costs. The objective of the submitted paper was to evaluate the availability of digital photogrammetry for the forestry mapping rationalization. Digital aerotriangulation using the ImageStation SSK system brings more accurate results without requirements for the use of a larger amount of control points. The results also demonstrated the use of colour infrared aerial...
Determination of the pressing parameters of spruce water-resistant plywood
J. Hrázský, P. Král
J. For. Sci., 2007, 53(5):231-242 | DOI: 10.17221/2175-JFS
The paper summarizes results of operations aimed at determining the pressing parameters of spruce water-resistant plywood and testing the suitability of particular constructions of plywood. Constant and variable parameters were determined. In pressed plywood sheets, the shearing strength of gluing according to EW 100 and the coefficient of compressibility were determined. In pressing, heat transmission through the set of veneers was analyzed and effects of the moisture of veneers on heat transmission were tested. The percentage of resin hardening was also determined. Results were statistically analyzed. The dependence was determined of shearing strength,...