Ustav pro hospodarskou upravu lesu Brandys nad Labem

Plzeň, Czech Republic

Ustav pro hospodarskou upravu lesu Brandys nad Labem

Plzeň, Czech Republic
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Sloup M.,Ustav pro hospodarskou upravu lesu Brandys nad Labem | Lehnerova L.,Ustav pro hospodarskou upravu lesu Brandys nad Labem
Zpravy Lesnickeho Vyzkumu | Year: 2016

The aim of the study was to determine the response of Scots pine stands from natural regeneration to different tending regimes. The group of stands used for the purpose is situated in the Plasy Forest District on acidic site. The plot was stumped and bulldozed after felling in 1987. In 2003, the experimental site was divided into separate tending treatments such as 1K-control without thinning, 3Pú -thinning from below and 2ú-thinning from above. In the same year, 3Pú was implemented to reduce the number of trees to ca 5,000 per hectare. The calculation of thinning intensity per basal area was followed by tending measure implementation on plots intended for 2ú at the same intensity. The 1K was left without thinning. The subject of the paper is the response of trees to the implemented tending measure (number, diameter at breast height, height, and basal area) over 10 years. Results show that the thinning from below is suitable for the production maximization, and the thinning from above offers the cost saving, the space for natural processes and the higher diameter increment of target trees.

Pulkrab K.,Czech University of Life Sciences | Sloup M.,Ustav Pro Hospodarskou Upravu Lesu Brandys Nad Labem | Sloup R.,Czech University of Life Sciences
Forestry Journal | Year: 2014

The article presents selected results of the project of the Czech National Agency for Agricultural Research, "Differentiation of intensities and management practices in relation to forest biodiversity and economic sustainability of forestry" executed at the Department of Forest Economy and Forestry Management, Faculty of Forestry and Wood Sciences, Czech University of Agriculture in Prague. The results included the quantification of forest rotation periods derived from total mean increment, total mean value increment, and annual gross profit of forest production. Significant differences between the rotation period currently recommended and the rotation period relevant to economic optimum (maximum) were observed. The better the forest site (site quality class), the bigger is the difference. © 2015 by Karel Pulkrab.

In the case study from the basin of the Šance reservoir in the Moravian-Silesian Beskids, we examined the differences in the extent of damage in individual winter seasons and differences in the quantity of snow in individual situations. The intensity of damage to predominantly spruce stands was evaluated as the ratio of the number of individual trees damaged in the particular season to the total number of trees in the study plots. The quantity of snow was measured using quantitative parameters of snow cover. The objective of this paper was to describe model scenarios characterised by the expected intensity of stand damage corresponding to the course of winter expressed in quantitative parameters of snow cover on the base of similar/dissimilar situations. Individual winter seasons were thoroughly described in the results. The output is the description of three model scenarios with different intensities of stand damage that differ in the measured values of snow quantity. © 2015 by Štěpán Křístek.

Pulkrab K.,Czech University of Life Sciences | Remes J.,Czech University of Life Sciences | Sloup M.,Ustav pro hospodarskou upravu lesu Brandys nad Labem
Zpravy Lesnickeho Vyzkumu | Year: 2010

Models of management measures and direct costs of cultivation and felling operations have been constructed within the research project 1G58031 "Importance of close-to-nature silvicultural systems for the forest stability and production and non-production forest functions". For the purpose a model arrangement was established at the forest stand 626/A9/01b in the forest district Klokocna, Forest enterprise Kono-piste belonging to Forests of Czech Republic, state company. The comparison shows that considerable cost saving in cultivation operations can be influenced significantly by used felling technology. Also, costs of harvester technologies fluctuate depending from the provider and/or supply-and-demand situation. Total direct costs of the two compared management practices in the investigated forest stand are similar in case we admit the possibility to do approximately 20 % of felling operations in the shelterwood management with harvester technologies. With (hypothetical) increasing this ratio the shelterwood system becomes more cost-effective than clear-felling system.

MacKu J.,Ustav Pro Hospodarskou Upravu Lesu Brandys Nad Labem
Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis | Year: 2012

Forest stands naturalness degree represents the real tree species composition comparison with the tree species on natural vegetation level - It means forest typology units. The natural tree species composition is derived from Typological System of UHUL (Forest Management Institute). The degree of naturalness of forests is one of the attributes for the assessment of the ecological stability of forests, whilst the broader basis for analysis of sustainable development of the territory. The real tree species composition comes from the forest management planes database and the natural potential vegetation one from typological sites units (forest site complex). Forests types complex is a higher unit of this system hierarchy. The solution based on comparison of the real species composition with natural potential vegetation, e.g. forest stands naturalness degree, is to be used in the ecosystem platform way. The preparation of entry data, e.g. allocation of structured stand type code to the real and natural species composition precedes the analysis itself. Then follows the tree species index calculation which means the final sum of tree index present and any absent species. This index presents the diff erence between the real tree condition and the model one. It is used entirely original concept algorithm of structured stand types. This algorithm allows for the application computer technology and process so the range from forest stand group of up to the large territory (CZ). The naturalness degree classification is defined on 0-6 levels, from zero degree for introduced species, 3rd degree for cultural forests, to 6th degree for those with natural tree composition. The limited criterion is the stand naturalness degree which should be on 4 th level and above. This method is for 15 years of application not only in the works of forestry sites typology completely worked.

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