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Konopka J.,Narodne Lesnicke Centrum Lesnicky Vyskumny Ustav Zvolen
Forestry Journal | Year: 2010

Development of forest utilization as a wood producer and a source of non-wood products is characterized. Special attention is paid to public beneficial (non-production) forest functions. Multifunctional (functionally integrated) forest management is defined. Current situation in its implementation and related barriers are given. They are particularly lack of finances in forest sector when almost 80% of revenues come from the sale of raw wood material. It is proposed to incorporate public beneficial forest functions to economic mechanism of the subjects managing forests and to secure these activities as properly paid services.

The paper is aimed at enhancing the quality of information obtained from forest and land, particularly to identify and eliminate systematic bias of existing information and to correct and update them using a small-scale control sampling. Attention is drawn to the procedure known as ŽList Sampling". A digital forest of an area over 1600 ha was created, in which a correct as well biased (from -15 up to -25%) information on basal area of 257 stands are simulated. There are tested three ways of the sampling of control forest stands (simple systematic sampling, and PPS and PPP sampling). In the forest stands, the simulation of real basal area is done using the software STIPSI and the results are processed employing the adequate algorithm (Regression, Ratio, and PPS and PPP). Comparing the biased, revised and correct data, statistical as well as real confidence intervals for all the tested variants are derived and knowledge of their properties and conditions for its wider practical use is formulated.

Vegetation index NDVI derived from satellite data MODIS (product MOD09) was used for monitoring of phenological phases of beech stands. The effect of leaves of upper story and undergrowth trees, understory vegetation, bark of thin and thick branches, trunk, and litter on NDVI value was identified and quantified for determination of the onset of phenological phases in five beech stands. The phenological observations were carried out in the spring 2011. Phenological curves were modelled for each stand. Inputs were NDVIsat derived from MODIS. The NDVI value for each component was determined from spectral analyses, and its percentage was estimated. Consequently, NDVImodel values were calculated for each stand and compared with NDVIsat. We found out that NDVIsat values are systematically biased from NDVImodel values a quotient q was established to revise this biased NDVIsat values. Possibilities for satellite long-term phenological monitoring resulted from the quantified effect of individual forest components on NDVI value. The 100% leaf onset is the most suitable phase for phenological monitoring of the canopy trees component. The 100% leaf budburst is suitable phenophase for monitoring of forest stands phenology.

Zauskova L.,Fakulta Prirodnych Vied Univerzity Mateja Bela | Midriak R.,Institute Vyskumu Krajiny A Regionov Centrum Vedy A Vyskumu UMB | Seben V.,Narodne Lesnicke Centrum Lesnicky Vyskumny Ustav Zvolen
Forestry Journal | Year: 2012

The contribution brings detail characteristics of the so-called white areas. It aims to describe white areas on the basis of selected attributes of agricultural land (such as typological-productive categories of agricultural land, potential level of cost-effectivness at crops growing, primary, secondary and other agricultural soil funds) and to compare these results with the results of procedures applied in the APVV project Waste lands and landscape abandoning in Slovakia as well as to highlight discrepancies in delimitation of both forest and agricultural soil fund. Nearly 80% of the Slovak white areas is situated on potential uneconomic agricultural soils, most of white areas (70%) is situated on the other agricultural soil fund and 25% of forests on non-forest land are not registered in the agricultural soil fund.

The paper is a contribution to the research on problems of thinning in mixed (spruce-fir-beech) stands situated in the 5th altitudinal vegetation zone (beech with fir) in the central part of Slovakia. The research was carried out on two series of permanent research plots established in 1972. Each of the series consists of three partial plots. Free crown thinning was used for tending one plot as a part of whole-area tending. On the second plot a non whole-area tending was realised and/or the third one was left without planned silvicultural treatment as control. At the turn of years 1993 and 1994 research plots were affected by snow break disaster. Dynamic changes of tree species composition, stand structure, qualitative and quantitative production including silvicultural analysis of eight thinning interventions were evaluated for the period of 34 years. Special attention was paid to the development of future crop trees, which are the main bearers of stand quality and quantity. The changes were compared with respect to differences between the plot with whole-area and non whole-area long-term silvicultural treatment and the control plot (without treatments). Preliminary results showed favourable development of tended plots despite the damage by snow in the past.

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