<abstract xmlns="http://www.w3.org/1999/xhtml"> The research was conducted with a view to establishing physiological parameters of the silver fir (Abies alba Mill.) with regard to germination energy, absolute germination and genetic overload produced by silver fir populations. The intention was to identify significant variability within populations and subpopulations, or rather within the two combined, and to give recommendations on the usage and usability of seeds from specific populations. The results form a basis for establishing silver fir genetic overload within five fir populations of central Bosnia and Herzegovina. The results of research on the characteristics such as absolute seed weight, germination energy and absolute germination are within a scope of previous studies. The studied physiological characteristics of silver fir seeds in the central Bosnia area showed distinct individual and inter-population variability when compared to variability of the subpopulations analyzed. The inclusion of non-physiological data (height, DBH, age and the presence of mistletoe) concerning sampled trees proved to be effective new quality of research. No correlation was found between DBH and seed physiological characteristics but increased tree height had a positive effect on seed quality in terms of absolute germination and growth, proportional to tree height. This in turn shows that seeds should be collected only from trees of above average height, because they are less genetically overloaded. The characteristics of healthy but ungerminated seeds from less tall trees displayed lower parameter values, also indicating that seeds should be collected from taller than average trees only. The presence of mistletoe had a very interesting effect of increasing rotten seeds percentage, and therefore reducing seed quality. Accordingly, seed collection should be limited to trees not affected by mistletoe, however further research on this aspect is required.</abstract>

Genetic overload of silver fir (Abies alba Mill.) from five populations from central Bosnia and Herzegovina

<abstract xmlns="http://www.w3.org/1999/xhtml"> The Gabčíkovo hydroelectric power plant has significantly influenced Danube water regime, thus the condition of floodplain forests in the region. Forest condition has been regularly monitored since 1995 using aerial photos. The subject of this study was to improve the procedure of floodplain forest health evaluation based on digital multispectral aerial images. Firstly, the forest mask was created with overall accuracy 89%, and next, tree health was evaluated using defoliation as health indicator. We applied orthogonal transformation of 4 original bands of multispectral imagery into two-dimensional space. Marginal values of digital numbers (DN) of the first component (New Synthetic Channel - NSC1) were defined by fully foliated willow and poplar. The second component (NSC2) was optimised for damage estimation. Calculated DN values of NSC2 represented a perpendicular distance from the line of DN values of the first component. The distance from the line was proportionate to tree damage extent in a given pixel. We generated linear regression model between pair values of NSC2 and defoliation evaluated for 38 trees in the field, respectively, from aerial photos. A decline prediction resulted in r-square equal 0.86. Finally, we used the model to predict defoliation for each picture element (pixel) of the component NSC2.</abstract>

National Forest Centre, Forest Research Institute, T.G. Masaryka 22, 960 92 Zvolen, Slovakia

Czech University of Life Sciences, Faculty of Forestry and Wood Sciences, Kamýcká 129, CZ – 165 21 Praha 6 – Suchdol, Czech Republic

Improved methods of classification of multispectral aerial photographs: evaluation of floodplain forests in the inundation area of the Danube

<abstract xmlns="http://www.w3.org/1999/xhtml"> The study concerned changing status of water retention within an unique nature complex of the Białowieża Primeval Forest. The retention was evaluated based on an analysis of research results on water outflow from the lowland catchment of the river Łutownia - representative for physiographic conditions as well as those of habitats and tree stands in Poland’s part of the Forest. The catchment in the lowland hydrometric dissection at the Pogorzelce village - Old Białowieża Wilderness, covers the area of 120.1 km2 with natural flow conditions preserved. A unified sequence of measurements carried out since 1966 using unchanged methodology with respect to precipitation, air temperature and forest management status allowed to separate different phases of changes occurring in water resources of this protected forest complex. There were appraised periodical runoff changes and cycles including a decrease in water resources which occurred at the turn of the century. The retention capacity of the catchment was determined based on periodical changes in rainfall-runoff relations and the ongoing process of deteriorating water conditions of forest ecosystem was interpreted.</abstract>

Changes in runoff as an indicative measure of water retention status in the Białowie˝a Primeval Forest

<abstract xmlns="http://www.w3.org/1999/xhtml"> In the years 2005- 2006, in the Karkonoski National Park there were conducted observations on infestation of spruce trees by bark beetles (Col., Curculionidae, Scolytinae). Data on bark beetle species composition and frequency of occurrence of individual species were collected. The data on development phenology of the small spruce bark beetle Ips amitinus in the upper subalpine spruce forest sites (1000- 1250 m a.s.l.) indicated higher frequency of occurrence of this species (26.3%) when compared to the European spruce bark beetle Ips typographus. The study included analyses of population size, density, fecundity and mortality of I. amitinus. The rate of development in I. amitinus in the Karkonosze Mts. is similar to that observed in the Alps. The number of laid eggs observed was low and the reproduction success was very high at minimal mortality. Establishment of feeding galleries and egg laying lasted several weeks and 1/3 of feeding galleries were found in the second series of trap trees.</abstract>

Phenology of development and population characteristics of the small spruce bark beetle Ips amitinus (Eichh.) in the Karkonoski National Park

<abstract xmlns="http://www.w3.org/1999/xhtml"> The paper shows differences in morphological and anatomical features of the Scots pine (Pinus sylvestris L.) growing on former agricultural and forest lands. It was found that at the same age and in the same climatic conditions Scots pines from former agricultural land had larger stem dimensions and needle sizes as compared with the trees growing on forest land. These results lead to an interesting conclusion connected with future afforestation and reforestiation in the Krynki Forest District.</abstract>

Warsaw University of Life Sciences, Department of Forest Botany, Nowoursynowska 159, 02-776 Warsaw, Poland, phone: +48 22 5938028

Krynki Forest District, Poczopek, 16-113 Szudziałowo, Poland

Warsaw University of Life Sciences, Faculty of Horticulture and Landscape Architecture, Department of Ornamental Plants, Nowoursynowska 166, 02-787 Warsaw, Poland

Growth of Scots pine (Pinus sylvestris L.) on forest and former agricultural lands in Krynki Forest District

<abstract xmlns="http://www.w3.org/1999/xhtml"> Variety of radiation power of wildfire was investigated by processing TERRA/Modis imagery in 4 μm spectral band. Fire radiative power (FRP) was used for calibrating high-temperature event database obtained by the satellite technique. An analysis was performed on the database of Siberian wildfires for 2010- 2012. Dynamics of FRP was investigated for a number of wildfires including some cases of crown fire. FRP variation was evaluated for various forest zones of Siberia. Classification of wildfires was elaborated in terms of FRP value as a GIS-layer over the territory of Siberia.</abstract>

Radiative power of wildfires in Siberia on the basis of TERRA/Modis imagery processing

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Folia Forestalia Polonica

 FOLIA FORESTALIA POLONICA SERIES A-FORESTY is published as open access for academic work. All the original articles and review papers published in this journal are free to access immediately from the date of publication. We don’t charge any fees for any reader to download articles and reviews for their own scholarly use. All articles will be published under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International license.  FOLIA FORESTALIA POLONICA, SERIES A – FORESTRY, established in 1957, published quarterly, the science journal addressed to all interested in the exchange of information and the advancement of knowledge in the multidisciplinary field of forestry and environment. The scope of journal covers the broad spectrum of the fields like forestry, agroforestry, environmental and genetic resources management and administrators and policy-makers in forestry.  The language of publication is English and manuscripts from any region of the world are welcome. Papers are selected for publication on the base of their significance of new knowledge or ideas presented.  Journal indexed by Polish Ministry of Science and Higher Education - 40 points for publication.  Abstracts in CABI databases: Forest Science, Forestry Abstracts, Index Copernicus, SCOPUS.   Why subscribe and read     Original articles with the results of unpublished research.  Review articles covering a subject of active current interest.  Methodological articles with new methodological developments of wide significance to forestry.  Short communications with completed description of limited studies.  Commentaries with comments on published papers, books or limited investigations (e.g. international conferences or scientific meetings).   Why submit   high quality editing  constructive review by expert in forest science  available in electronic and print formats  Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 