Search results for: M. Niemczyk
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The influence of ruderal species and crop density on ancient segetal weeds was examined. The experiment was carried out on experimental plots with three different sewing densities of winter triticale. Weeding of ruderal taxa was applied on half of the plots to explore the relation between segetal and ruderal weeds. Variation in species composition by environmental variables was analysed by running...
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Polish Journal of Ecology > 2017 > 65 > 3
Taxus baccata is a rare species throughout its entire natural range and is often categorized as nationally threatened in countries where it occurs. In Poland yew is under protection and almost all sites with yew occurrences are subject to reserve protection. The aim of the study was to answer the following questions: What is the tree diameter structure of stands in three yew reserves? What is the...
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Polish Journal of Ecology > 2017 > Vol. 65, nr 3 > 369--384
Taxus baccata is a rare species throughout its entire natural range and is often categorized as nationally threatened in countries where it occurs. In Poland yew is under protection and almost all sites with yew occurrences are subject to reserve protection. The aim of the study was to answer the following questions: What is the tree diameter structure of stands in three yew reserves? What is the...
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Knowledge of diameter at the breast height (DBH), tree height and form factor allows to estimate tree volume, which is one of the most important measures in forestry. The paper presents empirical equations for the determination of DBH form factor of different species and hybrids of Populus sp. The study was set up on short−rotation plantation in Wichrowo Forest District (northern Poland). Four poplar...
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Within this paper a methodology for the assessment of energy and resource consumption within manufacturing processes is described and two case studies from the automotive sector were evaluated. On basis of the Life Cycle Assessment approach the energy and material flows within single manufacturing processes were acquired concerning the two selected case studies. With the generated knowledge about...
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In Poland, the majority of silver fir stands is characterised by a single−layer stand structure. The current silvicultural activities aim at obtaining multilayer stands, which requires a clearer definition of the structure, and more precisely, a better knowledge of the pattern of diameters at breast height (DBH) distribution. The aim of the research was to develop a pattern of DBH distribution of...
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The study presents a method of planning species composition of forest stands in mountain areas on the example of Beskid Niski Mts. (south−eastern Poland). The focus was on the species composition of forest stands growing in different conditions, taking into account the type of forest habitat and terrain characteristics: altitude, exposition and slope. The research was based on data stored in the Information...
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The use of biomass for energy purposes is an important European Union policy. In light of the restrictions concerning the use of the full−value wood from forests for energy purposes, short rotation forestry can become an alternative source of woody biomass. In this context, the most promising species is poplar (Populus spp.), productivity of which depends on various aspects such as plant spacing,...
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The paper presents the dendrochronological analysis of silver firs (Abies alba Mill.) growing in the canopy layer of the forest stands. We searched for the similarities in the rhythm of radial growth of studied trees and we analysed the response of these stands to the increment disturbances related to the occurrence of adverse climatic factors and the pressure from industrial pollution. The research...
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Mobbing i dyskryminacja to słowa, które wzbudzają coraz więcej kontrowersji ze względu na powszechność występowania we współczesnych przedsiębiorstwach. Zjawiska te odnoszą się do stosunków międzyludzkich, a szczególnie interakcji prowadzących do wielopostaciowych konfliktów. Kończą się one zazwyczaj szykanowaniem, poniżaniem, jednej ze stron, co wywiera destrukcyjny wpływa na jej psychikę i osobowość...
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The paper compares the proportion of damaged stands managed under group cutting system (group clear cutting and group shelterwood cutting) with the analogous stands where cuts had not been performed. The empirical material came from the database of the State Forests Information System and covered all forest districts located in Polish lowlands. To evaluate the group cutting a test of differences between...
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Silver fir is one of the main tree species of mountain and foothill forests in Poland that in optimal conditions forms pure stands with multi−layer structure. The study objective is to present differences in height and diameter growth rates of firs growing in upper stand layers and in the undergrowth. The research was conducted in 12 fir stands located in the Beskid Niski Mts. (southern Poland). In...
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This study evaluated the environmental risk drivers affecting the occurrence of cockchafer grubs in mature stands bordering with open spaces. The following factors were taken into the consideration: the distance from the edge towards the forest interior, the forest site type, species composition, canopy openness and the cover of forest floor with vegetation as well as cutting treatment in some of...
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Assuming multilayer structure as optimal for silver fir stands, we attempted to answer the following questions: 1) how to describe such structure, 2) to what extent does the structure of a particular stand differ from the optimal one, and 3) how to obtain the optimal structure. The study was based on the material collected in 12 stands in the Nawojowa Forest District (S Poland). Three to five 0.04...
