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The time within which, accordingly to its application, machine works, and an object of work and working groups are under load, is the effective active time. The purpose of the research was the order statistics of effective active time of limbing and conversion at chainsaw use. The removed trees were moderately diversified from the point of view of effective active time of limbing and conversion. The...
The paper presents an analysis of surveys conducted in companies using willow Salix Viminalis for energy production in the Podkarpacie province, it shows that companies are interested in the production of energy from biomass. The use of willow as a renewable energy source for the production of energy from biomass is a very good solution. The respondents claim that insufficient number of producers...
The essence of conducting a forest nursery production is high quality planting material. Its essential element is rational fertilization of plants grown and conscious use of available methods and fertilizer application. Studies on the effects of fertilization on the growth of Norway spruce (Picea abies (L.) Karst.) can be used by foresters to properly choose the fertilizer needed to achieve the target...
The paper presents the results of laboratory research on the effects of different soil compaction caused by varying unit pressure and its impact on germination and growth parameters of common beech. Soil for the research was taken from the forest stand, and then poured into prepared PVC cylinders. Pressure was exerted on the soil with use of the stamp, on a specially prepared static stand. Unit pressure...
In all, 105 impressive lime trees were inventoried in the Lipka commune of which Tilia cordata Mill. (95 trees) turned out to be the most numerous. The remaining taxa T. ×europaea L., T. platyphyllos Scop. and T. tomentosa Moench had only a very small share. Majority of valuable limes (67) were found to grow along district, local and dirt roads forming avenues. Lime trees in good and very good health...
The aim of this paper was inventory of the wild service tree (Sorbus torminalis), a very precious but, at the same time, one of the least known species of homeland wooded plants in the Taczanów Forest Inspectorate (Poznań Regional State Forest Directorate). The inventory was conducted from May 2010 to March 2011. The result of the inventory are 1127 specimens, of which 209 are strong mature trees...
The aim of this study was to determine changes in temperature found during short-term seedling storage on shelves kept on racks under different cover materials. Analyses assessed the effect of different materials for covering of loading space on interior temperature changes. Collected results were to supply information on the effect of this factor on the quality of seedling material in view of specific...
The study was to provide information on changes in humidity during short-term storage of seedlings on shelves in containers covered with different materials. Collected results made it possible to specify how the type of material of loading space coverings influences changes in the interior humidity. This made it possible to determine the effect of this factor on quality of seedling material under...
Wieloletni program badawczy, prowadzony na stałych powierzchniach doświadczalnych, pozwolił opracować lokalny bonitacyjny model wzrostu drzewostanów sosnowych (PINUS). Na podstawie odpowiednio wyselekcjonowanego, pod względem ilościowym i jakościowym, materiału empirycznego oraz po pogrupowaniu drzewostanów o podobnym tempie wzrostu, dobrano najlepsze funkcje regresji. W ostatecznym wyborze funkcji...
Projektowany rezerwat „Bełczańskie Starorzecza” jest położony w dolinie Odry na odcinku o długości 19 km i powierzchni ok. 1700 ha. Obszar ten jest chroniony w ramach sieci obszarów Natura 2000, jako część OSO „Łęgi Odrzańskie”. Rośnie tu 45 gatunków roślin drzewiastych z 19 rodzin. W dendroflorze dominują gatunki rodzime (85%), najczęściej związane ze zbiorowiskami roślinnymi typowymi dla dolin rzecznych...
W czasie inwentaryzacji przyrodniczo-leśnej z terenu Polski wykazano 1597 stanowisk czerwończyka nieparka oraz 111 stanowisk czerwończyka fioletka. Struktura siedlisk, po analizie zebranych materiałów, wskazuje na większe uzależnienie czerwończyka fioletka od wilgotności, w porównaniu z L. dispar, i na mniejsze ich zróżnicowanie. W pracy przedstawiono propozycje postępowania ochronnego mającego na...
Wieloletni program badawczy prowadzony na stałych powierzchniach doświadczalnych pozwolił skonstruować lokalny referencyjny model wzrostu drzewostanów (PINUS ZIELONKA). Na podstawie materiału empirycznego, odpowiednio wyselekcjonowanego pod względem ilościowym i jakościowym, dobrano funkcje regresji. W przypadku zależności stochastycznych, kiedy wartości przyjmowane przez zmienną zależną są obarczone...
The aim of this study was to determine the influence of soil preparation on height of 3-year-old Scots pine plantation. Three methods of cutting residues management and three methods of soil preparation were analysed. Height structure was determined and mean heights in specific variants were statistically analysed. Conducted analysis showed, that the influence of soil preparation method was much greater...
This paper presents the results of studies on the influence of soil preparation methods and ways of utilization of logging residues on belowground biomass of 3-year-old Scots pine saplings, after artificial regeneration. Statistically significant correlations were detected between root biomass and soil preparation methods, while there was no significant impact of logging residues management. Furthermore,...
One of the main dendrometric characteristics of Scots pine is the height increment. This characteristic is used to assess the condition of trees and determine radial increments in considered periods. Meteorological conditions have a large impact on the length increments, both during formation of buds and during tree growth. The duration of sunshine is one of the factors influencing the weather, thus...
Black cherry (Prunus serotina Ehrh.) belongs to quite common and the best known invasive woody plants of alien origin occurring in central Europe. On the other hand, little is known about the degree of settling of another North American representative of the Prunus genus from the Padus subgenus – the chokecherry (P. virginiana L.). A considerable morphological similarity of the above-mentioned taxon...
The study compared basic density, compressive strength along the grain, static bending strength and modulus of elasticity of juvenile wood in pines from different Kraft’s classes. Analyses were conducted in 8 mature pine monocultures in north-western Poland. In each experimental site a total of 9 trees were selected, thus the analyses were conducted on 72 model trees (with 24 for each social class...
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