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    Wyświetlanie 1-4 z 4
    Tytuł:
    Pakietowanie pozostałości zrębowych nowym sposobem wykorzystania biomasy leśnej do celów energetycznych
    Bundling of logging residues - a new method to use biomass for energy purposes
    Autorzy:
    Chlebowski, K.
    Jabłoński, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1006454.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    surowce energetyczne
    biomasa lesna
    pozostalosci zrebowe
    pakietowanie
    energy wood
    logging residues
    wood harvesting
    slash bundler
    Opis:
    Woody fuels are perceived as an important potential renewable source of energy in Poland. With about 25 thousand ha of clear−cut every year, it is possible to collect over million tons of woody fuels in form of logging residues, which is usually left behind after timber and industrial wood have been taken away. The technology using slash bundlers for bundling logging residues is an interesting option to produce a woody fuel ready for burning. Logging residues bundles differ in their dimensions and weight depending on the bundling machine used for the operation. As the technology utilises green branches and tree tops for producing bundles, it may lead to losses in the amount of certain chemical elements in the forest site thus negatively affecting the future forest generations. The complexity of the problem calls for intensive research into the problem of using logging residues as a source of energy.
    Źródło:
    Sylwan; 2012, 156, 04; 315-320
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Udział oraz dokładność szacowania pozostałości zrębowych w ogólnej masie pozyskanego drewna
    Share and accuracy of estimation of logging residues in the total volume of harvested timber
    Autorzy:
    Gendek, A.
    Wężyk, P.
    Moskalik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/986464.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    pozyskiwanie drewna
    pozostalosci zrebowe
    miazszosc
    biomasa drzewna
    szacowanie biomasy
    timber harvesting
    forest biomass
    logging residues
    estimation
    Opis:
    Due to the observed impacts of climate change on the natural environment, the demand for energy from renewable sources is growing, especially in the last decades. One of the possibilities in this respect is the use of forest biomass, especially that one which comes from logging residues. This type of wood raw material is obtained primarily in mature forests and during late thinnings. Estimation of the expected volume of logging residues from a particular cutting site is currently carried out in the State Forests, National Forest Holding with an accuracy oscillating at an acceptable level of ±40%. The purpose of this study was to estimate the share of logging residues in the total volume of the harvested biomass and to determine the difference and error between the estimated volume to be sold and actually harvested. The research was carried out at the 164 logging sites located in 10 forest districts of north−eastern part of Poland. The average volume of logging residues was 37.7 ±14.4 m3/ha, and the average error of their estimation was –6.1%.
    Źródło:
    Sylwan; 2018, 162, 08; 679-687
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ biomasy pochodzącej z resztek pozrębowych na właściwości gleb
    Effect of biomass from the post-harvest logging residues on soil properties
    Autorzy:
    Błonska, E.
    Kacprzyk, M.
    Wróblewska, K.
    Lasota, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/979193.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    biomasa
    zagospodarowanie
    leśnictwo
    pozostałośći zrębowe
    gleby leśne
    włąsciwości chemiczne
    właściwości biochemiczne
    aktywnośc enzymatyczna
    soil biochemical properties
    enzymatic activity
    post−harvest residues
    Picea abies
    Opis:
    The aim of the study was to determine the effect of different management treatments of Norway spruce post−harvest logging residues on soil properties. The study compared the impact of residues chipping and arrangement into the stacks. The investigation was carried out in the Nowy Targ Forest District (southern Poland). 15 research plots were selected for the analysis (5 plots with wood chips, 5 with stacks and 5 control ones). In May 2018, on each research plot soil samples for laboratory analysis were collected from the surface horizon (0−10 cm depth). Basic properties (pH, carbon and nitrogen content, base cations content) and enzyme activity (dehydrogenase, urease and−glucosidase) were determined. The obtained results confirm the influence of post−harvest logging residues management on soil properties. The significant differences in soil carbon content between soils of different plots variants were noted. Soils of research plots with wood chips and stacks were characterized by higher content of carbon compared to the control research plots. At the same time soils with post−harvest logging residues had a higher biochemical activity expressed by enzymatic activity. The nutrients released from decaying post−harvest logging residues stimulated the microbiological activity of the soils.
    Źródło:
    Sylwan; 2020, 164, 02; 110-117
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ technologii pozyskania i składu zrębków leśnych na ich wartość opałową i zawartość popiołu
    Effect of harvest method and composition of wood chips on their caloric value and ash content
    Autorzy:
    Gendek, A.
    Malatak, J.
    Velebil, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/986640.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    biomasa lesna
    zrebki drzewne
    pozyskiwanie biomasy
    skladowanie
    wartosc opalowa
    zawartosc popiolu
    forest biomass
    forest residues
    composition of chips
    share of ash
    forest chips
    Opis:
    Wood chips composition and abundance of the impurities affecting the ash content are parameter of the chips quality that is important for the power plants. These parameters may be used as criteria in settlements between the supplier and the chipmaker. The determination of calorific value, ash content and share of individual elements in forest chips was undertaken. The wood chips obtained from the fragmentation of sawmill wastes and forest trees residues with various species compositions (Scots pine, multi−species and bundled Norway spruce residues) were investigated. The linear relationship between the ash content and the calorific value of the chips was determined. In all cases, the largest share (over 87%) in the composition of forest chips is assigned to the clean timber and wood particles with bark. The share of mineral impurities is within the range of 0.6−1.6%. The ash content in wood particles ranges 1.04−3.94% and is close to the values reported in the literature. In terms of ash content, the chips produced from bundled coniferous residues were the worst. The obtained results indicate that the best technology for obtaining high calorific value of dry wood chips (17.89−18.11 MJ/kg) with a low proportion of ash is the chipping of wood residues collected directly from the forest surface or from previously prepared piles. The least advantageous technology is the bundling of residues and their storage for several months (16.29 MJ/kg).
    Źródło:
    Sylwan; 2018, 162, 03; 248-257
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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