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    Wyświetlanie 1-5 z 5
    Tytuł:
    Struktura czasu pracy harwesterów podczas pozyskania przygodnego
    Structure of the operating time of the harvesters during casual logging
    Autorzy:
    Dvorak, J.
    Walczyk, J.
    Hoskova, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/989858.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    usuwanie szkod
    pozyskiwanie drewna
    harwestery
    struktura czasu pracy
    wydajnosc pracy
    kleski zywiolowe
    harvester
    operational time
    random logging
    productivity
    Opis:
    Natural disasters often cause that large share of acquisitions are performed under contingent conditions. High concentration of raw wood material and urgent need for its rapid removal from the forest demand use of harvesters. Material acquisition in such conditions is much harder and causes loss of performance for working machines. The objective of this paper was to determine the decrease in harvester performance during acquisition of fallen trees, wood scrap and suspended trees compared to acquisition of undamaged trees. Performance analysis was conducted on 10 harvesters from different power class working in the Czech Republic in years 2007−2012. The time structure was determined for the timber acquisition under contingent conditions in 22 forest stands. Later on it was compared with acquisition under normal conditions, i.e. scheduled acquisition on areas with good load carrying capacity and without obstacles and with an inclination up to 33%. There was significant difference in the mean operating time requirements between harvesters from the analysed power classes. Machines form 1st class differed significantly form devices from 2nd and 3rd classed. Results indicate that in spruce stands with wood scrap time consumption increases by 7% when average and high performance harvesters are used. The increase is by 33% during acquisition of fallen trees, while time consumption increases by as much as 79% during acquisition of suspended trees. During acquisition of subversion and wood scrap, performance of average and high performance harvesters ranged between 1.71 up to 17.37 m³/h depending on thickness and type of the damage to obtained trees. Important achievement of presented research is correction factors allowing to change harvester performance standards, while acquisition of fallen trees, wood scrap and suspended trees. Average value of correction factor is 1.19.
    Źródło:
    Sylwan; 2015, 159, 04; 300-306
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zróżnicowanie wielkości ciała wybranych gatunków biegaczowatych w ekosystemach leśnych Puszczy Piskiej zaburzonych przez huragan w 2002 roku
    Body size differentiation in selected carabid species inhabiting Puszcza Piska forest ecosystems disturbed by the hurricane in 2002
    Autorzy:
    Garbalińska, P.
    Skłodowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1013382.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    huragany
    Carabus arcensis
    Carabus violaceus
    kleski zywiolowe
    lesnictwo
    wielkosc ciala
    zmiennosc
    Pterostichus niger
    drzewostany pokleskowe
    owady
    Puszcza Piska
    zgrupowania zwierzat
    biegaczowate
    Carabidae
    body size
    carabus arcensis
    carabus violaceus
    pterostichus niger disturbance
    hurricane
    intraspecific differentiation
    Opis:
    Intraspecific differentiation in body size was investigated for Carabus arcensis, C. violaceus and Pterostichus niger populations inhabiting pine forests disturbed by the hurricane and non−disturbed ones. Post−hurri−cane stands were localized in Szast Reference Forest (Pisz Forest District, NE Poland) disturbed by the hurricane in July 2002 and left "untouched" as an experimental area. Non−affected stands were set in Maskulińskie Forest District (NE Poland). Beetles were sampled using pitfall traps. The hurricane contributed to significant reduction in both C. arcensis and C. violaceus body length. However, an opposite trend was observed for P. niger, which increased considerably in body size in disturbed stands compared to control ones. The most pronounced changes were observed in 2007. Differences in habitat preferences and food resources utilization of C. arcensis, C. violaceus and P. niger are discussed.
    Źródło:
    Sylwan; 2008, 152, 11; 3-15
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ czynników otoczenia na przeżywanie i ubywanie drzewostanów w klasach wieku w przerębowo−zrębowym sposobie zagospodarowania
    The impact of natural and economic factors on the survival and decline of stands in age classes in selection-clear cutting system of forest economy
    Autorzy:
    Poznański, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1012947.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    gospodarstwa przerebowo-zrebowe
    klasy wieku
    kleski zywiolowe
    czynniki biotyczne
    proces ubywania
    lesnictwo
    czynniki decyzyjne
    czynniki abiotyczne
    urzadzanie lasu
    czynniki losowe
    proces przezywania
    factors of the natural and economic environment
    harvest plan
    survival and removal of stands
    age class
    partial cutting system
    Opis:
    The impact of natural and economic factors on the survival and decline of stands by age class was examined in 30 forest stands under a selection−clear cutting system. The results point to economic reasons, particularly a forester's decisions, as factors restraining or allowing unscheduled final cuts. Regeneration of stands is often initiated by unscheduled cuts, particularly by incidental sanitation felling. No final felling is performed in stands under regeneration with scheduled cuts concurrently restrained.
    Źródło:
    Sylwan; 2008, 152, 04; 30-37
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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