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    Wyświetlanie 1-2 z 2
    Tytuł:
    Stopień uszkodzenia drzewostanów świerkowych Gór Sowich
    Damage to spruce stands in the Sowie Mountains
    Autorzy:
    Dmyterko, E.
    Kluziński, L.
    Bruchwald, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/990883.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Gory Sowie
    drzewostany swierkowe
    uszkodzenia drzewostanow
    swierk pospolity
    Picea abies
    uszkodzenia drzew
    korony drzew
    reakcje przyrostowe
    warunki srodowiska
    degree of damage
    growth response
    picea abies
    poland
    Opis:
    The aim of the research was to assess the degree of damage to spruce trees and stands and to study their growth responses to the changing environmental conditions in the Sowie Mountains (Central Sudety Mts.). To assess the degree of damage to trees, three methods based on crown characteristics were used. The types of growth responses of trees to changing environmental conditions were additionally taken into account in one of the methods. Regardless of the assessment method, spruce stands in the Sowie Mountains demonstrated a high level of damage. The poorest growth conditions were found in the period 1966−1980 when a large number of trees showed negative growth responses, indicating a decrease in radial increment. The period 1996−2010 showed an improvement in the growth conditions of trees because the proportion of trees with negative growth responses decreased, while the proportion of trees with positive growth responses increased. It was also found that the growth conditions for spruce were more favourable in the lower montane forest zone (above 600 m a.s.l.), and less favourable at the foothills (below 600 m a.s.l.), which may be caused by the competition of beech replacing spruce in the lower locations in the mountains.
    Źródło:
    Sylwan; 2014, 158, 03; 173-182
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stopień uszkodzenia drzewostanów jodłowych Beskidu Niskiego
    Degree of damage to silver fir stands in the Beskid Niski Mts.
    Autorzy:
    Dmyterko, E.
    Bruchwald, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/989946.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany jodlowe
    uszkodzenia drzewostanow
    jodla pospolita
    Abies alba
    uszkodzenia drzew
    korony drzew
    reakcje przyrostowe
    warunki srodowiska
    radial increment
    environmental changes
    primary crown
    secondary crown
    abies alba
    Opis:
    The main aim of the research was to study trees growth responses to the changing environmental conditions and to assess the degree of damage to trees taking into consideration their secondary crown. Based the material from plots established in 12 silver fir stands (tab.), chronologies were developed for trees in various age classes (fig. 1). 1950 saw a downward trend in the radial growth that continued till 1985, to be followed by an upturn lasting till 2000, when the radial growth stabilised. No significant changes in tree−growth were observed in the group of the youngest trees. Three types of growth response to environmental changes (positive, neutral and negative) were distinguished in the last three 15−year−long periods. In years 1970−1984 the largest proportion of firs indicated negative growth responses, while firs with positive response dominated in the period 2000−2014 (fig. 2). The period 1970−2014 saw a steady increase in the mean value of growth responses. The assessment of the top−crown growth (feature B) showed that more than 50% of the trees showed inhibited growth (fig. 3). The assessment of tree vitality (feature C) confirmed the dominance of trees with moderate crown vitality. The vitality of the secondary crowns (Zw) situated below the primary crowns (Zp) of firs was assessed on the basis of crown density and its length (formula [1]). Incorporating Zw in the assessment of tree damage (formula [2]) resulted in an increase in the vitality of the whole crown (Z) (fig. 4). Based on the defoliation, 73% of trees were found to be within damage class 2 (fig. 5). Another method of damage to trees determination was adopted (formula [3]) to assess the damage to fir stands and showed that the largest proportion of trees was with moderate damage (fig. 6). The damage index values obtained with this method were lower compared to the method that considers the defoliation exclusively. Even lower index values were obtained while using the method based on both damage index W and tree−growth response. Of the three discussed damage assessment methods, the most accurate is the method based on damage index Wz, taking into account the growth response of the entire crown (Z).
    Źródło:
    Sylwan; 2015, 159, 11; 893-904
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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