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    Wyświetlanie 1-4 z 4
    Tytuł:
    The stand structure and natural regeneration of Abies alba Mill. in reserves on the northern margin of its distribution in SW Poland
    Autorzy:
    Szymura, T H
    Powiązania:
    https://bibliotekanauki.pl/articles/41400.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    stand structure
    natural regeneration
    Abies alba
    silver fir
    Wal Trzebnicki area
    distribution
    seedling density
    stand type
    Abietetum polonicum
    mixed forest
    population structure
    safe site
    Polska
    Opis:
    The silver fir (Abies alba Mill.) in the area of Wał Trzebnicki is at the northern limit of its distribution in western Poland. This study was performed in three nature reserves with protected silver fir populations. The stands in these reserves were mixed, with complex spatial structure and abundant tree regeneration. The proportion of fir in stands was around 16% of DBHS, the age of trees reached around 130 years. The silver fir occurs mainly in the sapling stage, whereas the number of seedlings was very low. The results of this study show the influence of forest floor vegetation as well as litter type on the emergence of fir seedlings. The seedlings density was compared with the results of other studies from different geographical areas and stands type in Poland.
    Źródło:
    Dendrobiology; 2007, 57; 55-62
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of land relief and soil properties on stand structure of overgrown oak forests of coppice origin with Sorbus torminalis
    Autorzy:
    Szymura, T.H.
    Szymura, M.
    Pietrzak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/41135.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    land relief
    soil property
    stand structure
    overgrown coppice oak
    oak forest
    coppice
    Sorbus torminalis
    regeneration
    forest management
    Opis:
    Traditional forest management as coppicing and coppicing-with-standard are recently considered as beneficial for biodiversity in woodlands. Cessation of coppicing leads to changes in stand structure and often loss of biodiversity. In contemporary Polish forestry coppicing is not applied, however some stands of coppice origin persist in Silesia until present. The overgrown coppice oak forests that cover the southern slopes at the foothills of the Sudetes Mountains (Silesia, Central Europe) are considered to be Euro-Siberian steppic woods with a Quercus sp. habitat (91I0): a priority habitat in the European Union, according to the Natura 2000 system. They support one of the largest populations of wild service tree (Sorbus torminalis Crantz) in Poland. In this study we investigated the relation of stand structure and trees parameters with environmental variables. The results showed considerable variability of stand volume, tree density and stems’ size correlated mostly with soil texture, but not nutrient content. We attributed it to soil dryness which seems to be the crucial factor controlling growth of trees. The natural regeneration of trees concentrated mostly on non-exposed sites on less acidic soils, but seedlings of wild service tree were present almost exclusively on most insolated sites, with shallow acidic soils. However, the regeneration of trees in sapling stage was restrained by browsing. Results suggest that maintaining of Sorbus torminalis requires protection against browsing, and some kind of active management is necessary to retain the observed stand structure with high proportion of wild service trees in stands on more fertile soils.
    Źródło:
    Dendrobiology; 2014, 71
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and dynamics of a mature tree stand in submontane alluvial forest of Carici ramotae-Fraxinetum in the Sudety Mts foothills (Lower Silesia, Poland)
    Autorzy:
    Szymura, T.H.
    Buszczak, M.
    Szymura, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/41381.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Opis:
    The structure andd ynamics of a submontane alluvial forest, with structural attributes of old-growth, in the Sudety Mts, Central Europe were examined. Stand structure was measured in circular sampling plots, and the distribution of gaps in belt transects. Past dynamic was reconstructed on the basis of analysis of events of release from suppression by inspection of growth pattern. The age distribution of canopy trees was also surveyed. The stand was dominated by ashes (Fraxinus excelsior) aged77–151 years, which created the upper layer, whereas the lower layer was dominated by dense hazel (Corylus avellana) shrubs. The analysedstandwas developedin site which was usedas a grasslandin first quarter of XIX century, but its history include several fine-scale disturbances when canopy trees were established. Recent dynamic was related to low intensity gap formation. The light conditions at the forest floor were good, and the average percentage of PPFD was 13%. Seedlings of ash and sycamore (Acer pseudoplatanus) were abundant throughout the stand. However, continuous browsing by game prevented growth of seedlings; in the sapling layer sycamore had disappeared and the number of ash saplings was strongly reduced. Regeneration was dominated by hazel of vegetative origin both in gaps and under the canopy.
    Źródło:
    Dendrobiology; 2010, 63
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The spatial pattern and microsites requirements of Abies alba natural regeneration in the Karkonosze Mountains
    Autorzy:
    Szymura, T H
    Dunajski, A.
    Aman, I.
    Makowski, M.
    Szymura, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/41501.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Karkonosze Mountains
    Norway spruce
    Picea abies
    silver fir
    Abies alba
    microsite requirement
    natural regeneration
    age structure
    browsing
    safe site
    seedling dispersal
    spatial distribution
    Opis:
    Progeny of four adult silver firs, which were an admixture in Norway spruce (Picea abies) stand was, analyzed. The study was done in lower mountain zone of the Karkonosze (Giant Mts.) National Park (SW Poland). The seedlings occurred in two clumps related to the position of adult trees, whereas spatial pattern of the seedlings inside each clump was random. The seedlings were spaced mainly in distances 5–25 from the nearest adult tree. The maximal distance was up to 50 m. Most seedlings were established in accordance with main wind directions. Also, in these directions seedlings were more distant from adult trees than in other directions. The seedlings grew in better light environment (12% of PPFD) than average (9,6% PPFD). This effect was statistically significant. The height increment of the seedlings was low and was not correlated with light conditions. Similarly, there was not any correlation between the apical dominance ratio and light. The lack of this correspondence we attributed to browsing. The silver fir seedlings were significantly underrepresented in patches of Vaccinium myrtillus, on raw needles, under crown of adult trees and in concave micro-relief form. The underrepresentation in the places covered by canopy and in patches of bilberry we related to the indirect effect of continuous browsing, which leads to higher seedlings mortality in more shaded places and sites of stronger competition between forest floor vegetation and silver fir seedlings.
    Źródło:
    Dendrobiology; 2007, 58; 51-57
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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