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    Wyświetlanie 1-2 z 2
    Tytuł:
    Warunki środowiska wpływające na stan zachowania obuwika pospolitego Cypripedium calceolus L. w lasach gospodarczych
    Environment conditions influence on protection status of ladys slipper orchid Cypripedium calceolus L. in managed forests
    Autorzy:
    Czerepko, J.
    Gawryś, R.
    Cieśla, A.
    Sokołowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/991313.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    rosliny chronione
    gatunki zagrozone
    obuwik pospolity
    Cypripedium calceolus
    wystepowanie
    stan zachowania
    warunki srodowiska
    lasy gospodarcze
    endangered species
    natura 2000
    plant ecology
    Opis:
    The paper concerns forest populations of lady's slipper orchid (Cypripedium calceolus L.). The study sites were located in localities with the most numerous populations of Cypripedium calceolus L. in managed forests in Poland. The field studies were conducted in 2012 according to Natura 2000 sites protocols. The aim of studies was the determination of population structure of lady's slipper orchid, especially in indexes reflected number of flowering and fruit plants. The relations between above factors and environmental conditions expressed by ecological indicator values, cover of vegetation layers, species richness, stand age, and intensity of thinning were studies. The obtained results confirmed negative influence of understorey layer and positive influence of density of tree layer on the development of studied orchid populations. The increase in thinning intensity has not significant influence on protection status of Cypripedium calceolus.
    Źródło:
    Sylwan; 2014, 158, 11; 867-874
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Florystyczne i fitocenotyczne wskaźniki stanu zachowania lasów zalewowych w miejskiej dolinie rzecznej
    Flotistic and phytocenotic indicators of the conditions of riparian forests in the urban river valley
    Autorzy:
    Stefańska-Krzaczek, E.
    Podgrudna, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/989701.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    miasta
    doliny rzeczne
    lasy legowe
    stan zachowania
    flora
    bogactwo gatunkowe
    zbiorowiska lesne
    zbiorowiska roslinne
    zespol Ficario-Ulmetum minoris
    Las Pilczycki
    warunki siedliskowe
    urban forests
    disturbed forest
    ficario−ulmetum minoris
    hydrotechnical constructions
    Opis:
    Urban river valleys are exposed to strong anthropogenic pressure, but despite these distortions they provide important habitats in urban areas. Not embanked forests are particularly valuable in urban river valleys as they represent fragments of natural vegetation in a highly changed environment. The study assesses the flora and structure of forest communities in a riparian urban forest complex that is under the direct influence of river water. Las Pilczycki Forest in Wrocław (SW Poland) is such a riparian forest island. We analysed the species richness and composition in terms of the phytocoenoses variability and their syntaxonomic classification. We also investigated if the vegetation can indicate a spatial differentiation in habitat conditions. Floristic and phytosociological data were collected from 70 circular plots (100 m&suo2; each) located in a grid. A total of 81 species were recorded, with a mean of 21 species per plot. Most frequent were: Acer campestre, Acer platanoides, Anemone nemorosa, Ficaria verna, Fraxinus excelsior, Galium aparine, Geum urbanum, Impatiens parviflora and Sambucus nigra. In biological spectrum the most numerous were hemicryptophytes, megaphanerophytes and geophytes. The number of alien species was minor (9% of the flora). The most frequent anthropophyte was Impatiens parviflora. Soil moisture, acidity and fertility indices exhibited spatial correlations and they were higher in the western part of the forest. The moisture index was also higher in the northern part. Species richness ranged from 13 to 32 (with a mean of 21 species). Two forms of Ficario−Ulmetum minoris were identified: with Galanthus nivalis and with Tilia cordata. The first was a well−structured riparian community, while the latter one represented the drained floodplain forest. Vegetation units are spatially separated, in the western part of the forest prevails form with Galanthus nivalis, while in the east – with Tilia cordata. In isolated alluvial forests of urban area local site conditions are crucial for the vegetation patches, because of the distortion of river valleys. The absence of flood embankments is not a sufficient condition for maintaining proper structure of riparian forests.
    Źródło:
    Sylwan; 2015, 159, 01; 82-88
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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