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    Wyświetlanie 1-3 z 3
    Tytuł:
    Dendrochronologiczna analiza przyrostów radialnych choiny zachodniej (Tsuga heterophylla Sarg.) z Pomorza Zachodniego (Nadleśnictwo Dobrzany)
    Dendrochronological analysis of radial growth of western hemlock (Tsuga heterophylla Sarg.) from Western Pomerania (Dobrzany Forest District)
    Autorzy:
    Glawenda, M.
    Koprowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1006599.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewa lesne
    dendrochronologia
    choina zachodnia
    Tsuga heterophylla
    przyrosty radialne
    analiza dendroklimatyczna
    Pomorze Zachodnie
    Nadlesnictwo Dobrzany
    dendroclimatology
    tsuga heterophylla
    poland
    Opis:
    Western hemlock (Tsuga heterophylla Sarg.) is an exotic species rarely encountered in Poland. The study site was located in the territory of the Dobrzany Forest District, in the oldest stands of this species in Poland. The research material comprised 20 wood samples from 10 trees aged 78 years. The chronology was built covering the period between 1942 and 2009. Indicator years were determined and dendroclimatological analysis was performed. Thermal conditions in January and February and the amount of precipitation in July and February influenced the tree−rings width. Missing rings were detected in 30% of wood samples in 1982.
    Źródło:
    Sylwan; 2012, 156, 04; 287-293
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena fragmentacji lasów Pomorza Zachodniego pomiędzy XV a XX wiekiem
    Evaluation of the forest cover fragmentation in Western Pomerania between the 15th and 20th century
    Autorzy:
    Pieńkowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/989791.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    lasy
    fragmentacja lasu
    spadek lesistosci
    Pomorze Zachodnie
    wiek XV-XX
    forest fragmentation
    land use changes
    landscape metrics
    Opis:
    The paper analyzes the changes of forest fragmentation in the Western Pomerania region (NW Poland). The analysis was carried out basing on maps from 16th and 18th century as well as 1930s, when the forest cover in the studied area was the lowest. The historical area of forests was assessed on the basis on Hartnack utilization maps. The analysis of numerical maps was carried out in the GUIDOS program, which enables to evaluate the fragmentation of the forests through Morphological Spatial Pattern Analysis (MSPA) that describes the geometry of patches and their interconnectivity. The program calculated the forest areas classified for the seven categories according to their functions in the landscape (MSPA classes). In the 15th century the forests coverage was around 52.5%. There was a significant loss of forest area between the 16th and 18th century, and in the 18th century they occupied 24.7% of the researched area. Because of the economic changes in the country that took place after the World War II, the forest area in Pomerania increased to 33.7%. It was found that changes in the forest area in the examined period resulted in a decrease in the area classified as forest interior (CORE) and an increase in the boundary area (EDGE). Taking into account the equidistant of 1 km², the area occupied by the core patches dropped in the analysed period from 59.9% to 35.6%. At the same time the spatial isolation of many patches increased, which was reflected in an increase in the area classified as ‘islands' (ISLET). Their share in relation to the entire forest area increased from 4.4% to 23.6%. This could be particularly seen in the area of Pyrzycko−Stargardzka Plain and Choszczno Lakeland, where in the 1930s the so−called forest islands constituted the entire forest area of these mesoregions. The MSPA analysis enabled to specify forest patches classes, which can be useful for landscape characterization, including the patch and corridor model. The fragmentation of forests can be objectively assessed using GUIDOS and it can make the output results obtained in GIS programs complete.
    Źródło:
    Sylwan; 2015, 159, 07; 610-616
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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