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    Wyświetlanie 1-2 z 2
    Tytuł:
    Przestrzeń pojedynczego drzewa w drzewostanie panującym w zależności od wieku oraz typu siedliskowego lasu na przykładzie modrzewia (Larix decidua Mill.)
    Single tree space in a dominant stand in relation to age and forest habitat type on the example of larch [Larix decidua Mill.]
    Autorzy:
    Kaźmierczak, K.
    Pazdrowski, W.
    Nawrot, M.
    Szymański, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1009015.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    dendrometria
    drzewostany panujace
    wiek drzew
    klasy Krafta
    drzewa lesne
    modrzew europejski
    Larix decidua
    przestrzen wzrostu
    przestrzen pojedynczego drzewa
    siedliska lesne
    siedlisko boru mieszanego swiezego
    siedlisko lasu mieszanego swiezego
    growth space
    crown
    age
    habitat type
    biosocial position
    larix decidua
    Opis:
    The study presents the results of the MANOVA investigation on single tree growth space. The study included 48 larch trees in a dominant stand of different age classes growing in the fresh mixed coniferous (BMśw) and fresh mixed broadleaved (LMśw) forest habitats. The space occupied by a single tree was calculated for each larch tree as the volume of a cylinder with a height equal to the height of a tree, while the base area was determined from the average crown radius. Basic statistical characteristics were established. The MANOVA was performed to assess the statistical significance of the impact of forest habitat type, age and biosocial position of trees in a stand. A similar analysis was done for two basic measurement characteristics of trees – diameter at breast height and height.
    Źródło:
    Sylwan; 2010, 154, 11; 764-772
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Struktura lasów w Polsce na podstawie danych wielkoobszarowej inwentaryzacji stanu lasu
    Structure of forests in Poland based on National Forest Inventory data
    Autorzy:
    Jabłoński, M.
    Wysocka-Fijorek, E.
    Budniak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/987174.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Polska
    lasy
    struktura lasu
    inwentaryzacja lasu
    inwentaryzacja wielkopowierzchniowa
    powierzchnie probne WISL
    drzewostany
    cechy taksacyjne
    gatunki panujace
    struktura pionowa
    struktura wiekowa
    forest structure indicators
    forest description
    nfi
    Opis:
    In most of European countries, basic information about forests that is used for its monitoring and formulation of national policies comes from the National Forest Inventories (NFIs). Assessment of forest resources at the national level was initiated in Poland in 2005. In 2014, the second cycle of NFI was completed. Since 2010, results of NFI are the main source of information about the amount of forest resources in Poland, their structure and condition. In the paper, we analyse the indicators of forest structure. Classification of forest categories (forested, temporary non−forested, related to forestry), vertical stand structure, species composition and age structure determined directly from NFI's sample plots were compared with descriptions of stands in which plots are located. Data from more than 29,000 NFI sample plots measured in 2010−2014 were analysed. Our results demonstrate that the share of temporary non−forested areas (resulting from manage− ment practices) assessed from NFI plots is higher than this based upon the stands description (3.9% and 1.8% respectively). We also observed that results of NFI show the huge discrepancy in percentage of land related to forestry (forest roads generally) in forests of private property comparing to cadastral data (1,2% and 0,04% respectively). Most of forests in Poland (92% based on NFI) are single−layer stands. But it should be emphasised that NFI indicate more than twice higher share of two−layer stands (4.8%) than that resulting from description of stands in which samples are located (2.2%). However, only one third of NFI plots located in two−generation and uneven−aged stands was assessed in the same way. On 80% of sample plots dominant species was in accordance with stand description. On 85% plots there were compatibility of the age of dominant species with age recorded in forest management plans. The results of our research confirm that description of the entire diversity of forests by any of the indicators is not practically possible. Simplifying the forests description occurs during NFI measurements as well as within forest management planning. However, some issues need clarification and additional analysis when NFI is used as a source of forest structure. NFI plots with maximal size of a few hundred square meters seem to be too small to observe vertical structure of stands. On the other hand, it should be recog− nized whether division of the sample plots into smaller sections does not cause overestimation of the area of temporary non−forested land.
    Źródło:
    Sylwan; 2017, 161, 04; 267-276
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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