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    Tytuł:
    Metoda inwentaryzacji lasu oparta na losowaniu warstwowym wykorzystująca model wzrostu drzewostanu
    Forest inventory method based on stratified sampling using a stand growth model
    Autorzy:
    Bruchwald, Arkadiusz
    Dmyterko, Elżbieta
    Mionskowski, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/18055687.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    miąższość drzewostanu
    próba
    ryzyko uszkodzenia
    model wzrostu drzewostanu
    stand volume
    sample
    damage risk
    stand growth model
    Opis:
    The paper presents a new variant of the method for determining the stand volume of age classes in a forest district or inspectorate (subdistrict). The methodological basis for this variant of the method is a branch of mathematical statistics called the "representative method", which is based on stratified sampling, similar to the variant of forest inventory currently used in forestry. In the new variant of the method, strata are formed based on the age of the main tree species and the stand volume, which is determined by the stand growth model, while in the variant currently used, strata are formed based on the stand's main tree species and its age. In the new variant of the stand volume determination method, 13 stages are distinguished, which can be divided into the initial and the main part. First, data from the State Forest Information System (SILP) database are processed: the age of the stand's main tree species and characteristics that allow to determine the volume of each stand of the forest district or inspectorate using a stand growth model. Based on the age and stand volume, strata for the forest district or inspectorate can be formed and the number of samples for each of these strata can be determined. The main part of the new variant of the method starts with the measurement of DBH and tree height on the sample plots. The results of these measurements are then processed using, for example, a stand growth model. The volume of individual strata, age classes, and the entire forest district is determined. When using a growth model, many other stand characteristics are also determined, including volume increment, degree of windthrow hazard, rotation, and 10-year size of final and intermediate fellings. The evaluation of the accuracy of the method was based on data from 73 forest inspectorates in Poland. This was preceded by studies on the dispersion measures of the sum of tree volume on sample plots of different sizes. The new variant of the forest inventory method proved to be about 30% more accurate than the previously used variant.
    Źródło:
    Leśne Prace Badawcze; 2023, 83; 25-32
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamika rozpadu drzewostanów świerkowych w Beskidzie Śląskim
    Decline of Norway spruce stands in the Beskid Slaski Mts.
    Autorzy:
    Dmyterko, E.
    Bruchwald, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/986624.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Beskid Slaski
    drzewostany swierkowe
    zamieranie drzew
    swierk pospolity
    Picea abies
    rozpad drzewostanow
    System Informatyczny Lasow Panstwowych
    model wzrostu drzewostanu
    rozmiar uzytkowania rebnego
    zagrozenia lasu
    szkody od wiatru
    modele ryzyka uszkodzenia
    Nadlesnictwo Wisla
    Nadlesnictwo Wegierska Gorka
    Nadlesnictwo Ustron
    Nadlesnictwo Bielsko
    forest decline
    picea abies
    stand growth model
    harvest volume model
    wind damage risk model
    forest
    threat measure
    Opis:
    The dynamics of decline of Norway spruce forests in the Beskid Śląski Mts. (S Poland) in a 2007−2016 period was analysed based on data from the State Forests Information System. For that purpose we used modified growth model and wind damage risk model. The harvested timber volume (salvage cuts) exceeded the allowable harvest modeled with the stand growth model by 270% in years 2007−2010 (earlier period) and by 89% in the 2011−2016 (later period) period. The highest volume exceed (503 and 307% for earlier and later period respectively) was recorded for the Wisła Forest District. For the deadwood, the harvested volume exceeded the modeled one by 45% (162 in earlier, and 59% in later period). In the Węgierska Górka Forest District the harvested volume amounted to 287% of the modeled one (438 in earlier, and 70% in later period). The largest amount of wind−broken and wind−fallen trees was found in Wisła. Their volume amounted to 48% of the modeled volume (59 in earlier, and 40% in later period). The highest exceed occurred in Węgierska Górka (89 and 70% in the later period respectively). The species composition in the analysed region changed significantly as the share of spruce decreased and share of beech and fir increased (tab. 1). Changes in the aeral fraction of stands in age classes in the Bielsko and Ustroń forest districts were insignificant (tab. 2). For Węgierska Górka, share of stands in age class <20 years increased from 11 to 40%, while the older stands fraction decreased. Major changes occurred in Węgierska Górka and Wisła as far as structure of the stands in the risk damage factor classes is concerned. Fraction for the risk factor classes I and II increased, while for class VI decreased (tab. 3, fig. 4). The highest dynamics of the wind threat measure was recorded especially in Węgierska Górka, where its value decreased from 42 in 2009 to 19 in 2016 (fig. 5). The biggest changes are likely to occur in Wisła in the next years due to the very high fraction of spruce. A significant damage caused by wind may also be expected in Ustroń, where the threat measure is high.
    Źródło:
    Sylwan; 2018, 162, 03; 189-199
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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