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Wyszukujesz frazę "stand volume growth" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Porównanie zmienności cech taksacyjnych drzewostanów sosnowych pomiędzy obszarami różniącymi się poziomem zanieczyszczeń przemysłowych na Niżu Polskim
Comparision of the variability of pine stand appraisal properties in areas with different levels of industrial pollution in the Polish Lowlands
Autorzy:
Węgiel, A.
Powiązania:
https://bibliotekanauki.pl/articles/1015988.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany sosnowe
zanieczyszczenia przemyslowe
cechy taksacyjne
klasy wieku
wysokosc przecietna
przyrost miazszosci
lesnictwo
Niz Polski
zanieczyszczenia powietrza
piersnice drzew
zasobnosc drzewostanu
zmiennosc
pinus sylvestris
coniferous forests
industrial pollution
tree height
dbh
stand volume growth
standing
volume
polish lowlands
Opis:
The paper contains the results of the analyses of four properties (average tree height, average dbh, standing volume, average stand volume growth) of pine stands growing on poor sites in the territory of the Polish Lowlands. The comparison of four relative values of the analysed properties among four 20−year age classes was performed. The obtained results were referred to the level of industrial pollution.
Źródło:
Sylwan; 2007, 151, 04; 26-35
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
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 1-3 z 3

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