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    Wyświetlanie 1-5 z 5
    Tytuł:
    Model wzrostu pierśnicy buka (Fagus sylvatica L.) rosnącego w drugim piętrze drzewostanu bukowo-sosnowego
    Breast height diameter growth model for European beech (Fagus sylvatica L.) growing in the understorey of the beech-pine stand
    Autorzy:
    Dudzińska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/991519.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany bukowo-sosnowe
    buk zwyczajny
    Fagus sylvatica
    piersnice drzew
    modele wzrostu
    diameter growth
    two−storied stand
    fagus sylvatica
    empirical equations
    Opis:
    The study was based on the empirical material collected from 78 beech−pine stands located in the territory of the Miłomłyn (46 plots) and Stare Jabłonki (32 plots) Forest Districts. On the basis of the collected material, a breast height diameter growth model has been developed for the beech growing in the understorey of pine−beech stands. The developed function is an integral part of the growth model for mixed beech−pine stands.
    Źródło:
    Sylwan; 2013, 157, 04; 262-267
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tempo wzrostu wysokości i pierśnicy jodły pospolitej (Abies alba Mill.) w Beskidzie Niskim
    Height and diameter growth rates of silver fir (Abies alba Mill.) growing in Beskid Niski mountains
    Autorzy:
    Bruchwald, A.
    Dmyterko, E.
    Niemczyk, M.
    Łukaszewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/989756.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewa lesne
    jodla pospolita
    Abies alba
    wzrost roslin
    wysokosc drzew
    piersnice drzew
    przyrost piersnicy
    przyrost wysokosci
    tempo wzrostu
    Beskid Niski
    height growth rate
    diameter growth rate
    spatial diversity of canopy layers
    physical age
    abies alba
    Opis:
    Silver fir is one of the main tree species of mountain and foothill forests in Poland that in optimal conditions forms pure stands with multi−layer structure. The study objective is to present differences in height and diameter growth rates of firs growing in upper stand layers and in the undergrowth. The research was conducted in 12 fir stands located in the Beskid Niski Mts. (southern Poland). In each stand height and diameter at breast height (dbh) were measured for 25 fir trees in order to develop a height curve. The first canopy layer included trees that were higher than ⅔ Hmax established from the height curve of the tree with the largest dbh. Height and diameter were measured on eight trees selected from the first canopy layer. An increment core was extracted at breast height in order to estimate the tree age. From the third canopy layer, which included trees higher than 2 m with dbh below 7 cm, five trees were selected. After cutting those trees, the length of the last ten branch whorls was measured. Five−year ring width measurements starting from the bark towards the pith were done at the stem cross−sections obtained at breast height. The number of rings was counted on remaining stumps. Height growth rate was defined as the height at the base age of 100 years (eq. 1). For the first canopy layer, the height growth rate was on average 31.8 m, while for the undergrowth it was 12.1 m. There was also large difference between diameter growth rate of the first stand canopy layer (55.7 cm) and undergrowth (18.3 cm). Both differences were significant at p=0.05. These discrepancies could result from low amount of light reaching the forest floor. The correlation between height and diameter growth rates and undergrowth tree age was negative in both cases. Long periods of shading result in smaller number of firs reaching the first canopy layer. Assuming that uneven−aged stand structure is optimal for that species, it should be characterized by a spatial variability (mosaic) of various canopy layers including even−aged patches with sparse canopy closure as well as gaps where fir regeneration will be initiated having favorable growth conditions.
    Źródło:
    Sylwan; 2015, 159, 10; 804-812
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Struktura i dynamika wielogeneracyjnych starodrzewów sosnowych występujących w obszarach ochrony ścisłej Kaliszki i Sieraków w Kampinoskim Parku Narodowym. Część 2. Procesy zamierania i dorastania oraz ich wpływ na rozkład grubości drzew
    Structure and dynamics of uneven−aged, Scots pine−dominated, old−growth stands in Kaliszki and Sieraków strict reserves in Kampinos National Park. Part 2. Tree mortality and recruitment processes and their effects on tree diameter distributions
    Autorzy:
    Brzeziecki, B.
    Zajączkowski, J.
    Olszewski, A.
    Bolibok, L.
    Andrzejczyk, T.
    Bielak, K.
    Buraczyk, W.
    Drozdowski, S.
    Gawron, L.
    Jastrzębowski, S.
    Szeligowski, H.
    Żybura, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/979128.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    demographic non−equilibrium
    diameter structure
    long−term study
    old−growth forest
    permanent study
    plot
    scots pine
    strict protection
    Opis:
    Two fundamental demographic processes (tree recruitment and mortality) are analyzed for forest stands growing on permanent study plots located in strictly protected Scots pine−dominated, old−growth stands of Kampinos National Park (central Poland). The major implications of the observed demographic trends for the general shape of tree size distributions are determined, as well. During the past ca 30 years, in the stands sampled, there was a pronounced lack of balance between mortality and recruitment processes. Mortality rate was eight times higher than recruitment rate. Eventually, there was a net significant decline in population density, observed for all major tree species, including Scots pine, pedunculate oak, silver and downy birch, and black alder. As mortality processes affected mainly smaller trees, there was also a significant deterioration of the general demographic status of most important tree species. This effect was shown by the change of the overall shape of diameter distributions over the study period: from reverse J−shaped to flat curves running nearly parallel to X−axis. The values of recruitment rates were markedly lower, and the values of mortality rates – significantly higher, than analogous values characterizing comparable forests (e.g., those obtained for the natural stands of Białowieża National Park). Low recruitment rates, as obtained for Kampinos stands, suggest that presently, in the local, Scots pine−dominated, old−growth stands, the general conditions for forest regeneration and for maintaining a long−term demographic stability are unfavorable. Most probably, the regeneration of this type of forest has an episodic, ‘wave−like’ character and corresponds to the ‘catastrophic’ model, according to which the successful regeneration of current dominants (especially Scots pine, silver and downy birch, black alder) must be preceded by a stand−initiating (stand−replacing) disturbance, leading to total or partial, but heavy, destruction of the currently existing stand. At the moment, it would be difficult to predict, however, if and when such a disturbance will affect the stands under investigation. Thus, we predict that in the nearest future at least, the state of overall demographic unbalance will continue or even increase.
    Źródło:
    Sylwan; 2020, 164, 06; 443-453
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wzory empiryczne do określania wieku drzew robinii akacjowej (Robinia pseudoacacia L.) na podstawie obwodu pnia
    Equations for predicting age of black locust (Robinia pseudoacacia L.) based on the tree circumference
    Autorzy:
    Węgiel, A.
    Maliński, T.
    Bocianowski, J.
    Rączka, G.
    Sugiero, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/986973.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    dendrometria
    robinia akacjowa
    Robinia pseudoacacia
    obwod pnia
    wiek drzew
    wzory empiryczne
    tree age
    diameter
    circumference
    growth
    arboriculture
    urban trees
    Opis:
    In Poland black locust grows generally in parks, gardens and along roads and in forests as well. During dendrological inventories specialists often need information about age of a tree. Simple noninvasive methods utilize mainly relation between age and size of a tree. One of such methods is mathematical formula describing relation between tree's diameter (or circumference) and its age. The main objectives of the presented paper is to elaborate such formulae for trees growing either in forests stands or in an open space (single tree, trees alley or small groups). Relations between tree's age and circumference were analyzed on the background of measured trees growing in forests administrated by the State Forests National Forest Holding from a whole territory of Poland. The formulae describing relation between tree's age and circumference were developed based on 20,302 database records for trees growing in forest stands and 6267 records for trees growing in an open space. In both cases power functions showed the best matching (tab. 1) in 95% confidence interval and which lead to construction of the age tables (tab. 2 and 3). Both elaborated formulae were tested and checked out with four series of measurement data. Three control series (1 – ‘Siemianice', 2 – ‘WPN' and 3 – ‘Zielonka') show compatibility with analysed formulae, while the fourth one (4 – ‘Poznan') differed substantially. The probable reason of such situation lies in the fact that this series represented trees growing in urban conditions and having completely different growth rate.
    Źródło:
    Sylwan; 2017, 161, 10; 831-841
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Retrospektywna analiza wzrostu i przyrostu drzew w 30−letnim drzewostanie jodły kalifornijskiej (Abies concolor Eng.)
    Retrospective analysis of growth and increment of trees in 30−years−old stand of white fir (Abies concolor Eng.)
    Autorzy:
    Beker, C.
    Flieger, K.
    Turski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/994778.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany sosnowe
    sosna kalifornijska
    Abies concolor
    wzrost roslin
    dynamika wzrostu
    przyrost wysokosci
    przyrost piersnicowego pola przekroju
    przyrost miazszosci
    white fir
    growth
    height
    breast height diameter
    basal area
    volume
    Opis:
    The paper presents the results of the retrospective research on the height and diameter growth of trees in a 30−year−old white fir (Abies concolor Eng.) stand growing in the mixed broadleaved forest habitat in the Forest Experimental Station in Siemianice. The research concerned the volume and functionally related parameters including height, diameter at breast height and basal area.
    Źródło:
    Sylwan; 2012, 156, 12; 902-907
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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