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    Wyświetlanie 1-5 z 5
    Tytuł:
    Sąsiedztwo i następstwo gatunków drzew w Białowieskim Parku Narodowym
    Neighbourhood and succession of tree species in the Bialowieza National Park
    Autorzy:
    Gazda, A.
    Miścicki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/986644.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    parki narodowe
    Bialowieski Park Narodowy
    lasy
    drzewa lesne
    gatunki roslin
    wspolwystepowanie
    sasiedztwo roslin
    nastepstwo roslin
    warstwa macierzysta
    warstwa odnowienia
    suma miazszosci drzew
    suma wysokosci drzew
    analiza kanoniczna
    regresja wieloraka
    avoidance
    canonical analysis
    co−occurrence
    life strategy
    overstorey
    regeneration layer
    Opis:
    The diversity and sustainability of species composition are important topic of forest research. The possibility to observe the coexistence of tree species in a given forest patch and their succession in the next generation is limited because there are few forests unaffected by management activities. For this reason, the study was conducted in the oldest part of the Białowieża National Park, called Strict Reserve. The purpose of the research was to determine the relationship between the quantity of individual tree species in the overstorey (the standing volume of trees with the diameter at breast height d8 cm) and regeneration layer (the total height of trees with the diameter at breast height d8 cm or height h1.3 m) as well as the relationships between those stand layers. Multiple regression and canonical analysis were used to determine the relationships between 12 tree species (tab. 1). The research material was the results of measurements of 920 concentric sample plots conducted in 1995 and 2005. In the overstorey, the correlation coefficient between the standing volume of a given tree species on sample plots and the standing volume of other tree species assumed for each species both significant positive values (species ‘co−occurrence'), significant negative values (species ‘avoidance’) and close to zero values (fig. 1). The same was true for the regeneration layer (fig. 2). In eight cases the correlation between the total height of trees of a given species in the regeneration layer and the standing volume of trees from the overstorey showed the highest positive values when referred to the ‘regeneration−overstorey' relationship of the same species (fig. 3). The same referred to the ‘overstorey−regeneration' relationship (fig. 4). Eight of the canonical variables turned out to be significant (tab. 2). For the first canonical variable, standing volume of hornbeam in the overstorey (Gb_m) showed the highest absolute value of the loading factor in the first dataset, while the variable the total height of hornbeam trees in the regeneration layer (Gb_o) – in the other dataset (fig. 5). The total redundancy was 20.7%, which means that such part of the variance of the total height of individual tree species in the regeneration layer could be explained by their standing volume in the overstorey. The sequence of tree generations understood as the relationship between species composition of the regeneration and overstorey layers was associated with life strategies of tree species.
    Źródło:
    Sylwan; 2018, 162, 03; 209-219
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prognoza zmian składu gatunkowego drzewostanów Białowieskiego Parku Narodowego
    Forecast of changes in the tree species composition of forest stands in the Bialowieza National Park
    Autorzy:
    Gazda, A.
    Miścicki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/989230.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Bialowieski Park Narodowy
    drzewostany
    sklad gatunkowy
    dorost
    ubytki
    miazszosc drzew
    przyrost miazszosci
    zmiany skladu gatunkowego
    prognozy
    increment
    ingrowth
    hornbeam
    mortality
    size−class model
    strict protection
    volume
    Opis:
    The studies initiated by Włoczewski in 1936 revealed changes in the species composition of forest stands in the Białowieża National Park. This led to the question about what these changes would be in the future. The aim of our study was to predict changes in the volume of tree species in the so called Strict Reserve in the Białowieża National Park over the period of 40 years. A size−class growth model was developed for this purpose. The average merchantable timber volume for each of the eleven taxa was calculated for the successive 10−year intervals, and the increase in standing volume as well as the volume of tree loss (mortality) and ingrowth were calculated for these intervals. The empirical material was taken from the permanent and temporary sample plots. The permanent plots (160) were measured in 2000, 2002, 2004 and 2011. The empirical data were used to determine, separately for each species, the relationship between trees dbh and mortality (fig. 1), diameter growth (fig. 2) or the rate of saplings (height of 0.3−1.3 m) growth into the first dbh class (0.1−1.9 cm). The temporary sample plots (460) were measured in 1995 and 2005, and the data were used to validate the size−class growth model and predict timber volume in the period 1995−2005 (tab.). The results of the validation may indicate significant changes in standing volume for the majority of tree species in the period 2005−2045 (fig. 3). In 2045, hornbeam will dominate. The volume increment in the period 2005−2045 will remain at almost the same level, the volume of tree loss will decrease and the volume of ingrowth will slightly increase, beginning from 2015 (fig. 4). Only five taxa will have a significant share in the ingrowth throughout the period 2005−2045, of which approx. 85% will be hornbeam in the period 2035−2045 (fig. 5). The observed changes in the species composition of forest stands in the Białowieża National Park may be the result of global, regional as well as local factors such as the pressure of herbivorous ungulates on young trees. Anticipating changes in the structure of forest stands may be useful in planning the protection of forest areas by reducing the impact of local factors on forest stands (regeneration) in an indirect way.
    Źródło:
    Sylwan; 2016, 160, 04; 309-319
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prognoza rozwoju drzewostanów lasu naturalnego z wykorzystaniem modelu według klas wymiarów
    Forecast of the development of natural forest resources using a size-class growth model
    Autorzy:
    Gazda, A.
    Miscicki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/972934.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany
    buk zwyczajny
    Fagus sylvatica
    Abies alba
    modele wzrostu
    las naturalny
    prognozowanie rozwoju
    Roztocze
    leśnictwo
    Bukowa Góra
    jodła pospolita
    model wzrostu według klas wymiarów
    silver fir
    increment
    mortality
    Roztoczański National Park
    European beech
    Opis:
    The size−class growth model is an empirical model applicable for the prediction of the dynamics of natural forest growth. It is based on the following assumptions: (1) changes in the forest condition are determined on the basis of the sum of the changes that take place in individual size classes, (2) the trees in a given class are represented by single average tree, (3) the calculation of the future tree density distribution in size classes (fig. 1) is the main element of the prediction, and (4) the future tree density distribution is estimated on the basis of the initial structure, actual growth and mortality of trees in individual size classes. The aim of the research was to develop a size−class growth model to be used for the preparation of a medium−term forecast of natural forest dynamics. The study site is located on the Bukowa Góra Mt in the Roztoczański National Park (SE Poland). For the analyses we took all uneven−aged stands (128 ha in total) composed mostly of silver fir and European beech. The material was collected on 65 permanent sample plots every five years in the period 1991−2011. Trees with the breast height diameter (DBH)8 cm were measured on each sample plot (500 m2), while smaller trees – on three smaller concentric plots. We calculated, separately for fir and beech, the relationship between the mortality of trees and their diameter (fig. 2), the relationship between the diameter increment of trees and their DBH (figs. 3−4), the rate of saplings (h=0.3−1.3 m) growth into the first DBH class (DBH=0.1−1.9 cm). On the basis of these data, we elaborated a size−class growth model that we used to predict the development of timber resources (trees with DBH 8 cm) at 10−year intervals in the period 2001− −2041. In 2011, the predicted average standing volume was lower than the one actually measured. The forecast indicated an increase in the average standing volume (fig. 5), a reduction in the volume of ingrowth (fig. 6), an increase in the proportion of beech in the standing volume and ingrowth (figs. 5 and 7) and the maintenance of a similar density structure (fig. 8) throughout the period 2001−2041. The low accuracy of the prediction after 10 years (in 2011) was caused by the difference between the predicted and actual values of tree growth and mortality in the period 2001−2011.
    Źródło:
    Sylwan; 2016, 160, 03; 207-218
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przekształcanie drzewostanów robiniowych w rezerwacie przyrody - koncepcja i realizacja
    Black locust stands’ conversion in a nature reserve – conception and execution
    Autorzy:
    Gazda, A.
    Miscicki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/880628.pdf
    Data publikacji:
    2012
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Leśny Zakład Doświadczalny. Centrum Edukacji Przyrodniczo-Leśnej w Rogowie
    Źródło:
    Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej; 2012, 14, 4[33]
    1509-1414
    Pojawia się w:
    Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tree species diversity and above-ground biomass of natural temperate forest: montane versus lowland forest
    Autorzy:
    Gazda, A.
    Miscicki, S.
    Chwistek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/41218.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    tree
    plant species
    species diversity
    aboveground biomass
    temperate forest
    mountain forest
    lowland forest
    species richness
    Opis:
    We studied the relationship between tree-species diversity and the above-ground biomass on an example of two natural Polish forest with different altitiudinal range, plant species pool, vegetation and climatic conditions. The study sought to determine whether: (1) above-ground biomass in natural forests correlates with tree-species diversity irrespective of the kind of forest (montane or lowland), and (2) the relationship in question is negative, (3) the above-ground biomass is greater in montane forests than in lowland ones. Natural forests present in 1º Polish Gorce Mountains (montane forest) alongside comparable data for the 2º world-renowned lowland forest that is present in the Białowieża National Park. Data were collected within 558 sample plots (á 200-square-metre). The diameter at breast height of all trees with girths of or exceeding 12 cm was measured. To compute above-ground biomass we calculated dry masses for each tree on the basis of values for dbh and height, next we summed these values for all species present within each plot. The number of tree species on a plot ranged from only one (mainly in spruce stands) to six (in mixed deciduous lowland forest stands). The above-ground accumulated biomass ranged from 6 to 1155 (average 251±13) t ha–1 within the lowland forest, and from 2 to 849 (average 242±8) t ha–1 within the montane forest. We concluded that there was a humped-back shaped relationship between tree-species diversity and above-ground biomass in both lowland and montane natural forests.
    Źródło:
    Dendrobiology; 2015, 73
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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