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    Wyświetlanie 1-2 z 2
    Tytuł:
    The dynamics of forest species composition in the Eastern Moscow Region
    Autorzy:
    Kiseleva, Vera
    Stonozhenko, Leonid
    Korotkov, Sergei
    Powiązania:
    https://bibliotekanauki.pl/articles/2041639.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    successions
    overstorey
    undergrowth
    spruce
    lime
    Moscow region
    Opis:
    The forests of urbanised areas provide multiple ecosystem services and are highly dynamic. Determining the trends in species composition changes can help to predict their future capacity to fulfil ecological and resource-maintaining functions. We examined the direction of forest successions in the Northeast Moscow region under the canopy of different tree species. Field data were obtained from 78 permanent test plots monitored for more than a 15-year period; field studies were complemented by archival data. The cluster analysis made it possible to divide all plots into five groups by current species composition and structure and into eight groups by the importance of broadleaved species in the undergrowth. Gradual evolution (cohort dynamics) was found to be typical for middle-aged secondary forests; patch dynamics was described in mature stands of late succession species after non-critical natural disturbances; drastic changes were observed in spruce (Picea abies (L.) Karst.) stands after pest attacks. Two main trends were revealed in species composition shift: restoration of mixed spruce-broadleaved forests and development of limedominated broad-leaved forests, the latter being the prevailing one in the stands of composite forest types. Intensive development of oak-associated species is probably related to the climate conditions in the Moscow megacity. The content of this article may be of interest for researchers studying natural forest dynamics and can be used for prospective planning of target species composition in the forestries of the Moscow region.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2020, 62, 2; 53-67
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
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