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    Wyświetlanie 1-8 z 8
    Tytuł:
    Cis pospolity [Taxus baccata L.] w naszych lasach wczoraj i dzis
    Autorzy:
    Dobrowolska, D.
    Farfal, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/813840.pdf
    Data publikacji:
    2002
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    Taxus baccata
    wystepowanie
    ochrona gatunkowa
    cis pospolity
    lesnictwo
    ekologia lasu
    odnowienia naturalne
    ekologia roslin
    drzewa lesne
    Źródło:
    Sylwan; 2002, 146, 07; 37-47
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ budowy strefy ekotonowej lasu na fitoróżnorodność
    Influence of the forest ecotone structure on the phytodiversity
    Autorzy:
    Gamrat, R.
    Gałczyńska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/991132.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    ekologia lasu
    lasy
    ekotony
    roznorodnosc roslin
    Puszcza Wkrzanska
    forest
    ecotone zone
    phytodiversity
    wkrzańska primeval forest
    Opis:
    The objective of the presented studies carried out in the Wkrzańska Primeval Forest (north−western Poland) was to determine the influence of ecotone structure on phytodiversity. Basing on data from three transects, it was shown that the inappropriate structure causes reduction in the number of plant species and communities as compared to typical forest phytocoenoses. It also results in the increase of non−forest flora from nitrophilous and meadow habitats.
    Źródło:
    Sylwan; 2014, 158, 01; 34-40
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    O sukcesji ekologicznej w lasach Jasienia
    Autorzy:
    Kowalski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/821387.pdf
    Data publikacji:
    1993
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    sukcesja roslin
    warunki siedliskowe
    zmiany skladu gatunkowego
    drzewostany sosnowe
    sklad gatunkowy
    lasy
    Quercus
    ekologia lasu
    dab
    Jasien
    Lasy Rogowskie
    Źródło:
    Sylwan; 1993, 137, 09; 37-46
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ekologiczne konsekwencje hodowli drzew w różnym zagęszczeniu III. Stabilność drzewostanu, fitoklimat i różnorodność biologiczna
    Ecological consequences of silviculture at variable stand densities. III. Stand stability, phytoclimate and biodiversity
    Autorzy:
    Jagodziński, A.M.
    Oleksyn, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1011879.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    wiezba drzew
    zageszczenie poczatkowe
    drzewostany
    roznorodnosc biologiczna
    mikroklimat
    lesnictwo
    ekologia lasu
    stabilnosc drzewostanu
    zageszczenie roslin
    stand density
    spacing
    tree competition
    forest ecology
    stand stability
    microclimate
    biodiversity
    review
    Opis:
    The main goal of this review was to characterize ecological consequences of growing trees at variable stand densities. We analyzed the influence of stand density on its mechanical and biological stability, diversity and biomass of understory plants and microclimate conditions (e.g. temperature, humidity, light, etc.). Higher stand density results in higher susceptibility to wind and snow damage, due to changes in height to diameter ratio (tree slenderness). The mechanical stability of stands may be promoted by silvicultural activities such as light thinning applied before growth stagnation. In addition, the reduction of stand density during stand development may increase biomass allocation to coarse roots that stabilize trees in the soil. High tree density may increase stand susceptibility to pathogens and insects and thus increase tree mortality. Trees growing at higher density (with higher intraspecific competition) may allocate less assimilates for defense against herbivorous insects and pathogens. The effect of tree density on stability of multi−species stands is inconclusive, since such studies were only occasionally undertaken. Since tree density influences light conditions (mainly before canopy closure), there is a negative relationship between stand density and herbaceous species diversity and biomass. Based on the published data, we summarized consequences of silviculture at different stand densities and proposed future directions of research needed to fill the gaps in current knowledge. Understanding the long−term ecological consequences of variable stand densities is essential for development of sustainable and stable forest ecosystems.
    Źródło:
    Sylwan; 2009, 153, 04; 219-230
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przestrzenny rozkład opadu cetyny oraz przyrostu pierśnicy w drzewostanach sosnowych rosnących po likwidacji ogniska reprodukcji cetyńców Tomicus piniperda (L.) i T. minor (Hart.)
    Spatial pattern of insect−induced needle drop and dbh increment in pine stands before and after liquidation of sawmill and landing
    Autorzy:
    Borkowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1026407.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany sosnowe
    rozklad przestrzenny
    Tomicus minor
    Tomicus piniperda
    szkodniki roslin
    cetyniec mniejszy
    cetyniec wiekszy
    lesnictwo
    piersnice drzew
    ekologia lasu
    opad cetyny
    przyrost drzew
    ecology
    tomicus piniperda
    t. minor
    dbh increment
    Opis:
    The studies were conducted in the years 1992−1996 and 2001−2002 in the Węgle Forest Sub−district, Zagnańsk Forest District. The aim of the studies was to compare the spatial pattern of needle drop caused by Tomicus sp. and the dbh increment in pine stands before and after the liquidation of the sawmill and timber landing. Eight zones at different distances from the sawmill were distinguished: I – edge zone, II – 100 m, III – 300 m, IV – 500 m, V – 700 m, VI – 900 m, VII – 1100 m and VIII – 2000 m (control). The needle drops were collected from each zones using under−canopy plots of 4 m². in size and drilling into trees at the dbh using a Suunto increment borer. Research results confirmed the significant effect of the reproduction centres of Tomicus sp. on the losses in tree increments. The higher significant values of the needle drop during the functioning of the timber landing were related to the lower values of the dbh increment, and with the low needle drop following the liquidation of the landing the increment values were levelled in first zones.
    Źródło:
    Sylwan; 2003, 147, 06; 87-92
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ dębu czerwonego Quercus rubra L. na populacje paproci w różnych typach fitocenoz leśnych
    Impact of northern red oak Quercus rubra L. on ferns populations in different forest phytocoenoses
    Autorzy:
    Zarzycki, W.
    Wilczek, Z.
    Woźnica, P.
    Folcik, L.
    Lewandowska, A.
    Gancarek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/989730.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    ekologia lasu
    fitocenozy lesne
    las gradowy
    kwasna dabrowa
    buczyna
    drzewa lesne
    dab czerwony
    Quercus rubra
    allelopatia
    oddzialywanie na rosliny
    runo lesne
    paprocie
    wystepowanie
    populacje roslin
    competition
    interference
    allelopathy
    temperate forests
    biodiversity
    Opis:
    Northern red oak (Quercus rubra) is the most common alien tree species in Polish forests that is considered as an invasive one. It is native to North America. Negative impact of Q. rubra on natural habitats in Europe is well−known, but there is still a lack of information about correlations between red oak and individual species or groups of plants. Especially knowledge about impact of Q. rubra on fern communities is still unsatisfactory. The goal of research was to check if ferns could be neutral to the negative oak impact. In order to verify, populations of ferns occurring in patches of forests dominated by northern red oak and population from natural forests with the same abiotic conditions were compared. Moreover, quantitative relations between ferns and other herb species were analyzed. The research was carried out in southern Poland. Field surveys were conducted in 100 m² plots with domination of Q. rubra. Plots were settled in 3 different types of plant communities: mixed broadleaf forest, acidophilous oak forest and acidophilous beech forest. In the same types of plant communities, but without northern red oak, control plots were located. Control patch was settled in place with similar inclination, exposition, altitude and water regimes. For each surface list of all herb species with their percentage coverage and biometric measures of fern fronds were made. At maximum 50 specimens of each fern species were taken into account. Plots were located in areas of 3 geographical regions: the Śląskie Foothills, the Oświęcimska Basin and Śląska Upland. Results show that ferns in monocultures of the alien oak are bigger, more lush and their coverage is higher than in the control plots. What is more, coverage of other herb species and species diversity are significantly higher in control patches. It suggest that ferns are not sensitive to Q. rubra influence, so it can be concluded that they are competitive to other species which are sensitive to northern red oak impact.
    Źródło:
    Sylwan; 2015, 159, 08; 658-665
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ekologiczne konsekwencje hodowli drzew w różnym zagęszczeniu II. Produkcja i alokacja biomasy, retencja biogenów
    Ecological consequences of silviculture at variable stand densities. II. Biomass production and allocation, nutrient retention
    Autorzy:
    Jagodziński, A.M.
    Oleksyn, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1011811.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    wiezba drzew
    zageszczenie poczatkowe
    mikroelementy
    lesnictwo
    skladniki pokarmowe
    ekologia lasu
    makroelementy
    zageszczenie roslin
    dostepnosc skladnikow pokarmowych
    wymiana gazowa
    drzewostany
    biomasa
    alokacja biomasy
    stand density
    spacing
    tree competition
    forest ecology
    biomass allocation
    nutrient retention
    review
    Opis:
    The main goal of this review was to characterize ecological consequences of growing trees at variable stand densities. Increasing stand density results in rising competition among trees in their below− and above− ground parts, leads to changes in stand structure (DBH, height, crown width and length, crown ratio, tree slenderness, branch diameters and length) and thus modifies biomass partitioning and may influence stand productivity. Trees grown at higher density compete more intensely for limited resources such as space, light, water and nutrients, than in those grown at wider spacing. In general, total tree biomass accumulation is higher in more dense stands and in less dense stands a higher proportion of biomass is allocated to coarse roots. Moreover, stand density may alter foliage distribution within the crowns. For stands grown at higher tree density, leaf area index (LAI) may increase and thus influence stand productivity, however LAI is closely related to light requirements and succession status of the species. Because stand density may simultaneously modify macro− and micronutrient concentration in different tree tissues and biomass partitioning, it may lead to distinct changes in the nutrient balance of the forest ecosystem. For example, a considerable pool of stand mineral elements (including carbon) is allocated to roots that are not subjected to traditional stand management. Therefore, manipulation of stand density leading to higher biomass allocation to roots may increase carbon sequestration in forest ecosystems.
    Źródło:
    Sylwan; 2009, 153, 03; 147-157
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Do czego służą badania na stałych powierzchniach w Białowieskim Parku Narodowym?
    What is the use of studies carried out on the permanent plots in the Bialowieza National Park?
    Autorzy:
    Bobiec, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1294369.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    ekologia lasu
    Bialowieski Park Narodowy
    lasy
    stale powierzchnie obserwacyjne
    badania naukowe
    ekosystemy lesne
    dynamika ekosystemow
    sukcesja naturalna
    szkodniki roslin
    kornik drukarz
    gradacja
    ecological disturbances
    ecological history
    plots’ representativeness
    spatial scale
    spruce bark beetle outbreak
    stand
    dynamics
    Opis:
    The purpose of the strictly protected area of the Białowieża National Park (BNP) established in early 1900s, was to protect a compact block of the Białowieża forest from any direct human influence and activity. Its founders considered it a “laboratory of nature.” In 1936, five rectangular plots with a total area of ca. 15.5 ha (ca. 0.3% of the BNP) were set up for regular monitoring of stand development with regards to the initial state and variability of soil conditions. During the first 76 years of the project, a steady increase in the proportion of hornbeam and lime tree at the expense of shade-intolerant species was observed. This trend has been interpreted by the researchers involved in the monitoring of the permanent BNP plots to constitute a biodiversity-threatening development caused by preservation efforts. Such an interpretation has been widely incorporated in the public debate by political authorities and the forestry sector. In this critical article I challenge the major arguments presented by the key expert in silviculture, prof. B. Brzeziecki. My criticism is directed at the methodological approach as well as at the data interpretation.
    Źródło:
    Leśne Prace Badawcze; 2016, 77, 4
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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