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    Wyświetlanie 1-8 z 8
    Tytuł:
    Biomasa i roczna produkcja drzewostanów dębowych Puszczy Niepołomickiej
    Biomass and annual production of oak stands in the Niepolomicka Forest
    Autorzy:
    Orzeł, S.
    Ochał, W.
    Forgiel, M.
    Socha, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1018550.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany debowe
    Puszcza Niepolomicka
    lesnictwo
    biomasa
    produkcja biomasy
    oak stand
    biomass
    annual biomass production
    Opis:
    The paper presents the results of the study on biomass volume and annual production of oak stands in the Niepołomicka Forest. The analysis was based on the material collected from 59 circular sample plots where oak accounted for more than 50% of the volume of the tree layer. In the total biomass of the tree layer amounting to about 225.3 t·ha–1, the biomass of the shrub layer (underbrush) is about 2.3 t·ha–1. In the tree layer biomass (about 223 t·ha–1), wood makes up on average 86.4%, bark – 12% and assimilatory apparatus – 1.6%. The share of wood in the biomass increases with the increase of stand age, while that of bark and assimilatory apparatus declines. The proportion of these elements in the dry mass production (on average 9.8 t·ha–1·year–1) is somewhat different. Almost 35% of its volume is assimilatory apparatus whose share increases with stand age. The increment of bark is about 9%, while of wood it is 56% of the annual biomass production of the stands under analysis and slightly decreases with stand age.
    Źródło:
    Sylwan; 2006, 150, 05; 30-43
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kształtowanie się smukłości pni dębu szypułkowego (Quercus robur L.) w zależności od wieku drzew
    Forming slendernes of pedunculate oak stems [Quercus robur L.] in dependence of age of trees
    Autorzy:
    Kaźmierczak, K.
    Pazdrowski, W.
    Mańka, K.
    Szymański, M.
    Nawrot, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1012526.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    dendrometria
    smuklosc drzew
    wiek drzew
    Quercus robur
    lesnictwo
    dab szypulkowy
    drzewa lesne
    slenderness
    pedunculate oak
    stand stability
    age
    Opis:
    Paper identifies value and variability of slenderness of pedunculate oak stems in age range from 10 to 140 years describing slenderness of tree stems simultaneously using linear and multiplies regression. Strength of the connections between slenderness and selected dendrometrical traits was also defined. Dependence of the slenderness was investigated with respect to height, breast height diameter, and 10−years increment of breast height diameter, volume and 10−years volume increment in specific years of tree life. The slenderness of trees decreases with the growth of breast height diameter, breast height diameter increment, volume and volume increment. In case of height opposite tendency was observed. Dependence of slenderness on breast height diameter, height and age was analysed for all trees altogether as well. Slenderness was described additionally with linear and multivariate empirical equations.
    Źródło:
    Sylwan; 2008, 152, 07; 39-45
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Konsekwencje hodowlane obumierania dębów
    Sylvicultural consequences of oak decline
    Autorzy:
    Bernadzki, E.
    Grynkiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1018431.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany debowe
    hodowla lasu
    zamieranie lasow
    Quercus
    lesnictwo
    dab
    zamieranie drzew
    drzewa lesne
    oak decline
    stand conversion
    transitional communities
    Opis:
    The rate of oak decline has greatly accelerated in recent years. It has been reported that in October 2005, the amount of standing dead trees in oak stands of 14 Forest District Administrations situated within the Regional Directorate of State Forests in Warsaw exceeded 70,000 m3 and an area of 103 hectares was selected where sanitary fellings need to be applied. The restocking of cut areas in the thinned stands with substitutional species was proposed. Besides, the paper presents a conception of oak regeneration by planting trees in wider spacing, under the shelter of pioneer species (mainly birch), using the tending species (i. a. hornbeam).
    Źródło:
    Sylwan; 2006, 150, 08; 61-69
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rola sójki (Garrulus glandarius) w inicjowaniu przemian sukcesyjnych zbiorowisk leśnych z udziałem dębu (Quercus sp.)
    Role of jay (Garrulus glandarius) in initializing successional changes in forest communities with the participation of oak (Quercus sp.)
    Autorzy:
    Olszewski, A.
    Brzeziecki, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/980357.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    zbiorowiska lesne
    sukcesja roslin
    dab
    Quercus
    zoochoria
    sojka
    Garrulus glandarius
    acorn
    jay
    oak
    ornitochory
    seed dispersal
    stand heterogeneity
    tree succession
    zoochory
    Opis:
    The ability of spatial expansion and conquering of new locations, suitable for growth, is one of the most important properties enabling different plant species (including forest trees) a permanent existence in a constantly changing (in space and in time) environment. In the course of evolution, plants developed several adaptations and mechanisms enabling them to capture new localities appropriate for life. The key role in this process is played by so called propagules, i.e. differently built spores, seeds and fruits. The main sources of forces and major transportation vectors for propagules are such mechanisms as: power of gravity (barochory), wind (anemochory), water (hydrochory), animals (zoochory) and man (antropochory). Among them, in case of tree species producing large seeds, containing bulky amounts of food resources, the most important role is played by zoochory. The special variant of zoochory is ornitochory, i.e. dispersion of plant propagules by birds. One of the best known and documented examples of ornitochory is dispersal of oak acorns by jays (Garrulus glandarius). The contemporary research shows that during a vegetation period one single bird is able to deposit even several thousends of acorns within the area of 10 to 100 ha. The dispersal distance in case of acorns distributed by jays is variable and depends on several factors, first of all, climatic conditions and degree of environmental heterogeneity. On average, acorns are distributed within a distance of several hundred meters from seed trees; sometimes they are disseminated at a distance of several (4−8, maximum 20) kilometers. As a rule, only a part of deposited acorns is uncovered and consumed by birds, thus at least some of them can germinate and produce new oak seedlings. It was also recently demonstrated that jays preferably put down acorns under the stand canopies composed by tree species other than oak, for instance, under Scots pine trees. Under favourable conditions, this initiates natural successional processes and leads to a significant conversion of tree stand composition. Considering a large scale and commonness of this phenomenon, it deserves an interest and attention, not in the case of natural forests only, but in the case of managed forests as well, in which the quasi−natural, successional processes, initiated by jays, can considerably contribute to a greater compositional and structural diversity of tree stands.
    Źródło:
    Sylwan; 2019, 163, 06; 479-88
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przyrost miąższości drzewostanów mieszanych i litych: wyniki z wybranych stałych powierzchni badawczych w Europie Środkowej
    Volume growth of mixed-species versus pure stands: results from selected long-term experimental plots in Central Europe
    Autorzy:
    Bilak, K.
    Dudzińska, M.
    Pretzsch, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/989685.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany lite
    drzewostany mieszane
    drzewostany swierkowo-bukowe
    drzewostany debowo-bukowe
    stale powierzchnie obserwacyjne
    stopien zmieszania drzew
    przyrost miazszosci
    european beech
    norway spruce
    sessile and pedunculate oak
    mixed stand
    pure stand
    facilitation
    competition
    overyielding
    underyielding
    close−to−nature silviculture
    Opis:
    This paper addresses the question of whether or not and to which extent two common tree species mixtures (Norway spruce – European beech; sessile and pedunculate oak – European beech) vary in volume growth from their monocultures. To this end, the results from selected long−term experimental plots located in Germany, Poland and Switzerland, with many of them under survey since the 1890's, were employed. We found than on average both type of mixtures exceeded volume growth in pure stands by almost 30%. The analysis at the species level showed than only a Norway spruce response to mixture was neutral on average, while other tree species were benefitted by mixture. An empirical derived model for mixed stand of oak and European beech disclosed that the interaction can range from facilitation and overyielding on poor sites, through the neutral response under mesotrophic conditions, up to underyielding on fertile sites triggered by competition.
    Źródło:
    Sylwan; 2015, 159, 01; 22-35
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ zwiększania się wieku drzewostanu dwupiętrowego na zmienność sum powierzchni przekroju pierśnicowego i miąższości drzew na powierzchniach próbnych różnych wielkości
    Effect of ageing on the variation of basal area and volume sums on sample plots varying in size in a two-storey stand
    Autorzy:
    Turski, M.
    Andrzejewski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1022959.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    suma powierzchni przekroju piersnicowego
    dendrometria
    suma miazszosci drzew
    drzewostany dwupietrowe
    wiek drzewostanu
    lesnictwo
    powierzchnie probne
    zmiennosc
    sample plot
    basal area
    volume
    two−storey stand
    pine
    oak
    Opis:
    The paper provides an analysis of changes in coefficients of variation of basal area and merchantable volume sums on sample plots of various sizes 1, 2, 4, 10, 6, 25 and 50 ares in a two−storey stand (storey I – pine 195 years, storey II − oak 105 years) over the last decade. The authors established how many times the number of sample plots of a given size at a given age should be increased in relation to the last measurement to attain the same result accuracy. Moreover, the optimal size of small sample plots that can grant the most accurate results was calculated.
    Źródło:
    Sylwan; 2005, 149, 09; 15-23
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kryteria wieku dojrzałości drzewostanów do odnowienia
    The criteria of maturity age of a stand to regenerate
    Autorzy:
    Głaz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/973276.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    Pinus
    Abies
    Picea
    buk
    Quercus
    Fagus
    drzewostany
    sosna
    świerk
    jodła
    dąb
    drzewa leśne
    leśnictwo
    wiek dojrzałości od odnowienia
    stands with natural regeneration
    maturity age of a stand to regenerate
    pine
    spruce
    fir
    beech
    oak
    Opis:
    Stand characteristics were analysed for the occurrence of regrowth with a species matching the dominant species of a stand. The analysis covered: stand age, stocking, degree of shelter (the sum of stocking plus the percentage of the shrub layer cover), dbh basal area, type and the dominant species of the vegetation cover. The obtained results were considered as preliminary criteria of the maturity age for regeneration.
    Źródło:
    Sylwan; 2003, 147, 04; 69-70
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sukcesja dębu w drzewostanach sosnowych na siedliskach borowych
    The oak succession in the pine stand in the coniferous forest habitat
    Autorzy:
    Gniot, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1016532.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    sukcesja roslin
    drzewostany sosnowe
    siedliska borowe
    Quercus
    lesnictwo
    dab
    drzewa lesne
    natural succesion
    oak
    pure pine stand
    coniferous forest habitats
    silviculture
    transformation of the
    stand
    the complexity in the forest vegetation community
    the biological diversity in the forest
    forestry
    headquater
    balanced proecological forest management unit
    the function of the forest
    multipurpose
    forest
    the ecosystem of the forest
    stand varied in species
    biocenosis
    the natural upgrowth
    Opis:
    Permanently balanced forest economy demands today a resignation from a constant model of the forest stand, which preferred the productive function of the forest, mostly without any consideration to its natural values formed by Mother Nature. Implanting on Polish grounds principles of multifunctional forest districts acknowledged as a breeding object of the whole forest ecosystem, giving in that way the forest economy a proecological dimension. Its a result from a general progress of civilization and achievements in forest science; reaching towards the needs and expectations from the society gaining a general acceptation from different environments. One of the fundamental elements implementing the ecosystem is to rebuild deformed and artificially barred forest phytocenosis. This refers especially to pure pine stands on habitats, in which trophoism potential explains breeding habitats species variety. A good help for the forester in this area can be a natural succesion of good, noble broad−leaved species like for example the oak. Succesion of this species takes on a special meaning in poor habitats, in which it without any special imposes enriches the biocenose with the whole positive outcome accompanying this process; it can also be a valuable clue to the potential fertility in the habitat and the complexity in the forest vegetation community. An important task is to lead the way for the oaks development from succesion to its fullest use as a natural presence in creating the future forest generation. The article below is devoted to this question describing the natural up growth of the oak in pine stands on the coniferous forest habitats in Forest District Różanna and the methods and results in which they are used for breeding.
    Źródło:
    Sylwan; 2007, 151, 05; 60-72
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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