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    Wyświetlanie 1-4 z 4
    Tytuł:
    Cechy biometryczne podrostów dębowych pochodzenia naturalnego rosnących pod osłoną drzewostanów sosnowych
    Biometric features of oak advance-growth growing under Scots pine canopy
    Autorzy:
    Żybura, H.
    Pewniak, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/989077.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    hodowla lasu
    drzewostany sosnowe
    sosna zwyczajna
    Pinus sylvestris
    siedlisko boru mieszanego swiezego
    siedlisko lasu mieszanego swiezego
    podrost
    dab
    Quercus
    cechy biometryczne
    odnowienia podokapowe
    scots pine
    oak
    biometric features
    canopy
    Opis:
    The objectives of the study was to investigate and compare the characteristics of oak advance−growth of various age present under Scots pine canopy and growing on the mesic mixed coniferous (BMśw) or mesic mixed deciduous (LMśw) forest site types. The study was conducted in Kolumna Forest District (central Poland) in 21 Scots pine stands ca. 90 years of age, and with a well−developed oak advance−growth. The study sites were divided into 4 groups depending on the age of oak: 15, 20, 25 or 30−years−old. The empirical data concerned trees frequency (per unit area), average breast height diameter, height and basal area. The dependence of these characteristics on type of the main stand and advance−growth was then determined by statistical analysis. Above all, an attempt was made to determine the impact of forest site type conditions on the characteristics of oaks advance−growth. Results show that oaks are present at the density that makes the possibility of the advance−growth development into the stand real. Trees in the upper storey are found to exert a great influence on the silvicultural value of advance−growth trees. In particular, the density of trees in the main stand is a feature found to affect greatly the layer of oak advance−growth.
    Źródło:
    Sylwan; 2017, 161, 06; 476-484
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ warunków siedliskowych, wielkości gniazda oraz położenia w jego obrębie na wysokość 6- i 10-letnich dębów szypułkowych (Quercus robur L.)
    The influence of site conditions, opening size and location within a gap on height of 6- and 10-year-old pedunculate oaks (Quercus robur L.)
    Autorzy:
    Bolibok, L.
    Szeligowski, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/974048.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    Quercus
    odnowienia lasu
    siedlisko boru mieszanego swiezego
    siedlisko lasu mieszanego swiezego
    warunki siedliskowe
    dąb
    leśnictwo
    rębnie zupełne gniazdowe
    wielkość gniazd
    wzrost roślin
    patch cutting
    artificial gap
    pedunculate oak
    gap size
    site type
    spatial height variability
    Opis:
    The influence of artificial elliptical gaps (size 15 and 20 are) on height of young (6 and 10 year old) planted pedunculate oaks was investigated on fresh mixed−coniferous and fresh mixed−broadleaved forest site types. For each combination of age, site type and gap size four gaps were sampled. In each gap, 3 circular sampling plots of 3 m radius were placed in northern, central and southern part of gap. The analysis were carried out separately for 6− and 10−year−old oaks and proved that gap size did not have an influence on height of younger and older oaks. In both cases, site type influence had statistical importance, but the practical silvicultural importance of this difference was only for older oaks. The position within gap was not important for growth of younger oaks, but had an influence on the height of older ones in different manner in different site conditions. The mean height of older oaks growing in more fertile conditions had maximum value in the centre of artificial gaps and diminished towards the periphery. On less fertile site types older oaks were the lowest in the northern position and their height in southern and central part of gaps was comparable.
    Źródło:
    Sylwan; 2011, 155, 02; 84-95
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ masowego zamierania świerka w drzewostanach Białowieskiego Parku Narodowego na odnowienie naturalne dębu
    Influence of spruce decline in stands of the Bialowieza National Park on natural oak regeneration
    Autorzy:
    Bobiec, A.
    Bobiec, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1007250.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Bialowieski Park Narodowy
    siedlisko boru mieszanego swiezego
    siedlisko lasu mieszanego swiezego
    powierzchnie badawcze
    drzewostany swierkowe
    dynamika drzewostanu
    swierk pospolity
    Picea abies
    zamieranie drzew
    dab
    Quercus
    struktura grubosci
    odnowienia naturalne
    podrost
    diameter structure
    disturbances
    ground fires
    regeneration wave
    stand decline
    Opis:
    The study aimed at analyzing the oak population structure was performed on the 29−hectare plot representing stands dominated by spruce in the strict reserve of the Białowieża National Park. It revealed that oaks represent two distinct cohorts: the old, emerged in the late 1800s, and the new that is being established in the area subject to mass decline of spruce. We suggest that the first regeneration wave was the result of ceasing the frequent ground fire regime that prevented the regeneration of trees except for pine. The current wave has been prompted by a set of changes in the habitat quality, following the breakdown of dense spruce−dominated stands. These changes, such as access to sunlight, accelerated decomposition of spruce litter, local exposure of mineral soil, and protective structures of lying spruce logs, provide regeneration advantage to oak and other intolerant species.
    Źródło:
    Sylwan; 2012, 156, 04; 243-251
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cechy jakościowe podrostów dębowych rosnących pod osłoną drzewostanów sosnowych
    Quality traits of undergrowth oaks beneath the canopy of Scots pine stands
    Autorzy:
    Aleksandrowicz-Trzcińska, M.
    Pewniak, B.
    Żybura, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/985772.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    hodowla lasu
    drzewostany sosnowe
    siedlisko boru mieszanego
    siedlisko lasu mieszanego swiezego
    podrost
    dab
    Quercus
    cechy jakosciowe
    odnowienia podokapowe
    trunk quality
    crown quality
    vitality
    development trend
    trees with future potential
    Opis:
    Scots pine stands in central Poland are now seen to be experiencing dynamic development of lower layers formed by oaks. The under−canopy natural renewal taking place in this way is sometimes characterised by good silvicultural quality, and could therefore be taken advantage of in the process of stand conversion. The study assess the quality of existing undergrowth layers of oak present in older stands of Scots pine, most especially from the point of view of their suitability for subjection to further silvicultural measures. The research material was collected in 10 objects where site type was classified as mesic mixed coniferous site type (BMśw) as well as in 11 ones with mesic mixed broadleaved forest (LMśw) site type. In each site type, 2 or 3 stands were selected to typify undergrowth layers aged 15, 20, 25 or 30 years. Assessment of oak undergrowth trees was made on the basis of 4−point scale in case of trunk or crown quality and vitality, and on a 3−point scale when vitality and the development trend were concerned. Next we selected the trees with future potential characterised by the highest quality from the point of view of all studied traits. A further determination concerned the influence on the traits in these best trees of the oak understorey that was exerted by biometric features of both the sheltering Scots pine stand and the under−growth itself. The studied undergrowth oaks are of either very good or good quality. Around 90% of these young trees could be assigned to 1st or 2nd quality class with the respect of all of analysed traits. Furthermore, fertility of the site type was found not to have any influence on the quality of the young oaks. However, where the number of trees identified as having future potential is concerned, influence was demonstrated for density of trees in both stand and the undergrowth layer, as well as their height, breast−height diameter and basal area. Oaks forming the lower layer beneath Scots pine stands are thus characterised by good quality and growth trends, to the extent that this suggests allowing further growth to take place, with inclusion within the main stand or next generation.
    Źródło:
    Sylwan; 2018, 162, 04; 267-276
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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