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    Wyświetlanie 1-3 z 3
    Tytuł:
    Określanie wieku młodych brzóz Betula pendula Roth rosnących na gruntach porolnych
    Determining the age of young silver birch (Betula pendula Roth) trees growing on former agricultural
    Autorzy:
    Tkaczyk, M.
    Tomusiak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1318016.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    grunty porolne
    drzewa
    brzoza brodawkowata
    Betula pendula
    drzewa mlode
    wiek drzew
    okreslanie wieku
    piersnice drzew
    wysokosc drzew
    silver birch
    age
    dbh
    height
    former agricultural land
    Opis:
    In Poland, according to the law (amendment of the act of 21st May 2010) – on the provision of information on the environment and its protection, public participation in environmental protection and environmental impact assessments etc. (Official Law Journal article 08.199.1227, as amended) – the owner can cut down trees without permission, if they do not exceed the age of 10 years old. However, if an owner happens to cuts down a tree on his property without knowing the age of the tree, he is liable to prosecution under this act. The aim of this study is to verify whether there is a possibility to calculate the actual age of silver birch trees growing on former agricultural lands using features that enable age of standing trees to be identified. Using these criteria, owners would be able to calculate the age of trees on their own. The research used 183 sample trees located on three research plots. For each tree, the dbh, height and prepared samples of wood from the trees base were used to give the age of the tree. The relationship between age and dbh, as well as between the age and the height was examined. The strength of correlation was compared and the strongest was used in the proposed model. Using these correlations two types of charts were constructed to estimate the age of young birches on the basis of dbh and height.
    Źródło:
    Leśne Prace Badawcze; 2013, 74, 4; 357-363
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zróżnicowanie bieżącego przyrostu sosen w trzech klasach wieku
    The current growth increment of pine tree stands comprising three different age classes
    Autorzy:
    Kaźmierczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1339817.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    dendrometria
    drzewa lesne
    klasy wieku
    klasy Krafta
    drzewostany I klasy wieku
    drzewostany II klasy wieku
    drzewostany III klasy wieku
    sosna zwyczajna
    Pinus sylvestris
    przyrost drzew
    przyrost biezacy
    przyrost wysokosci
    przyrost piersnicy
    przyrost piersnicowego pola przekroju
    przyrost miazszosci
    height increment
    dbh increment
    basal area increment
    volume increment
    growth space
    crown
    age
    biosocial position
    Opis:
    The study presents the results of an analysis of the pine tree growth increments (height increment, dbh increment, basal area increment and volume increment) for a 5-year period. The study involved Scots pine trees of Kraft's class 1, 2 and 3 (dominant stand) in stands of different age classes (II, III, V) growing in fresh mixed coniferous (BMoew) and fresh coniferous (Boew) forest habitats. The multivariate analysis of variance was performed to assess the statistical significance of age and dominance of trees within a stand on their increment. The dominance position was classified for each tree using Kraft's criteria. The following characteristics were also measured: dbh of the trunk in two directions (N-S and W-E), and crown projection area on the basis of the characteristic tree crown points, projected using of a crown projector, characteristic points in tree crowns (7 to 14 on average). The actual height was determined after trees were felled. The following measurements of the single tree growing space were selected and determined: crown projection area – pk (m2), crown diameter – dk (m), Seebach's growth space number – dk / d1. 3 , crown projection area to basal area ratio –d d k 2 1 3 / 2. , crown deflection coefficient –d h k / , single tree space ppd=pk·h (m3). We assessed the strength of the relationships between tree growth parameters and tree growth space, crown length, relative crown length and slenderness. Both the age and dominance position of trees within the stand affected the growth increments. The strongest correlation among measured traits was between the 5-year volume increment and decreasing slenderness.
    Źródło:
    Leśne Prace Badawcze; 2013, 74, 2; 93-100
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stan wielogatunkowego lasu naturalnego (Abies, Fagus, Picea) regla dolnego w rezerwacie Oszast na tle monokultur świerkowych w Beskidzie Żywieckim i Beskidzie Śląskim
    A comparison of lower montane natural forest (Abies, Fagus, Picea) in Oszast Reserve and spruce monocultures in the Zywiecki Beskid and Slaski Beskid
    Autorzy:
    Jaworski, A.
    Pach, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1316186.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    lasy gorskie
    regiel dolny
    rezerwaty przyrody
    rezerwat Oszast
    las naturalny
    drzewostany wielogatunkowe
    sklad gatunkowy
    swierk pospolity
    Picea abies
    buk zwyczajny
    Fagus sylvatica
    jodla pospolita
    Abies alba
    klon jawor
    Acer pseudoplatanus
    jarzab pospolity
    Sorbus aucuparia
    zmiany skladu gatunkowego
    zasobnosc drzewostanu
    struktura drzewostanu
    rozklad piersnic
    smiertelnosc
    odnowienia lasu
    stand volume
    dbh distribution
    mortality
    regeneration
    Opis:
    The aim of this research was to find out what changes occurred between 1999-2009 in Oszast reserve in the volume, species composition and diameter at breast height (dbh) distribution of the forest stand, and the number and height of regeneration. The objective was to determine what would be condition of these managed lower montane multispecies forest stands (Swiss irregular shelterwood method or selection cuttings) and what role spruce would play in them if they have not been replaced by spruce monocultures. The research was conducted on three permanent circular sample plots (s.p.), each had size of 1/3 ha. Over 10 years, standing volume of the forest stand increased on s.p. 1 (from around 562 m3 ha-1 to 649 m3 ha-1) and s.p. 3. (from 653 m3 ha-1 to 660 m3 ha-1), while decreased on s.p. 2. (from 421 m3 ha-1 to 378 m3 ha-1). The species composition, defined on the basis of volume share (averaged for the three s.p. jointly), did not undergo consistent changes. However, the relative dominance of beech over spruce was determined based on tree numbers. The average spruce mortality (averaged from three s.p.) did not exceed 10% and was slightly higher than that of beech (6%), and lower than fir mortality (15%). Nevertheless, spruce did not show any symptoms of dieback. The reasons behind its mortality were fallen trees and windbreaks. In regeneration, on the whole, beech or sycamore predominated, and the proportion of spruce and fir was small. In the future spruce and fir may even decrease further by competitive ability of dynamically regenerating beech. Abandonment of forest management to promote greater diversity of species, may favour the formation of beech monocultures, or forest stands dominated by beech, everywhere that beech is already present or will be introduced. The maintenance of stable, multispecies forest stands, with co-dominant fir, beech and spruce of native origin, requires natural or artificial regeneration of spruce and fir, manipulated to restore fir up to about 30%, and reduce spruce down to about 40%. This would be possible through the use of the Swiss irregular shelterwood method and selection system, and by continuous tending of regeneration.
    Źródło:
    Leśne Prace Badawcze; 2014, 75, 1; 13-23
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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