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    Wyświetlanie 1-4 z 4
    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:
    Czy naturalne procesy ekologiczne w juwenilnej fazie rozwoju drzewostanu założonego sztucznie różnicują jego strukturę przestrzenną?
    Do natural processes at the juvenile stage of stand development differentiate the spatial structure of trees in artificially established forest stands?
    Autorzy:
    Szmyt, J.
    Korzeniewicz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1317220.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    ekologia lasu
    drzewostany sosnowe
    drzewostany debowe
    wiezba poczatkowa
    procesy ekologiczne
    wydzielanie sie drzew
    drzewa lesne
    sosna
    dab
    rozmieszczenie drzew w przestrzeni
    piersnice drzew
    wysokosc drzew
    dlugosc korony
    spatial indices
    forest diversity
    self-thinning
    managed forests
    Opis:
    Structural diversity is one of the most interesting phenomena that have been studied by forest ecologists and practitioners. Amongst the different characteristics of forest structure, spatial diversity of trees and their attributes seem to be very important. The more spatially structured a population is, the higher its diversity in terms of size and species richness. Because most forests in Europe are managed and were artificially established, they are subjected to conversion processes turning them into more complex systems. The approach presented here aims at elucidating whether natural processes, such as self-thinning, can cause the self-differentiation of spatial structure in artificially planted stands. Our analyses focused on untended Scots pine and pedunculate oak stands in the juvenile phase of development and were based on spatially explicit structural indices for positioning and size differentiation (diameter, total height and crown length). The obtained results indicate that live trees were dispersed more or less regularly. Unlike the anglebased index, which mostly indicated randomness in tree location, a distance-based index showed clear regularity. We also found that the distribution of tree attributes auto-correlates to tree location as indicated by significantly lower index values compared to values resulting from random reassignment of the examined attributes. This low degree of spatial differentiation is further confirmed by the distribution of indices in differentiation classes. Our results allow us to conclude that, in the case of light demanding species (pine and oak), natural processes do not increase spatial diversity of the stand, although, both species showed a certain degree of deviation in this respect.
    Źródło:
    Leśne Prace Badawcze; 2014, 75, 2; 171-179
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wyniki 18-letniego doświadczenia proweniencyjnego z bukiem zwyczajnym (Fagus sylvatica L.) w Nadleśnictwie Łobez
    The results of an 18-year old beech trees (Fagus sylvatica L.) provenance trial in the Lobez Forest District
    Autorzy:
    Kowalkowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1318522.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    hodowla lasu
    drzewa lesne
    buk zwyczajny
    Fagus sylvatica
    proweniencje
    przezywalnosc
    wysokosc drzew
    piersnice drzew
    suma powierzchni przekroju piersnicowego
    miazszosc drzew
    doswiadczenia proweniencyjne
    Nadlesnictwo Lobez
    Fagus sylvatica L.
    provenance variability
    valuation features
    Opis:
    The experimental area is located in the Wêgorzyno Forest Sub-District, £obez Forest District. 29 Polish provenances of beech from their natural range were growth in a completely randomized block design with four replications. In 2010, after the end of the growing season, measurements were carried out on the experimental plot, including: determination of the survival rate and the diameter at breast height, and height of trees. Moreover, the total basal area and the total volume were calculated. Using ANOVA, statistically significant differences between provenances were apparent for four of the five traits measured; all except diameter at breast height. Provenances characterized by high values for the analyzed traits were considered the best adapted to the habitat conditions in the experimental plot, while provenances reaching low values were considered unsuitable for use under the conditions similar to those at the trial site location.
    Źródło:
    Leśne Prace Badawcze; 2013, 74, 3; 197-203
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Związki między wybranymi cechami drzewa a niektórymi właściwościami drewna młodocianego sosny zwyczajnej (Pinus sylvestris L.)
    Relationships between selected tree characteristics and the properties of juvenile wood in Scots pine (Pinus sylvestris L.)
    Autorzy:
    Tomczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1312952.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    drzewa lesne
    sosna zwyczajna
    Pinus sylvestris
    cechy morfologiczne
    wysokosc drzew
    piersnice drzew
    wysokosc osadzenia pierwszej zywej galezi
    srednica korony
    dlugosc korony
    drewno sosnowe
    drewno mlodociane
    gestosc drewna
    gestosc umowna
    wytrzymalosc na sciskanie wzdluz wlokien
    wytrzymalosc na zginanie statyczne
    modul elastycznosci przy zginaniu
    korelacja cech
    basic density
    strength perpendicular to grain
    bending strength
    modulus of elasticity
    breast height
    diameter
    tree height
    crown length
    crown diameter
    Opis:
    The aim of this study was to determine relationships between selected properties of juvenile wood and characteristics of the stem and crown of Scots pine. Analyses were conducted in northern Poland in eight mature pine monocultures. Nine trees were selected in each experimental site and their stems were divided into five sections. The centers of the sections were established at a height of 1.3 m from the tree base and at points corresponding to 20, 40, 60 and 80% tree height. Samples were taken from these locations, and these samples were prepared for analyses of basic density, compressive strength along the grain and static bending, as well as the modulus of elasticity during bending. The mean height of the investigated group of trees was 26.0 m with an average diameter breast high of 33.6 cm. The mean crown depth was 7.8 m and crown diameter was 3.6 m, and the mean basic density (Qu) of juvenile pine wood was 416 kg/m3. The average compressive strength along the grain (CS) was determined to be 22.3 MPa, while static bending strength (BS) was 45.8 MPa. The recorded modulus of elasticity (MOE) was 4726 MPa. Both in general terms and when dividing stems into sections, the wood properties correlated with tree characteristics to various degrees. All indexes were negative indicating that trees of greater dimensions produce juvenile wood of inferior quality. Properties of juvenile wood formed during various periods of tree life were mostly related to diameter breast high and crown depth. They were also correlated with tree height, but only to a limited extent. In contrast, properties of wood from the middle stem sections were significantly correlated with crown diameter.
    Źródło:
    Leśne Prace Badawcze; 2014, 75, 3; 237-244
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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