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    Wyświetlanie 1-8 z 8
    Tytuł:
    Naturalne zmiany skladu gatunkowego i struktury piersnic drzewostanu na siedlisku olsu jesionowego w okresie 47 lat. Sukcesja czy regeneracja
    Autorzy:
    Brzezicki, B.
    Zybura, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/816931.pdf
    Data publikacji:
    1998
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    zmiany skladu gatunkowego
    siedlisko olsu jesionowego
    zmiany struktury piersnic
    piersnicowe pole przekroju
    powierzchnie badawcze
    Nadlesnictwo Bialowieza
    lesnictwo
    Źródło:
    Sylwan; 1998, 142, 04; 19-31
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza zależności struktury lasu od wieku na przykładzie drzewostanów sosnowych
    Analysis of forest structure in relation to age – Scots pine case study
    Autorzy:
    Sławski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/973837.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany sosnowe
    starodrzew
    struktura drzewostanu
    wiek drzewostanu
    zmiany struktury drzewostanu
    leśnictwo
    forest structure
    old−growth
    pine forest
    Opis:
    Structure of pine forests develops with age and becomes more complex in older stands. Key attributes of old−growth forest structure include presence of huge trees, coarse woody debris, hollow trees, trees with fungi, clearings, two or more layered structure. In total, 26 attributes show positive correlation with age. This set can be used as base for old−growthness index. Cluster analysis divided forest stands into four groups with different level of maturity. Stands older than 160 years occurred fully developed. It seams that in sustainable forestry attributes of old−growth forests can be maintained as key elements for biodiversity.
    Źródło:
    Sylwan; 2011, 155, 01; 10-20
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ stosowanych zabiegów pielęgnacyjnych i rębni na zmianę struktury genetycznej drzewostanów
    The effect of tending treatments and cutting systems on the genetic structure of stands
    Autorzy:
    Sabor, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1026480.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    oddzialywanie na las
    drzewostany
    rebnie
    selekcja naturalna
    lesnictwo
    zmiany struktury genetycznej
    zabiegi pielegnacyjne
    genetic variability
    silvicultural treatments
    natural selection
    heterozygousness
    mating
    forest sustainability
    Opis:
    Modern forestry puts effect to ensure the genetic and ecosystemic variability. The paper points to the role of natural selection and maintenance of forest sustainability and provides the characteristic of stands as genetic population and the description of mating systems and their impact on the heterozygous level in trees, as well as of the mechanism of the gene transfer. This is the background to determine genetic effects of the selection and tending treatment such as grading of seeds and seedlings, early and late cleaning, thinning and final felling on forest cultivation.
    Źródło:
    Sylwan; 2003, 147, 02; 39-48
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmiany struktury genetycznej pomiędzy populacją rodzicielską a potomną w drzewostanie nasiennym sosny zwyczajnej (Pinus sylvestris L.)
    Changes of genetic structure between parental and offspring populations in a seed stand of Scots pine [Pinus sylvestris L.]
    Autorzy:
    Dzialuk, A.
    Burczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1018561.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany nasienne
    sosna zwyczajna
    lesnictwo
    zmiany struktury genetycznej
    populacje rodzicielskie
    populacje potomne
    Pinus sylvestris
    drzewa lesne
    genetic diversity
    genetic erosion
    seed tree stand
    scots pine
    Opis:
    Eight isozyme gene loci were used to compare genetic structure and variation of parental and offspring populations of Scots pine (Pinus sylvestris L.) in the seed tree stand located in the Woziwoda Forest District of the Tuchola Forest. Although, the estimated parameters indicate small reduction of heterozygosity in offspring populations, the stand may be considered as a valuable seed source for reforestation.
    Źródło:
    Sylwan; 2006, 150, 10; 30-38
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przemiana sposobu zagospodarowania lasu na przerębowy na przykładzie jednostki kontrolnej Chełmsko w Nadleśnictwie Kamienna Góra
    Conversion to selection type of silvicultural system on the example of Chelmsko control unit in the Kamienna Gora Forest District
    Autorzy:
    Barzdajn, W.
    Kowalkowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/989578.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Sudety
    jodla pospolita
    restytucja gatunku
    drzewostany swierkowe
    przebudowa drzewostanow
    ciecia przerebowe
    powierzchnie probne
    zmiany skladu gatunkowego
    zmiany struktury drzewostanu
    Nadlesnictwo Kamienna Gora
    abies alba
    selection silvicultural system
    the sudety mts.
    Opis:
    The study assesses the effect of applied cuttings on the transformation of the species composition, structure and development of the forest towards selection forest type. The described control unit was established in 2000 in the Krucze Mts. (southern Poland) within the programme of silver fir restoration in the Sudety Mts. The working hypothesis was based on the advantageous effect of the selection management system on fir trees. 46 permanent circular sample plots of 0.05 ha each were established and diameter at breast height measured on all trees along with height of 2−3 trees growing closest to the plot center. Measurements were repeated in 2004 and 2013. The greatest share in the growth increment was recorded for the most numerous species (spruce and fir). Only spruce and beech were important in the group of young trees (recruitment), which did not include fir or larch. The timber resources increased from 339 in 2000 to 381 m³/ha in 2013, which indicates that not whole current increment was harvested. The increase in the growing stock follows the reduction in the number of trees per hectare from 361 to 317. Thus the number of young trees did not compensate for the losses. As a result the investigated unit is not in the state of equilibrium and in the future more work and care should be devoted to the regeneration. Fir turned out to be a species with the greatest production potential. In the first period growing stock of this species amounted to 17%, while the increment was over 26%. In the latter the increment reached 34%. The most important objective of the selection cuttings in this concrete unit should be to tend for regeneration and trees at low diameter sub−classes at the expense of use of trees with target values of diameters at breast height and disturbing the selection cutting structure. It is advisable to increase the share of fir in the structure of analysed unit.
    Źródło:
    Sylwan; 2016, 160, 05; 388-396
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmiany górnoreglowego drzewostanu świerkowego w Tatrzańskim Parku Narodowym w latach 1973?2002
    Changes of a subalpine spruce forest in the Tatra National Park in 1973-2002
    Autorzy:
    Holeksa, J.
    Krawczyk, B.
    Skawiński, P.
    Wesołowska, M.
    Wika, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1015805.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    Tatrzanski Park Narodowy
    miazszosc drzewostanow
    zmiany struktury drzewostanu
    drzewostany swierkowe
    zageszczenie
    struktura grubosci
    regiel gorny
    parki narodowe
    lesnictwo
    struktura drzewostanu
    zamieranie drzew
    plagiothecio−piceetum
    stand structure
    volume
    equilibrium
    Opis:
    The paper presents nearly 30−year changes in the structure of a 160 ha subalpine spruce stand in the Tatra National Park that has been subjected to strict protection during last 50 years. In 1973 a regular network of 65 small 0.05 ha circular plots was established over the whole area. In 2002 diameter and height of trees were remeasured in 61 plots. Similar changes were recorded nearly in the whole forest area. The density of trees decreased and the stand volume increased considerably on most plots. At the same time the variability among plots in trees' number and volume decreased and in 2002 the stand became more homogenous in terms of both characteristics. The obtained results were compared to the suggestion of Korpeľ that subalpine spruce stands reach the equilibrium between decay and growth processes on the area of 70 ha. The investigated forest was far from such equilibrium in spite of its area being more than two times bigger than that suggested by Korpeľ.
    Źródło:
    Sylwan; 2007, 151, 09; 29-40
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena introdukcji Carya ovata (Mill.) K. Koch na siedlisku grądu w Nadleśnictwie Czerniejewo
    Assessment of Carya ovata (Mill.) K.Koch introduction to the potential oak-hornbeam forest habitat in the Czerniejewo Forest District
    Autorzy:
    Paź, S.
    Czapiewska, N.
    Dyderski, M.K.
    Jagodziński, A.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/985838.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    ekosystemy lesne
    rosliny
    gatunki obce
    introdukcja
    orzesznik pieciolistkowy
    Carya ovata
    zmiany struktury drzewostanu
    siedliska gradowe
    Nadlesnictwo Czerniejewo
    vegetation
    species richness
    light availability
    tree stand structure
    galio−carpinetum
    Opis:
    Alien tree species, due to their longevity, manifest their invasive potential after several decades from introduction. For the high threat to biodiversity, there is a need to analyze the risk of introduction connected with numerous alien tree species introduced in the various forest ecosystems. We aimed to assess the productivity potential and effect of alien Carya ovata on understory vegetation. Our study was conducted in the oldest (122 years old) tree stand of C. ovata in Poland, located in the Czerniejewo Forest District (western Poland). We analyzed C. ovata tree stand features and vegetation traits within the forest community and compared with natural vegetation – oak−hornbeam forest. We found that C. ovata trees had lower dimensions and standing volume than oaks (Quercus robur and Q. petraea) growing in the neighborhood. We also did not find the impact of C. ovata stands on understory vegetation species composition and light availability. Because of the low impact on forest floor vegetation and lack of spread we concluded that C. ovata cannot be classified as an invasive species. Moreover, its introduction was not successful in terms of tree stand productivity.
    Źródło:
    Sylwan; 2018, 162, 01; 41-48
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wieloletnie zmiany składu gatunkowego drzewostanów o podwyższonym reżimie ochronnym w Puszczy Augustowskiej i Puszczy Knyszyńskiej
    Long-term changes of tree species composition in high protective regime stands in the Augustow and Knyszyn Forests
    Autorzy:
    Paluch, R.
    Gabrysiak, K.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/979555.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Puszcza Augustowska
    Puszcza Knyszynska
    rezerwaty przyrody
    drzewostany naturalne
    zbiorowiska lesne
    sklad gatunkowy
    bor brusznicowy
    bor mieszany trzcinnikowo-swierkowy
    grad miodownikowo-grabowy
    odnowienia naturalne
    zmiany skladu gatunkowego
    zmiany struktury drzewostanu
    natural regeneration
    forest reserve
    natural stand
    hornbeam expansion
    Opis:
    In the last decades, we observed significant changes in the tree species composition in all layers of close−to−natural stands. Since the 1970s, the Forest Research Institute has collected and stored dataset from stand measurements, phytosociological and other research that are the basis for the long−term monitoring of vegetation. The aim of the research was to determine the directions of changes in the species composition and structure of tree stands, and to analyze the changes in the species composition of natural regeneration growing without human interference in various forest communities in the period of about 40 years. From 2014 to 2017, 40 permanent plots of 0.25 ha were re−measured in the nature reserves of the Knyszyn and Augustów Forests (NE Poland). The diameter of all trees was measured and the trees of the natural regeneration and bushes up to 1.3 m high were counted. The stand similarity index (S) between successive measurements was calculated. The analysis of differences in the composition of tree stands in subsequent measurements was carried out using Student t and Kruskal−Wallis tests. In the species composition of fresh coniferous forest stands and fresh mixed coniferous forest, there were significant changes in the number and share of Scots pine and Norway spruce. In the Knyszyn Forest a significant decrease in the share of spruce was observed. However, an increase in the share of deciduous species was remarkable. An inhibition of the natural pine renewal process and increase in density of spruce regeneration was observed. It is necessary to emphasize the significant expansion of hornbeam in a fresh mixed deciduous forest in the Knyszyn Forest and expansion of hazel in the Augustów Forest. Mean basal area in the forest stands has increased. The similarity index between the beginning and the end of the research reached the value of 0.73−0.94. The species composition and density of natural regenerations created without human intervention are not satisfactory from the point of view of forest sustainability. The most important factor affecting the direction and rate of changes in the species composition of tree stands is the expansion of hornbeam and/or hazel. These species cause changes in the ecological conditions of the lowest forest layers, leading to the unification of the species composition of forest communities.
    Źródło:
    Sylwan; 2019, 163, 10; 846-854
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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