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    Wyświetlanie 1-5 z 5
    Tytuł:
    Współczynniki przeliczeniowe suchej biomasy drzew i ich części dla sosny pospolitej (Pinus sylvestris L.) w zachodniej Polsce
    Trees and their components biomass expansion factors for Scots pine (Pinus sylvestris L.) of western Poland
    Autorzy:
    Wojtan, R.
    Tomusiak, R.
    Zasada, M.
    Dudek, A.
    Michalak, K.
    Wróblewski, L.
    Bijak, S.
    Bronisz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/973910.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    biomass expansion factors
    Polska
    Lubuskie forest
    Scots pine
    lesnictwo
    dendrometria
    drzewa lesne
    sosna zwyczajna
    Pinus sylvestris
    biomasa sucha
    wspolczynniki przeliczeniowe
    Opis:
    Paper presents trees and their components biomass expansion factors for Scots pine growing in the Lubuskie Forest (western Poland). Elaborated formulae enable to determine aboveground biomass of Scots pine trees and stands basing on stem or merchantable wood volume.
    Źródło:
    Sylwan; 2011, 155, 04; 236-243
    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
    Tytuł:
    Tempo i kierunki zmian składu gatunkowego drzewostanów naturalnych w wybranych zbiorowiskach leśnych Puszczy Białowieskiej
    Rate and direction of changes in tree species composition of natural stands in selected forest associations in the Bialowieza Forest
    Autorzy:
    Paluch, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1313006.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    Puszcza Bialowieska
    drzewostany naturalne
    zbiorowiska lesne
    sklad gatunkowy
    bor swiezy brusznicowo-sosnowy
    bor mieszany trzcinnikowo-swierkowy
    grad miodownikowo-grabowy
    grad typowy
    grad trzcinnikowy
    leg olszowo-jesionowy
    zmiany skladu gatunkowego
    podobienstwo skladu gatunkowego
    stale powierzchnie obserwacyjne
    hornbeam expansion
    natural stands
    permanent study plots
    ash dieback
    Białowieża forest
    Opis:
    The main aim of the study was to determine changes in the species composition and structure of natural tree stands in the Białowieża Forest (BF), which occurred in the years 1975-2012, as well as to evaluate their trends, directions and rate. The study was carried out on 121 permanent research plots (50×50m), which represented the most important forest phytocenoses in BF, i.e. fresh pine-whortleberry forest Vaccinio vitis-idaeae-Pinetum Sokoł. 1980, fresh mixed spruce-reed grass forest Calamagrostio-Piceetum Soko³. 1968, oligotrophic form of hornbeam - bastard balm forest Melitti-Carpinetum Soko³. 1976, different forms of linden- hornbeam forest: Tilio-Carpinetum Tracz. 1962, alder-ash forest Fraxino-Alnetum W. Mat. 1952 and sub-boreal spruce forest on bog moss Sphagno girgenshonii- Piceetum Polak. 1962. On the plots selected, there was measured the diameter at breast height (DBH) of all trees, as well as every tree and shrub up to 1.3 m high was counted and described with reference to species. The measurements and observations were regularly repeated every 10-15 years. The results showed that over the last period of nearly 40 years, there has increased a share of common hornbeam Carpinus betulus L. in the structure of forest stands in numerous BF associations. This tree species has expanded into different forest habitats including poor, medium fertile and wetland sites. The results obtained indicate a trend towards formation of linden-hornbeam forests in BF phytocenoses. The most evident changes were recorded in hornbeam - bastard balm forest. In natural conditions of the majority of forest associations analyzed, there prevailed hornbeam trees in forest regeneration, except for the stands in fresh mixed pine forest and spruce forest on bog moss. In the latter two cases, hornbeam showed signs of its presence in the last observation period. Norway spruce (Picea abies L.) retreated into oligotrophic forest associations. In the recent decades, spruce populations have been dramatically reduced in the stands in mixed coniferous and different kinds of broadleaved forests. There have also decreased a share of light-demanding tree species, such as Scots pine (Pinus silvestris L.), pedunculate oak (Quercus robur L.) and silver birch (Betula pendula L.) in BF tree stands, including their regeneration-layer. Especially, Scots pine regeneration has not been successful. In the short period of time (about 15 years) there has been observed rapid and outsized reduction of ash Fraxinus excelsior L. populations in natural conditions of alder-ash forests. All through the last 10-15 years, there has been also observed increased rate of change in stand species composition. The trend and rate of change in stand species composition point out to a possibility of human intervention towards stimulation of natural regeneration so as to preserve valuable populations of threatened tree species in the Białowieża Forest.
    Źródło:
    Leśne Prace Badawcze; 2014, 75, 4; 385-406
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Odnowienie naturalne dębu w Leśnym Kompleksie Promocyjnym "Puszcza Białowieska" - stan, warunki i perspektywy
    Autorzy:
    Paluch, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1022909.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesne kompleksy promocyjne
    Quercus
    lesnictwo
    dab
    odnowienia naturalne
    Puszcza Bialowieska
    drzewa lesne
    oak
    natural regeneration
    białowieża primeval forest
    hornbeam expansion
    Opis:
    The paper presents the state and conditions of oak natural regeneration in the „Białowieża Primeval Forest” Promotional Forest Complex. It has been stated that under natural conditions oak appears in all forest types but it infrequently grows into a stand. With the recent expansion of hornbeam, it is difficult for oak effectively to regenerate. It has been confirmed in this study that the shelterwood cutting system (leaving some trees to dye naturally) is the most efficient method of natural regeneration of oak in the Białowieża stands.
    Źródło:
    Sylwan; 2005, 149, 01; 30-41
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Definicja lasu w ujęciu krajowym i międzynarodowym oraz jej znaczenie dla wielkości i zmian powierzchni lasów w Polsce
    National and international definition of forest and its importance for the forest area in Poland
    Autorzy:
    Jabłoński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/989804.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    lasy
    tereny lesne
    powierzchnia lasow
    definicje
    Polska
    Organizacja Narodow Zjednoczonych
    Protokol z Kioto
    forest definition
    forest cover
    land use
    forest expansion
    afforestation
    kyoto protocol
    Opis:
    Sustainable forest management, the leading topic in forest and environmental policy since the 1990s, has required an appropriate tools for both clarification of general principles and measurement of its progress. Many of indicators developed for these purpose are based on forest area. However, definitions of forest are not compatible, especially on national and worldwide scale. Definition of forest applied by FAO refers to crown cover and land use, while definition adopted for reporting under Kyoto Protocol refers only to the occurrence of trees. Polish Act on Forest applies the destination of land use as a determinant of forest. Paper analyses the process of forest area assessment in Poland for the purpose of national as well as FAO and UNFCCC reporting. Natural expansion of trees on abandoned agriculture land, still classified as the agriculture areas in cadastral system, was recognized as the biggest challenge of forest area assessment in Poland. Although natural succession is described by many authors, the total area subjected to this process is unknown. According to the FAO and Kyoto Protocol rules such areas should be reported as forests. As a consequence, forest area in Poland could be at least a few hundred thousand hectares higher than reported in the last assessments basing only on cadastral system. The proper classification of forests not recorded in the cadastral system would also be important challenge, otherwise between forest area on country and international level will be a huge discrepancy. But, there are some areas classified as a forest in Poland, which probably should not be included within FAO and Kyoto reporting. However, the most important topic concerns the possibility of identification of afforested areas, submitted under article 3.3. of Kyoto Protocol, basing on forest area changes between 1989 and 2012. One should recognise if afforested area is not overestimated using such approach, as a result of modification of forest definition in Poland in 1991. Additional question concerns the forest lands included into cadastral system after 1990, but afforested or resulting from natural succession occurring before that time, which currently are reported as afforestation under article 3.3. of Kyoto Protocol.
    Źródło:
    Sylwan; 2015, 159, 06; 469-482
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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