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    Tytuł:
    Wybrane cechy rozdzielcze i kryteria separacji nasion modrzewia europejskiego
    Autorzy:
    Tylek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1023435.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    sortowanie
    nasiona
    modrzew
    wlasciwosci fizyczne
    lesnictwo
    Larix
    separacja
    drzewa lesne
    european larch
    seeds
    physical features
    separation
    sorting
    Opis:
    The paper presents results of measurements of physical features of larch seeds such as weight, bulk density, geometric and aerometric features and elasticity. The division into viability classes proposed by the author allows to use these features at the stage of designing seed separation processes.
    Źródło:
    Sylwan; 2004, 148, 04; 27-33
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tarcie i sprężystość jako cechy rozdzielcze bukwi
    Friction and elasticity as separation properties of beech nuts
    Autorzy:
    Tylek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1018525.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    sprezystosc
    buk zwyczajny
    orzeszki bukowe
    nasiona
    tarcie
    rozdzial nasion
    lesnictwo
    Fagus sylvatica
    drzewa lesne
    beech seeds
    distinctive features
    friction
    elasticity
    sorting
    Opis:
    In the work external friction and elasticity of beech nuts were measured taking into consideration their classification into the defined embryo development classes. An attempt was made to answer the question whether the mentioned physical−and−mechanical properties are distinctive features of beech seeds and to determine the theoretical separation effectiveness on the basis of the analysed properties.
    Źródło:
    Sylwan; 2006, 150, 05; 51-58
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena dokładności określenia zasobności drzewostanów w obrębowej metodzie inwentaryzacji zapasu
    Accuracy assessment of stand volume determination in district inventory method
    Autorzy:
    Nowakowska, J.
    Wójcik, R.
    Sierdziński, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1009395.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    urzadzanie lasu
    drzewostany
    zasobnosc drzewostanu
    zapas drewna
    inwentaryzacja lasu
    metoda obrebowa
    miazszosc drzew
    cechy taksacyjne
    dokladnosc pomiaru
    district inventory method
    volume
    inventory features
    Opis:
    The research revealed an increase in accuracy of stand volume determination at induvidual stand and groups of stands level. Errors appeared in determination of such features as stand quality class, average diameter breast high of stand, average height and stocking index.
    Źródło:
    Sylwan; 2010, 154, 08; 535-544
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stawonogi uszkadzające drewno w badaniach poligonowych
    Variability of chemical features of upper horizons in forest soils on the example of Dupnianski stream catchment in the Beskid Slaski Mts.
    Autorzy:
    Zwydak, M.
    Małek, S.
    Jodłowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1013205.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    wlasciwosci chemiczne
    Beskid Slaski
    gleby lesne
    zlewnia Potoku Dupnianskiego
    poziom mineralny
    poziom organiczny
    drzewostany swierkowe
    lesnictwo
    poziom prochniczny gleby
    zmiennosc
    mountain soils
    norawy spruce stand
    chemical features
    variavility
    Opis:
    The objective of the study was to investigate variability of chemical features of upper horizons in forest soils as well as confirmation of collecting the mixed sample that is supposed to describe the soil conditions more effectively. The lowest variability (ca 10%) was observed for pH in H2O and KCl as well as C/N ratio. The highest coefficient of variance exceeded 100% (Ca content). For almost all analysed chemical parameters, the results obtained for mixed sample (average of 5 samples systematically distributed within the study area) are in ±1 standard deviation range from the average of 25 individual samples.
    Źródło:
    Sylwan; 2008, 152, 08; 66-72
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Ocena zmienności cech adaptacyjnych oraz określenie wartości genetyczno-hodowlanej pochodzeń objętych ochroną w Regionalnym Banku Genów buka zwyczajnego RDLP w Katowicach
    Assessment of the variation of the adaptation features and of the gegetic breeding value of provenances protected under the scheme of the Regional Gene Bank for European beech operated by the Katowice Regional Forest Directorate
    Autorzy:
    Sabor, J.
    Stanuch, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1017107.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    zmiennosc cech
    buk zwyczajny
    Regionalny Bank Genow Buka RDLP Katowice
    proweniencje
    lesnictwo
    adaptacja
    wartosc hodowlana
    Fagus sylvatica
    wartosc genetyczna
    drzewa lesne
    provenance
    adaptation features
    beech
    regional gene bank
    selection indices
    Opis:
    The study focuses on the variation of the adaptation features of forty partial populations of beech from the area managed by the Katowice Regional Forest Directorate. The growth and development of the provenances were assessed in the years 1998−2003 by measuring the height and survival of seedlings in the juvenile phase, i.e. up to the fourth year of planting on comparative plantations of the Regional Gene Bank that were established at two different forest sites of the area. The selection indices of the provenances were calculated from the variation components.
    Źródło:
    Sylwan; 2007, 151, 10; 25-37
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmienność wybranych wskaźników struktury włókien drewna brzozy brodawkowatej (Betula pendula Roth.) w północno-wschodniej Polsce
    Variability of the wood fibre structure indices for silver birch (Betula pendula Roth.) in north-eastern Poland
    Autorzy:
    Lachowicz, H.
    Paschalis-Jakubowicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1008914.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewa lesne
    lokalizacja
    wiek drzew
    brzoza brodawkowata
    Betula pendula
    wlokno drzewne
    struktura wlokien
    wskaznik smuklosci
    wskaznik gietkosci
    wskaznik sztywnosci
    wskaznik sztywnosci Runkla
    wskaznik Muhlstepha
    silver birch
    fibre structure indices
    wood anatomic features
    Opis:
    The variation of the fibre structure indices was determined for silver birch. The examined trees came from north−eastern Poland, which is the largest source of raw material of this species. Wood samples were taken for measurement from trees aged 45 and 70 years that grew in the fresh deciduous forest habitat. Fibre structure indices measuring felting, flexibility, rigidity, rigidity according to Runkel as well as Mühlsteph's and compactness indices were selected as the basic fibre pulp properties and subjected to statistical analysis. A significant effect of the location and age of trees on all wood fibre structure indices except for the effect of age on the compactness index was found. The studies also showed a significant, simultaneous effect of tree location and age on the mean values of all analysed indices of silver birch wood fibre structure.
    Źródło:
    Sylwan; 2011, 155, 07; 446-458
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zróżnicowanie bonitacji wzrostowej drzewostanów daglezjowych w Polsce
    Variability of the site index of Douglas fir stands in Poland
    Autorzy:
    Bijak, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/987057.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewa lesne
    daglezja zielona
    Pseudotsuga menziesii
    drzewostany daglezjowe
    wzrost drzewostanu
    bonitacja wzrostowa
    siedliska lesne
    bonitacja siedliska
    gleby lesne
    rzezba terenu
    Polska
    site index
    soil type
    forest site type
    relief features
    pseudotsuga menziesii
    Opis:
    The objective of the study was to analyse the site index (SI) of Douglas fir (Pseudotsuga menziesii) stands in relation to the forest habitat type, soil type and relief characteristics. We utilised infor− mation available in the Information System of the State Forests in Poland that included selected parameters describing habitat conditions and dendrometric characteristics of Douglas fir stands. In total, processed data referred to 863 stands with a total area of 1,644.45 ha. As the SI distribution was not consistent with the normal one (Shapiro−Wilk test, p <0.0001) we applied Kruskal−Wallis or Mann−Whitney tests to assess the significance of observed differences. Site index of surveyed stands ranged from 19.9 to 47.8 m, 32.6 m on average (standard deviation of 3.3 m). Douglas fir in northern and southern Poland characterized by higher SI than in western and south−western part of the country (HK−W=83.5; p<<0.001; fig. 2). Forest habitat type significantly distinguished analysed stands (HK−W=30.1; p<<0.001). The highest SI values were observed for mixed deciduous habitats (fig. 3). For more fertile fresh deciduous habitats Douglas fir achieved slightly lower site index, while the least fertile mixed coniferous habitats are characterized by significantly lower SI. Habitat moisture variant had no significant effect on the average SI values (HK−W=2.6; p=0.269). The highest values were found in strongly fresh habitats (32.8 ±4.1 m), while the lowest in the humid variant (31.7 ±3.4 m). We found significant influence of soil type (HK−W=23.2, p<0.001) even though the average SI values for each category were relatively similar (fig. 4). The highest values were observed for Cambisols (33.3 ±3.7 m), while the lowest for Arenosols (32.1 ±3.0 m). Particle size distribution is an important factor for Douglas fir site index (tab.). We found that the heavier material (the higher the content of silt and clay), the significantly higher SI values (HK−W=16.9; p=0.001). Mean SI for stands growing on former farmlands (32.0 ±3.3 m) and on forest areas (32.7 ±3.3 m) were not significantly different (ZM−W=1.73; p=0.084). There was no significant effect of the relief forms on site index surveyed Douglas fir stands apart from the fact that stands growing on slopes are characterized by significantly higher SI (ZM−W=1.99; p=0.047).
    Źródło:
    Sylwan; 2017, 161, 03; 208-217
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena buka zwyczajnego w uprawach z wyższych położeń Beskidu Śląskiego i Żywieckiego
    Assessment of European beech in cultures located at higher altitudes of the Beskid Slaski and Zywiecki
    Autorzy:
    Małek, S.
    Barszcz, J.
    Kędziora, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1009100.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Beskid Slaski
    Beskid Zywiecki
    drzewa lesne
    buk zwyczajny
    Fagus sylvatica
    uprawy lesne
    wysokosc nad poziomem morza
    udatnosc uprawy
    sadzonki
    wzrost roslin
    zywotnosc
    cultures
    european beech
    biometrical features
    survival
    quality
    vitality
    final silviculture assessment
    Opis:
    In autumn 2006, i.e. in the 5th year from the culture establishment, and when the tree growth had finished, on each culture we measured tree height, height increments in the years 2004−2006 and root collar diameters. We also noted the presence of the main shoot and top bud on the main shoot, size and color of the assimilative apparatus and determined the survival rate of the seedlings. The assessed and measured features allowed for determination of the seedling quality and vitality. Mean values of all features were calculated for plots and their groups, distinguished on the basis of their belonging to particular forest districts and regions as well as basing on the presence or absence of stand protection and in regard to stand disintegration. The results indicate the poor condition of parts of the cultures with beech. Generally, the quality and vitality of the seedlings was assessed to be average, with a smaller or larger tendency towards the decrease. This points towards difficulties in performing stand regeneration and in varying their composition in the higher locations of the Beskid Śląski and Żywiecki Mts., which experience extreme climatic conditions. This was observed particularly on height and quality parameters worsened along with an increase in a degree of stand disintegration. Many beech seedlings grew better on the fenced plots than on the unfenced ones, which indicates positive results of the protection of cultures against game and justifies their fencing.
    Źródło:
    Sylwan; 2010, 154, 10; 710-120
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ wybranych czynników ekologicznych na kształtowanie się stabilności górskich drzewostanów świerkowych w Beskidach Zachodnich
    Effect of selected ecological factors on the stability of Norway spruce stands in the Beskidy Zachodnie Mountains
    Autorzy:
    Socha, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1013526.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    smuklosc drzew
    intensywnosc przyrostu miazszosci
    Picea
    lasy gorskie
    drzewostany swierkowe
    stabilnosc
    przyrost miazszosci
    lesnictwo
    wzgledna dlugosc korony
    wskaznik stabilnosci
    swierk
    czynniki ekologiczne
    drzewa lesne
    slenderness
    relative crown length
    volume increment
    topographic features
    stand density
    Opis:
    The research focused on the effect of environmental factors on the stability of mountain spruce forests in the Beskidy Zachodnie. Stand stability was evaluated on the basis of slenderness, relative crown length and intensity of volume increment. The performed analyses show that stands growing at higher elevations are more stable. This is related, among other things, to worse environmental conditions resulting in the lower slenderness value and higher relative crown length.
    Źródło:
    Sylwan; 2008, 152, 03; 40-49
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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