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    Wyświetlanie 1-6 z 6
    Tytuł:
    Smukłość modrzewia europejskiego (Larix decidua Mill.) i jej związki z innymi cechami biometrycznymi
    Slenderness of European larch (Larix decidua Mill.) and its relationships to other biometric parameters
    Autorzy:
    Kaźmierczak, K.
    Nawrot, M.
    Pazdrowski, W.
    Jędraszak, A.
    Najgrakowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/994964.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    dendrometria
    drzewa lesne
    siedliska lesne
    modrzew europejski
    Larix decidua
    smuklosc drzew
    wiek drzew
    piersnice drzew
    wysokosc drzew
    powierzchnia rzutu korony
    srednica korony
    dlugosc korony
    korelacja cech
    larch
    slenderness
    age
    forest habitat type
    tree growth area
    crown projection area
    Opis:
    The study presents the relationships between larch slenderness and age, breast height diameter, height, crown width, crown projection area, crown length and habitat type. The study comprised larch trees in a dominant stand of different age classes growing in fresh mixed coniferous (BMśw), fresh mixed deciduous (LMśw) and fresh deciduous (Lśw) forest habitats. The slenderness of each larch was calculated as the ratio of tree height to breast height diameter. The crown projection area was calculated as a circle with a radius equal to the average radius of the crown. The average crown radius was established after its projection in the four main geographical directions. The crown length was calculated as the difference between the height of a tree and the height of crown location. Also an attempt was made to describe tree slenderness using multiple regression equations.
    Źródło:
    Sylwan; 2012, 156, 02; 83-88
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Indukcyjna metodyka prognozy rozwoju zasobów drzewnych
    Inductive methodology of the forecast of wood resources development
    Autorzy:
    Wysocka-Fijorek, E.
    Zajączkowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/979067.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    harvest growth increment
    volume
    area
    resource modelling
    Opis:
    For effective forest management, comprehensive information on the condition and structure of wood resources is needed, as well as a forecast of their development and the possibility of harvest cutting in the long term. The paper objectives is to present a methodology of predicting the development of wood resources and the possibility of main cutting based on the current state of the forest. Presented methodology of the forecast preparation is based on the inductive type of prediction in which future directions of changes are predicted based on past events. Such forecast finds expression of conscious human activity in actively shaping the future, while it does not seek to determine the target state of the forest, but it is assumed that shaping the state of the forest can be subject to constant evolution. The forecast of the development of wood resources in individual forest areas may be based on the data contained in the forest management plans, and these data may be compiled either for individual forest districts (or other forest units), or for groups of forest districts (e.g. for regional directorates of the State Forests, or the State Forests in total). The initial data, necessary to make forecasts, are primarily: a tabular comparison of the stands area and volume in age classes and subclasses; projected afforestation area; intensity indicators of final cutting and intermediate felling determining the harvesting intensity in relation to the size of wood resources in individual classes and age subclasses; and the expected volume of current volume increment over the adopted forecast periods. Additional data contains: approximate share of clear− and complex cutting in final felling; adopted distribution according to the age classes of the young generation after removal cuts in stands kept in complex cutting; average length of the regeneration period; and average age of stands in regeneration classes – used to determine the average age in forest areas for which a forecast is made. Presented methodology makes it possible to determine and analyse anticipated changes in area and volume in age classes, average age and average stand volume as well as possibilities of final and intermediate cutting, and the harvesting intensity in relation to the size of wood resources and the current volume increase in the adopted forecast periods.
    Źródło:
    Sylwan; 2020, 164, 04; 267-279
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zapis zmian zachodzących w środowisku przez sosnę zwyczajną oraz sosnę Banksa
    Record of the changes in environment by Scots pine and Jack pine trees
    Autorzy:
    Wilczyński, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/979308.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    basal area increment
    growth reduction
    pollution
    air temperature
    dendroclimatology
    Opis:
    The aim of the study was to investigate how industrial pollutants and change of thermal conditions of winter season in the second half of the 20th century affected the basal area increment (BAI) and the climatic signal in the BAI chronologies of Pinus sylvestris and Pinus banksiana. Samples were collected from 21 trees of both species growing in the Chrzanów Forest District (50°20' N, 19°47' E) which is located between the Upper Silesian and Krakow Industrial Regions. Two cores were taken from each tree. Tree−ring widths were measured at the cores and the BAI for each year in the period 1930−2016 was calculated. The growth reductions of both pine species in the years 1951−1970, increasing of diversity of growth reactions from year to year and also reduction of strength of climatic signal in the period 1963−1994 may have been caused by industry pollution. The reduction of wood growth, the increase of the diversity of short−term incremental reactions and also the reduction of strength of the climatic signal were greater in Jack pine. This indicates that Scots pine was more resistant to pollution. As an industrial production declined and environmentally friendly technologies were introduced in the 1990s homogeneity of growth reactions and strength of dependence between BAI and climate parameters in both species increased. A significant increase in the strength of the relationship between January temperature and BAI of Scots pine and Jack pine was observed in the early 2000s. This may suggest that the vegetation season starts already in January in the study area.
    Źródło:
    Sylwan; 2020, 164, 07; 583-593
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Retrospektywna analiza wzrostu i przyrostu drzew w 30−letnim drzewostanie jodły kalifornijskiej (Abies concolor Eng.)
    Retrospective analysis of growth and increment of trees in 30−years−old stand of white fir (Abies concolor Eng.)
    Autorzy:
    Beker, C.
    Flieger, K.
    Turski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/994778.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany sosnowe
    sosna kalifornijska
    Abies concolor
    wzrost roslin
    dynamika wzrostu
    przyrost wysokosci
    przyrost piersnicowego pola przekroju
    przyrost miazszosci
    white fir
    growth
    height
    breast height diameter
    basal area
    volume
    Opis:
    The paper presents the results of the retrospective research on the height and diameter growth of trees in a 30−year−old white fir (Abies concolor Eng.) stand growing in the mixed broadleaved forest habitat in the Forest Experimental Station in Siemianice. The research concerned the volume and functionally related parameters including height, diameter at breast height and basal area.
    Źródło:
    Sylwan; 2012, 156, 12; 902-907
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Występowanie i przemieszczanie się biegaczowatych na zrębie z pozostawionymi kępami starodrzewu
    The distribution and movement of ground beetles on a cutting area with retained old-growth clumps
    Autorzy:
    Skłodowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1013543.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    gatunki nielesne
    Puszcza Czluchowska
    lesnictwo
    bioindykacja
    drzewostany sosnowe
    kolonizacja
    gatunki lesne
    kepy drzew
    bioindykatory
    biegaczowate
    wedrowki zwierzat
    lownosc
    zrab zupelny
    Carabidae
    cutting area
    old−growth clumps
    carabidae
    movement
    colonisation
    semivariogram
    Opis:
    The colonisation and movement of ground beetles on a cutting area with two retained old−growth clumps of 4 and 7 are were investigated using the CMR method. The method enabled to evaluate the trapping level of small non−forest species. The paper discusses the use of old−growth clumps during the colonisation of the cutting area by big forest species and concurrent "avoidance" of these areas by small non−forest species. Stimulating role of the parallel and perpendicular ploughing furrows in the process of the colonisation the cutting area by forest and non−forest species as well as differences in their perception of site micro−differences were also analysed. The results confirmed assumed hypothesis in case of non−forest species (avoidance of clumps), forest species C. arcensis and non−forest species P. caerulescens and individuals from the genera Amara and Harpalus as far as the influence of furrows is concerned. Differences in the perception of the cutting area between forest and non−forest species were also proved.
    Źródło:
    Sylwan; 2008, 152, 09; 31-43
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza wybranych cech przestrzeni wzrostu pojedynczego drzewa na przykładzie 135-letniego drzewostanu dębowego
    Analysis of selected features of the growth space of a single tree on the example of a 135 years old oak stand
    Autorzy:
    Kaźmierczak, K.
    Stosik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1013435.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    dendrometria
    przestrzen wzrostu
    klasy Krafta
    lesnictwo
    Quercus
    szerokosc korony
    procent wykorzystania jednostkowego pola
    drzewostany debowe
    przestrzen pojedynczego drzewa
    powierzchnia rzutu korony
    wysokosc drzew
    dab
    piersnice drzew
    drzewa lesne
    growth space
    crown projection area
    oak
    Opis:
    The paper presents the results of an analysis of the features of the growth space of a single tree in a 135 years old oak stand. The following measures of the growth space of a tree were selected and determined: crown projection area – pk [m2], crown diameter – dk [m], Seebach's growth space number (also called the crown deflection degree) – dk/d1,3, crown projection area to basal area ratio – d 2 k /d 2 1,3, space use degree – r/s, space of a single tree – ppd=pk·h [m3], crown spread (crown deflection coefficient) – dk /h and percentage use of a unit area – pwjp=100·pk /pj [%]. Also the biosocial position of each tree was determined.
    Źródło:
    Sylwan; 2008, 152, 02; 3-9
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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