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Wyszukujesz frazę "beech forest" wg kryterium: Temat

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Jodła pospolita (Abies alba Mill.) w drzewostanach zespołu żyznej buczyny karpackiej (Dentario glandulosae-Fagetum)
    Common fir (Abies alba Mill.) in stands of the complex of the fertile carpathian beech (Dentario glandulosae-Fagetum)
    Autorzy:
    Sugiero, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1022742.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    jodla pospolita
    wzrost roslin
    odnowienia lasu
    zyzna buczyna karpacka
    Abies alba
    lesnictwo
    Nadlesnictwo Krasiczyn
    drzewostany jodlowo-bukowe
    drzewa lesne
    common fir
    common beech
    fertile carpathian beech forest (dentario glandulosae−fagetum)
    fir−beech stand
    Opis:
    This study presents results of measurements carried out in 2001 in five two−generation mature fir−beech stands growing on the upland forest site in the Krasiczyn Forest Division (Krosno Regional Direction of State Forests − RDSF). The collected experimental material was subjected to analysis in individual stand strata from the point of view of the evaluation of the condition and growth and regeneration potentials of the common fir as an important admixture species in stands of the fertile Carpathian beech complex.
    Źródło:
    Sylwan; 2005, 149, 11; 42-49
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Height-diameter models for mixed-species forests consisting of spruce, fir, and beech
    Autorzy:
    Petras, R.
    Bosela, M.
    Mecko, J.
    Oszlanyi, J.
    Popa, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/38691.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    height-diameter model
    mixed-species forest
    tree
    spruce
    fir
    beech
    Abies alba
    Picea abies
    Fagus sylvatica
    Opis:
    Height-diameter models define the general relationship between the tree height and diameter at each growth stage of the forest stand. This paper presents generalized height-diameter models for mixed-species forest stands consisting of Norway spruce (Picea abies Karst.), Silver fir (Abies alba L.), and European beech (Fagus sylvatica L.) from Slovakia. The models were derived using two growth functions from the exponential family: the two-parameter Michailoff and three-parameter Korf functions. Generalized height-diameter functions must normally be constrained to pass through the mean stand diameter and height, and then the final growth model has only one or two parameters to be estimated. These “free” parameters are then expressed over the quadratic mean diameter, height and stand age and the final mathematical form of the model is obtained. The study material included 50 long-term experimental plots located in the Western Carpathians. The plots were established 40–50 years ago and have been repeatedly measured at 5 to 10-year intervals. The dataset includes 7,950 height measurements of spruce, 21,661 of fir and 5,794 of beech. As many as 9 regression models were derived for each species. Although the “goodness of fit” of all models showed that they were generally well suited for the data, the best results were obtained for silver fir. The coefficient of determination ranged from 0.946 to 0.948, RMSE (m) was in the interval 1.94–1.97 and the bias (m) was –0.031 to 0.063. Although slightly imprecise parameter estimation was established for spruce, the estimations of the regression parameters obtained for beech were quite less precise. The coefficient of determination for beech was 0.854–0.860, RMSE (m) 2.67–2.72, and the bias (m) ranged from –0.144 to –0.056. The majority of models using Korf’s formula produced slightly better estimations than Michailoff’s, and it proved immaterial which estimated parameter was fixed and which parameters were free.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2014, 56, 2
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and dynamics of selected stands of primeval character in the Pieniny National Park
    Autorzy:
    Jaworski, A
    Podlaski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/41477.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Pieniny National Park
    forest
    species composition
    structure
    stand
    development stage
    fir
    Abies alba
    beech
    Fagus sylvatica
    plant regression
    Opis:
    The purpose of this study was to determine changes which occurred during 23 years (1974–1997) in four stands in respect of species composition, structure, developmental stages and phases. In 1997 the Walusiowka stand represented the growing up stage, phase of a multistory structure, and during the study period its volume decreased from 698 to 676 m3/ha.The Przełęcz Sosnow stand was in the growing up stage, phase of a little diversified storied structure and regeneration, and its volume decreased from 696 to 622 m3/ha.The Grodek stand during the entire study period was in the growing up stage, phase of the selection forest structure and regeneration, and its volume increased from 529 to 585 m3/ha.The Facimiech stand in 1997 was in the optimum stage, phase of aging and regeneration, and its volume decreased from 688 to 661 m3/ha.During 1974–1997 the percentage of fir (Abies alba) considerably decreased in three stands (Walusiowka from 46 to 33%, Przełęcz Sosnow from 58 to 36%, Grodek from 42 to 24%).The Facimiech stand was almost a pure fir stand during the entire control period. In the Przełęcz Sosnow stand, due to a rapid mortality of fir and presence of vital trees of beech (Fagus sylvatica) of the growing up and optimum growth generations, the break up stage did not take place but the growing up stage had developed, which indicated the disturbance of the natural cycle of the primeval forest described by Korpel’. A scarce presence of fir upgrowth and prevalence of beech in stands composed of these two species permits to suppose that fir will be retreating in favor of beech.
    Źródło:
    Dendrobiology; 2007, 58; 25-41
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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