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    Wyświetlanie 1-3 z 3
    Tytuł:
    Liczba i wielkość jednostek próbnych do pomiaru leżących martwych drzew metodą liniową
    Number and size of sample units for the estimation of coarse woody debris volume using the line intersect method
    Autorzy:
    Miścicki, S.
    Sołtys, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/980334.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    obszary chronione
    obszar ochrony scislej Bukowa Gora
    drzewa martwe
    zasoby drzewne
    miazszosc drzew
    metody pomiarow
    metoda liniowa
    linie probne
    bukowa góra
    protected forest
    sampling line
    single−tree−plot coefficient of variation
    standard error
    time of measurements
    Opis:
    The line intersect method is recommended for coarse woody debris (CWD) inventories. This is due to the fact that for the CWD volume estimation with the assumed standard error (SE), the total time of measurements using line sampling units is shorter than when using the fixed−area sample units. The aim of the research was to determine: (1) the number and size of sample units whose use will allow achieving the assumed SE of the CWD volume estimation, and (2) dependence of this number and size of sample units on the quantity of CWD. The research material was collected from 131 sample units (sampling lines) with a length of 50.48 m each. They were systematically located in the stands (128 ha) on Bukowa Góra in the Roztocze National Park (south−east Poland). Data concerning the intersection points of the sampling line (in relation to its beginning) with the axis of a downed log, made it possible to simulate the measurement using shorter sampling lines (4, 8, …, 44 m) than the original ones. The simulation was performed using the original data (when the average CWD volume was 73 m3/ha), which also represented an inventory unit in which the CWD volume accounted for 10, 40 and 70% of the original value. These data were obtained by a random elimination of the appropriate portion of trees. The relationship between the single−tree−plot coefficient of variation (calculated for such a size of a sample unit which on average contains only one log) and the length of the sampling line was determined (figs. 2 and 3). On this basis the number of sample units necessary to obtain the assumed SE value of the target variable was determined (tab. 1). Using the data on labour consumption of individual measurement operations, the total working time was calculated for such a number of sample units that would guarantee obtaining the assumed SE of the CWD volume estimation (tab. 2). The total time of measurements was longer in an inventory unit with scarcer CWD resources (figs. 5 and 6). The optimal (due to the time of measurements needed to achieve the assumed SE of the CWD volume estimation) line length occurred within the range of 4−150 m. The use of sample units with a length of 60−150 m each was recommended in forests with the average CWD volume over 30 m3/ha, and with a length of 150−200 m in forest with sparser CWD resources.
    Źródło:
    Sylwan; 2019, 163, 01; 35-46
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Określenie przy pomocy krzywej równowagi pożądanej struktury liczby drzew w lesie różnowiekowym
    Determination of the desirable tree abundance pattern in the uneven-aged forest using the equilibrium curve
    Autorzy:
    Kweczlich, I.
    Miścicki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1019275.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    Roztoczanski Park Narodowy
    krzywa rownowagi
    Abies
    rezerwaty przyrody
    buk
    lesnictwo
    model rownowagi dla lasu
    Fagus
    drzewostany roznowiekowe
    rezerwat Bukowa Gora
    obliczenia
    urzadzanie lasu
    jodla
    struktura drzew
    equilibrium curve
    tree density
    forest regeneration
    strict protection
    selection forest
    fir
    beech
    bukowa góra
    roztoczański national park
    Opis:
    The theoretical tree density in a stand was calculated using an equilibrium curve model. The Bukowa Góra forest (Roztoczański National Park) placed under strict protection was the object of the study. Calculations were made separately for the main species − fir and beech. The data on tree mortality rate and their diameter growth (or height in the case of low trees) collected in 1991, 1996 and 2001 on permanent sample plots were used. The correspondence between the actual and model tree density curves in diameter classes was confirmed only in the case of firs from the upper layer of stands. The shortage of firs (in comparison with the model data) and the excess of beeches in the regeneration layer in respect of thin and moderately thick DBH were confirmed by gradual changes in tree−species composition between 1991 and 2001.
    Źródło:
    Sylwan; 2006, 150, 03; 17-30
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prognoza rozwoju drzewostanów lasu naturalnego z wykorzystaniem modelu według klas wymiarów
    Forecast of the development of natural forest resources using a size-class growth model
    Autorzy:
    Gazda, A.
    Miscicki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/972934.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany
    buk zwyczajny
    Fagus sylvatica
    Abies alba
    modele wzrostu
    las naturalny
    prognozowanie rozwoju
    Roztocze
    leśnictwo
    Bukowa Góra
    jodła pospolita
    model wzrostu według klas wymiarów
    silver fir
    increment
    mortality
    Roztoczański National Park
    European beech
    Opis:
    The size−class growth model is an empirical model applicable for the prediction of the dynamics of natural forest growth. It is based on the following assumptions: (1) changes in the forest condition are determined on the basis of the sum of the changes that take place in individual size classes, (2) the trees in a given class are represented by single average tree, (3) the calculation of the future tree density distribution in size classes (fig. 1) is the main element of the prediction, and (4) the future tree density distribution is estimated on the basis of the initial structure, actual growth and mortality of trees in individual size classes. The aim of the research was to develop a size−class growth model to be used for the preparation of a medium−term forecast of natural forest dynamics. The study site is located on the Bukowa Góra Mt in the Roztoczański National Park (SE Poland). For the analyses we took all uneven−aged stands (128 ha in total) composed mostly of silver fir and European beech. The material was collected on 65 permanent sample plots every five years in the period 1991−2011. Trees with the breast height diameter (DBH)8 cm were measured on each sample plot (500 m2), while smaller trees – on three smaller concentric plots. We calculated, separately for fir and beech, the relationship between the mortality of trees and their diameter (fig. 2), the relationship between the diameter increment of trees and their DBH (figs. 3−4), the rate of saplings (h=0.3−1.3 m) growth into the first DBH class (DBH=0.1−1.9 cm). On the basis of these data, we elaborated a size−class growth model that we used to predict the development of timber resources (trees with DBH 8 cm) at 10−year intervals in the period 2001− −2041. In 2011, the predicted average standing volume was lower than the one actually measured. The forecast indicated an increase in the average standing volume (fig. 5), a reduction in the volume of ingrowth (fig. 6), an increase in the proportion of beech in the standing volume and ingrowth (figs. 5 and 7) and the maintenance of a similar density structure (fig. 8) throughout the period 2001−2041. The low accuracy of the prediction after 10 years (in 2011) was caused by the difference between the predicted and actual values of tree growth and mortality in the period 2001−2011.
    Źródło:
    Sylwan; 2016, 160, 03; 207-218
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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