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    Wyświetlanie 1-4 z 4
    Tytuł:
    Z zagadnień doskonalenia metod dendrometrycznych
    Iz problem sovershenstvovanija dendrometricheskikh metodov
    Problems of the improvement in dendrometric techniques
    Autorzy:
    Guminski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/825046.pdf
    Data publikacji:
    1971
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    dendrometria
    metody pomiarow
    metody obliczen
    przyrost miazszosci
    Źródło:
    Sylwan; 1971, 115, 12
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Problematyka pomiarów oraz określania miąższości martwego drewna na kołowych powierzchniach próbnych
    Measurement and calculation of the volume of deadwood on circular sampling plots
    Autorzy:
    Bujoczek, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/989747.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    powierzchnie probne kolowe
    drewno martwe
    miazszosc drewna
    pomiary drewna
    metody pomiarow
    coarse woody debris
    snags
    shape
    decomposition
    field methods
    volume determination
    Opis:
    The paper analyzes two methods of deadwood (DW) measurements on circular sampling plots. In the first method, the volume of DW is measured within the circumference of the sampling plot irrespective of the fact whether the live tree was located inside or outside the plot. The other method requires the measurement of only that DW, which can be attributed to trees that originally grew within the sampling plot. This requires identification all debris fragments originating from those trees both within and outside the sampling plot. Additionally, the paper compares the results obtained using Smalin's and Huber's formulas and discusses the influence of decomposition stage on the calculated volume of lying deadwood. Measurements were conducted in two stands. In each of them 20 circular sampling plots (4 or 5 ares) were established. In both stands, the second investigated measurement method led to a lower mean DW volume (by 6.3% and 27.2%). In practice, it was very difficult to identify DW from the outside of the sampling plots as high trees growing close to the plot had their fragments lying up to several dozen meters away. If a tree was very fragmented upon falling, it was difficult to find all the relevant pieces of DW and determine whether they derived from the sampling plot or not. The volume of lying DW calculated according to Smalin's formula was by 5% higher. In case of 7.7% of the 194 inventoried fragments of lying DW the transverse cross−section changed from circular to misshapen. The application of formulas accounting for decomposition decreased the calculated volume of lying DW by 5.1%. Taking into consideration the time−effectiveness and accuracy of measurements, it has been found that for most stands the best method is to measure the ends of DW pieces, calculating the length of segments from polar coordinates (using the measurement principles presented in the figures). In addition, especially in measuring large trees, one should take into account changes in shape attributable to decomposition, which may influence the calculation of DW volume. It is recommended that all DW fragments within a circular sampling plot should be measured irrespective of whether the tree from which they derive grew inside or outside the plot.
    Źródło:
    Sylwan; 2015, 159, 10; 795-803
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
      Wyświetlanie 1-4 z 4

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