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    Wyświetlanie 1-3 z 3
    Tytuł:
    Określanie miąższości i zagęszczenia drzew w drzewostanach centralnej Polski na podstawie danych lotniczego skanowania laserowego w dwufazowej metodzie inwentaryzacji zasobów drzewnych
    A two-phase inventory method for calculating standing volume and tree-density of forest stands in central Poland based on airborne laser-scanning data
    Autorzy:
    Miścicki, S.
    Stereńczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1318835.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    Polska Centralna
    drzewostany
    zasoby drzewne
    inwentaryzacja
    lotniczy skaning laserowy
    drzewa lesne
    miazszosc drzew
    zageszczenie drzew
    wysokosciowy model korony
    centroid
    ground-based data
    forest inventory
    scaling
    airborne ceiling
    Crown Height Model
    Opis:
    This paper describes a method of determining the stocking density and volume of forest stands based on airborne laser-scanning data. The aim of this study was to determine the relationship between ground-based measurements of standing volume and tree-density, and those acquired based on the Crown Height Model (CHM) interpolated from airborne laser-scanning data. Data were collected from 34 sample plots of two sizes for the CHM analysis: 500 m2 (radius 12.61 m) and 1963.5 m2 (radius of 25.0 m): Trees for sampling were selected using two methods, those whose “centroid” was fully within the sample plot (the tree was considered to be within the sample plot if the centroid of the crown was inside the circle) and those at the “border” (the tree was included in the sample plot if, at least, one part of the contour of the crown was inside the circle). There was a strong relationship (R2 = 0.86) between standing volume measured in sample plots on the ground and the indices produced by the crown elevation model at the locations where the ground-based measurements were performed.
    Źródło:
    Leśne Prace Badawcze; 2013, 74, 2; 127-136
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena dokładności obrębowej metody inwentaryzacji lasu opartej na losowaniu warstwowym
    Assessment of the accuracy of the forest district inventory method based on the stratified sampling
    Autorzy:
    Bruchwald, A.
    Miścicki, S.
    Dmyterko, E.
    Stereńczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/988954.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    miazszosc drzewostanow
    inwentaryzacja lasu
    metoda obrebowa
    losowanie warstwowe
    dokladnosc
    auxiliary variable
    dominant tree species
    sample allocation
    stratum
    Opis:
    The aim of the research was to assess the accuracy of the stratified sampling method used to estimate the standing volume of a forest district and to compare it with the accuracy of simple random sampling methods. The paper presents the variability of the variables affecting the accuracy of the stratified sampling method. We attempted to find the ways to increase this accuracy. The research was based on the empirical material collected on approximately 42,000 sample plots with a size of 50−500 m², and with an average of 737 plots per forest district. The standard deviation of the merchantable volume of trees on sample plots ranged from 87 to 213 m³/ha, with an average of 128 m³/ha. The coefficient of variation ranged from 5.3 to 28.5% (the average 40.8%). Using a simple random sampling method, the standard error of the volume ranged from 3.3 to 10.0 m³/ha (the average 4.8 m³/ha) and the relative error – from 1.01 to 3.41% (the average 1.55%). The absolute error of the stratified sampling method under which strata are formed on the basis of the main tree species and its age ranged from 2.9 to 7.4 m³/ha, the average 4.2 m³/ha, and the relative error ranged from 0.65 to 1.95%, 1.02% on average (tab.). The accuracy of the stratified sampling method was by 15% higher than that of the simple random sampling method. We found that the relationship between the volume of a sample plot and the main tree species and its age measured by the correlation coefficient was 0.453 on average. For the relationship between volume and age of stands this coefficient was on average 0.422, while between volume and main tree species – only 0.118. Stand age – as an auxiliary variable in formation of strata – proved to be of moderate usefulness resulting from a small difference in the standing volume of stands in older age classes. Main tree species turned out to be of slight usefulness in formation of strata, therefore it seems reasonable to find some other auxiliary variables to replace it.
    Źródło:
    Sylwan; 2017, 161, 11; 909-916
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Porównanie sposobów określania składu gatunkowego drzewostanów obrębu leśnego
    Comparison of the methods of determining the tree species composition of stands in a forest district
    Autorzy:
    Bruchwald, A.
    Miścicki, S.
    Dmyterko, E.
    Stereńczak, K.
    Wysocka-Fijorek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/985705.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    sklad gatunkowy
    struktura gatunkowa
    metody badan
    analiza porownawcza
    obreby lesne
    basal area
    cover
    diversity
    sample plot
    survey
    volume
    Opis:
    In Polish forest management planning, the species composition of stands in a forest district is established by adding up the volumes of tree species from individual forest stands. These volumes are calculated according to the estimated share of species cover and the estimated volume of the entire forest stand. The species structure of stands in a forest district, established on the basis of such a method, may be different than that obtained from sample plots. The aim of the study was to compare three ways of determining the tree species structure of stands in a forest district. In Method 1, the species composition was estimated on the basis of the volume of trees measured on sample plots as part of a periodic forest inventory based on stratified sampling. The same data were used in Method 2, but the share of species was calculated on the basis of the basal area. In Method 3, the species structure was estimated according to the volume of trees estimated in each forest stand based on the cover of a given species. The empirical material was collected in 53 forest districts. In method 1 and 2, data from an average of 740 sample plots within the forest district were used. In Method 3, data from the forest stand descriptions contained in the database of the State Forests Information System were used. For each forest district, species composition was calculated, including 6 tree species and 8 groups of tree species. For all forest districts, the average shares of individual species and groups of species differed, depending on the applied method (tab. 1). In case of methods 1 and 2, the biggest difference was found for pine – the most numerous species – but it was also big for less numerous ones: birch and oak (tab. 2). In case of methods 1 and 3, the biggest difference in share was also found for pine (tab. 3). The greater the species diversity of a forest district (determined according to Simpson’s index of diversity), the greater was the average difference in the estimated share of an individual species (figs. 1 and 2). The method of determining the species structure in a forest district used in forest management practice nowadays was considered insufficient. It was proposed to establish it in larger units (subclass, age class, forest district) only according to the volume of trees measured on the sample plots (without rounding and ‘switching’ of species), using the stratified sampling method.
    Źródło:
    Sylwan; 2019, 163, 05; 365-372
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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