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    Wyświetlanie 1-6 z 6
    Tytuł:
    Analiza dokładności obrębowej metody inwentaryzacji lasu opartej na losowaniu warstwowym
    The accuracy of a novel forest inventory method based on stratified sampling
    Autorzy:
    Bruchwald, A.
    Wójcik, R.
    Zajączkowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1026758.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    losowanie warstwowe
    lesnictwo
    inwentaryzacja lasu
    urzadzanie lasu
    dokladnosc
    metoda obrebowa
    alder
    form factor
    empirical equation
    Opis:
    The paper provides an analysis of the accuracy of a novel forest inventory method for calculating stand volume based on stratified sampling. The analysis included stand age as an efficient element used in the construction of the strata, as well as assessment results of various methods of sample allocation. This novel inventory method was compared with the methods based on simple random sampling or systematic sampling. The theory of all analysed methods for calculating stand volume is based on the mathematical statistics called a „representative sampling method”.
    Źródło:
    Sylwan; 2003, 147, 05; 13-20
    0039-7660
    Pojawia się w:
    Sylwan
    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:
    Ocena dokładności określenia zasobności drzewostanów w obrębowej metodzie inwentaryzacji zapasu
    Accuracy assessment of stand volume determination in district inventory method
    Autorzy:
    Nowakowska, J.
    Wójcik, R.
    Sierdziński, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1009395.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    urzadzanie lasu
    drzewostany
    zasobnosc drzewostanu
    zapas drewna
    inwentaryzacja lasu
    metoda obrebowa
    miazszosc drzew
    cechy taksacyjne
    dokladnosc pomiaru
    district inventory method
    volume
    inventory features
    Opis:
    The research revealed an increase in accuracy of stand volume determination at induvidual stand and groups of stands level. Errors appeared in determination of such features as stand quality class, average diameter breast high of stand, average height and stocking index.
    Źródło:
    Sylwan; 2010, 154, 08; 535-544
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza wielkości miąższości uzyskanej z inwentaryzacji zapasu metodą obrębową w zależności od różnych wariantów obliczeń
    Analysis of standing volume assessment as conducted in the course of forest stand inventory with use of the Forest Division method depending on applied calculation variants
    Autorzy:
    Borecki, T.
    Pieniak, D.
    Wójcik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/972920.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    program ACER
    drzewostany
    program TAKSATOR
    zapas drzewostanu
    metody obliczeń
    inwentaryzacja drzewostanów
    leśnictwo
    metoda obrębowa
    miąższość drzewostanów
    standing volume assessment
    forest division based method
    quality control inspection
    Opis:
    In the present paper analyzed are results of standing volume assessment as dependent on the method of calculation applied; the calculations were done with utilization of algorithms used in the operational forestry: the TAKSATOR and the ACER packages. The results obtained show that the use of the forest division based TAKSATOR method leads to lower estimate as compared with the output of the quality control inspection assessment ACER.
    Źródło:
    Sylwan; 2006, 150, 11; 22-29
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dokładność określenia zasobności na poziomie warstw gatunkowo-wiekowych w obrębowej metodzie inwentaryzacji
    Accuracy of volume determination on the level of age-species layers in the stratified sampling method
    Autorzy:
    Banaś, J.
    Drozd, M.
    Bujoczek, L.
    Zięba, S.
    Zygmunt, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/986687.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    powierzchnie probne
    forest inventory
    stratification
    standard error
    sample plot
    variability coefficient
    lesnictwo
    drzewostany swierkowe
    warstwy gatunkowo-wiekowe
    inwentaryzacja lasu
    zasobnosc drzewostanu
    miazszosc drzewostanow
    metoda obrebowa
    dokladnosc pomiaru
    Opis:
    Statistical representative method of inventory based on stratified sampling is used for elaborate forest management plans in Poland. Strata are created according to the dominant tree species and age of stands. First stratum include stands with age from 21 to 30 years and the interval in the next strata is 10 years. Sample plot size depends on stand age and varies from 0.005 to 0.05 ha. According to the allocation pattern number of samples is proportional to age and total area of stands in a stratum. Diversification of number and size of sample plots has a profound influence of inventory precision in an age classes. The aim of the study is to analyse the accuracy of the stand volume determination on the level of age−species strata. Research was conducted based on the data obtained from periodic forest inventory in seven mountainous forest subdistricts located in the Kłodzko Basin (SW Poland). Norway spruce stands with total area of 39,935.45 ha and 6102 sample plots were chosen for analysis. Sampling fraction, mean number and volume of trees on a sample plot, coefficient of volume variability and standard error of volume were calculated for each stratum in analyzed forest subdistricts. Sample plots with size of 0.005 ha established in young stands (21−30 years) are characterized by small number of trees (4.3−7.6 in average) and the highest coefficient of volume variability (93%). Additionally, because of low age of stands, the number of plots is also small (18 on average), which influences the low precision of volume inventory in this stratum. Standard error of volume was on the mean level of 23% in the youngest age stratum and decreased with age of stands to 5% in the stands of 41−71 years and below this level in the strata with the older stands. Increasing the plot size in the youngest stratum will be effective way to improve accuracy of forest inventory in the method based on stratified sampling.
    Źródło:
    Sylwan; 2017, 161, 09; 715-722
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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