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Wyszukujesz frazę "current volume increment" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Realizacja użytkowania przedrębnego w Lasach Państwowych w okresie 1999-2004
    Intermediate harvest realised in the State Forests in the period 1999-2004
    Autorzy:
    Borecki, T.
    Pieniak, D.
    Wójcik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1006340.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Panstwowe Gospodarstwo Lesne Lasy Panstwowe
    uzytkowanie lasu
    uzytkowanie przedrebne
    regulacja uzytkowania przedrebnego
    intermediate harvest
    regulation
    expected current volume increment
    Opis:
    Focus of the study was on the economic importance of intermediate harvest regulation. Analysis of the research material concerned mainly the ratio of the intermediate harvest to the expected 50% ten−year current volume increment. Study was realised in Scots pine stands in 337 forest districts all over Poland.
    Źródło:
    Sylwan; 2012, 156, 11; 848-854
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zależność wybranych cech drzewostanów od położenia nad poziomem morza na przykładzie Parku Narodowego Gór Stołowych
    Dependence of selected stand characteristics on the elevation on the example of the Stolowe Mountains National Park
    Autorzy:
    Miścicki, S.
    Szneidrowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/989003.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    lasy gorskie
    Park Narodowy Gor Stolowych
    dynamika drzewostanu
    miazszosc drzew
    miazszosc drewna
    zasobnosc drzewostanu
    zageszczenie drzew
    przyrost miazszosci
    czynniki siedliska
    wysokosc nad poziomem morza
    current volume increment
    elevation zone
    forest renewal
    net changes in standing volume
    tree density
    Opis:
    The elevation is used to illustrate the differences in the structure and growth of mountain forests. The aim of the study was to determine (1) whether the characteristics used to describe the condition and structure of forest stands under protection status (volume of merchantable timber, tree density, total height of trees in the regeneration layer, volume of dead stems, current annual volume increment, volume of dead trees, periodic changes in standing volume) change at the same rate along with the elevation, and (2) whether in mountains without upper montane zone, the values of the selected characteristics of stands located in the highest elevation zone decrease at a low rate with elevation and are comparable to the stands at the same elevation in higher mountains ranges. The study was located at an elevation of 400−909 m a.s.l. in the Stołowe Mountains National Park (PNGS; SW Poland). We used data from the measurements performed in 2009 and 2014 on 358 permanent sample plots. Plots were assigned to one of five elevation zones of 100 m a.s.l. We assumed that the characteristic value decreased with the increase in the elevation, and that such change was the same for all stand characteristics. This hypothesis was verified using the ANOVA for the repeated samples. The calculations were based on standardized values of the characteristics measured on individual sample plots. The higher above sea level the plot was located, the greater share of spruce in the stand (fig. 1). The standing volume (fig. 2), trees density (fig. 3) and current annual volume increment (fig. 6) decreased with elevation, while the volume of dead stems (fig. 4) increased. The net changes in standing volume (fig. 8) were the smallest in the stands located at the lowest and at the highest zone (400−499 and 800−909 m a.s.l.). No significant relationship was found between the total height of trees in the regeneration layer (fig. 5) or the volume of dead trees in the period 2009−2014 (fig. 7) and the elevation. Individual characteristics differed in the rate of changes of their values with elevation (fig. 9). The structure of stands growing at the highest elevation was the most variable. These stands were rather a substitute for the upper montane zone forests. The rate of the observed decrease of the volume of merchantable timber, tree density and current volume increment in the stands of PNGS was higher than in other forests in the Polish mountains.
    Źródło:
    Sylwan; 2017, 161, 02; 131-141
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pomiar zasobów leśnych z wykorzystaniem stałych koncentrycznych powierzchni próbnych - problemy i próby rozwiązań
    Measurement of forest resources using permanent concentric sample plots - problems and attempts at their solving
    Autorzy:
    Miścicki, S.
    Nowicka, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1015716.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    powierzchnie probne brzegowe
    powierzchnie probne koncentryczne
    lasy
    obliczenia
    stale powierzchnie obserwacyjne
    zasoby lesne
    lesnictwo
    permanent sample plots
    concentric plots
    edge plots
    successive measurements
    ingrowth
    overgrowth
    current periodic volume increment
    Opis:
    The conditions of using concentric sample plots in a successive inventory were researched. New definitions of ‘ingrowth' and ‘overgrowth' were introduced. As there is a possibility that sample plots could be located at stand edges, a new method POW_K of converting data from concentric plots was developed. The calculation results using this method were compared with the results obtained by the traditional method WSP. Two variants of obtaining inventory results for the whole forest district were taken into consideration – with and without stratification. Due to the value of mean errors of assessment of significant characteristics – volume and current periodic volume increment – the WSP method turned to be better – particularly in the variant with stratification. However, this method cannot be applied for utilizing the results of measurements of edge plots.
    Źródło:
    Sylwan; 2007, 151, 08; 15-26
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aktualizacja zapasu drzewostanów na podstawie danych z SILP i stałych kontrolnych powierzchni próbnych
    Updating of stands timber volume on the basis of the data from State Forest IT system [SILP] and permanent control sample plots
    Autorzy:
    Miścicki, S.
    Nowicka, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1013391.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    przyrost miazszosci
    aktualizacja
    lesnictwo
    powierzchnie probne
    uzytkowanie rebne
    System Informatyczny Lasow Panstwowych
    zapas drzewostanu
    silp
    permanent sample plots
    growing stock
    update
    utilization
    current periodical volume increment
    bayesian estimation
    Opis:
    The results of measurements of permanent control sample plots (skpp) were used to update the growing stock of individual stands in the State Forests IT System (SILP). The calculation was based on Bayesian estimation. Several update methods were used differing in the principles of estimating the initial growing stock. The growing stock update results for the whole forest and individual age classes were similar for all the applied methods. The volume of the estimated increment and the recorded cuts in SILP was lower compared to the measurement results in skpp. In addition to the periodical correction of the SILP data, the application of skpp would enable reduction in the intervals between the growing stock inventories (to 20−30 years) performed on the basis of a relatively large number of temporary sample plots.
    Źródło:
    Sylwan; 2008, 152, 11; 26-39
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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