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    Wyświetlanie 1-2 z 2
    Tytuł:
    Ekonomiczny wiek rębności drzewostanów sosnowych
    Economic rotation age of Scots pine stands
    Autorzy:
    Piekutin, J.
    Skręta, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1008788.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    gospodarka lesna
    drzewostany sosnowe
    wiek rebnosci
    ekonomiczny wiek rebnosci
    economic rotation age
    value of forest stand
    Opis:
    The determination of the best rotation age for trees and forest stands is one of the most decisive problems in forestry. It results from different aims of forest management. There are many criteria of selecting the product of forest utilization and deciding about stand maturity. They can be divided into biological, technical and economical ones. The most common are usually based on the rules of forest management. Different rotation age for the stand, dependent on various factors, always influences economical balance between bore costs and achieved income. Article presents the method of defining the economical rotation age based on the maximization of the income.
    Źródło:
    Sylwan; 2012, 156, 10; 741-749
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wiek rębności w lesie normalnym oraz lesie celowym
    Rotation age in normal and target forests
    Autorzy:
    Klocek, A.
    Piekutin, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/973332.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    model lasu celowego
    model lasu normalnego
    drzewostany
    proces ubywania
    proces przezywania
    leśnictwo
    wiek rębności
    deterministic model of normal forest
    probabilistic model of target forest
    survival and mortality processes
    Opis:
    The paper focuses on the deterministic model of normal forest, the probabilistic model of target forest and the processes related to the survival and mortality of forest stands suitable for these models. They are the basis for the assumptions, presented in this paper, of two different methods of regulating rotation age adequate for normal forest and target forest. Optimizing the rotation age of a stand is essential for the regulation of forest production. It aims to establish such an age−dependent state of stand, which is the most desirable from the point of view of the adopted forest management objectives. Because of the long−term cycle of stand development, optimizing the age at which a stand is considered mature for felling usually means maximizing the average annual increase in stand volume. Under the conditions of normal forest, the concept formulated in the first half of the nineteenth century, the above optimization criterion has the form of the equation [2]. The current annual increase of timber production (Pb (tu)) at the optimal rotationage (tu) is equal to the average annual increment (Pp(tu)). At this age, the intensity (rate) of thecurrent growth of the production function (Pb(tu)/P(tu)) becomes equal to the fractionof the stand area (1/tu). These relationships are illustrated in figure 3. The model of target forest is derived from the random nature of two opposing processes described as 'survival' and 'mortality' of forests. This is reflected in the transition probability matrix where a forest stand moves from the younger age class to the older or to the youngest age class. The probability function (U(t)) of stand survival in individual management periods (t) developed on the basis of these data, is one of the main parameters of the optimization equation for the rotation age of target forest [11]. Formula [13] indicates that the optimal rotation age (t=tu) is when the rate of growth in the volume of merchantable timber (Pb(t)/P(t)) and the negative growth rate (decline) for a part or the entirestand (Ub(t)/U(t)) are equal to a fraction of the stand area. These interactions are illustrated infigure 8, which additionally presents the effect of the decline in the survival rate on the optimal rotation age (tu). This age may be analyzed separately for natural disasters and for clear−cuttingof stands in accordance with the forest management plan. These two categories of effects mayalso be dealt with jointly.
    Źródło:
    Sylwan; 2015, 159, 12; 971-988
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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