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    Wyświetlanie 1-4 z 4
    Tytuł:
    Model przekroju podłużnego strzały modrzewia
    Taper model for European larch
    Autorzy:
    Bruchwald, A.
    Dmyterko, E.
    Wojtan, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1009010.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    dendrometria
    drzewa lesne
    modrzew
    Larix
    model przekroju podluznego strzaly
    wzory empiryczne
    taper model
    european larch
    15 equal sections formula
    Opis:
    A model for volume shares of 15 stem sections of the same relative length was developed on the basis of empirical material consisting of 615 larches. The volume share for each section is described by a general equation [2] taking into consideration the diameter at breast height and height of a tree. The parameters of the equation are presented in the table. With the empirical formula for the dbh form factor of the larch stem under bark [4], the volume of a tree can be determined using formula [3]. This enables building a taper model, thus determining the thickness in the middle of each of 15 sections and, by way of linear interpolation, the thickness in any place within the stem. The model allows to calculate the volume of any part of the larch stem.
    Źródło:
    Sylwan; 2010, 154, 11; 750-754
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Klasyfikacja ekotypowa samców sarny europejskiej (Capreolus capreolus L.) na podstawie wybranych pomiarów ich ciała
    Ecotype classification of the European roe deer [Capreolus capreolus L.] males on the basis of selected body parameters
    Autorzy:
    Kulak, D.
    Wajdzik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1011776.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    samce
    pomiary zoometryczne
    zwierzeta lowne
    lowiectwo
    sarna polna
    ekotypy
    Capreolus capreolus
    lesnictwo
    kozly
    sarna
    sarna lesna
    european roe deer
    field ecotype
    forest ecotype
    regression model
    neural network
    Opis:
    The studies were carried out on the European roe deer (Capreolus capreolus L.) males from field and forest ecotypes harvested in the Opole Region. Attempts were made to identify the ecotype of the examined individuals on the basis of skull and body measurements. It was found that the most useful measurements for ecotype identification are skull dimensions: LTO (profile length), LCB (condylobasal length), LBA (basal length), LV (length between the front edge of the occipital foramen and the end of the jawbone), LHM (mandible length) and MG (body weight). 82% of individuals were correctly classified using the regression analysis method, while the use of the neural network resulted in correctness ranging from 90 to 98% depending on the type of the network applied.
    Źródło:
    Sylwan; 2009, 153, 08; 563-574
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model wzrostu modrzewia europejskiego (Larix decidua Mill.)
    Growth model for European larch [Larix decidua Mill.]
    Autorzy:
    Bruchwald, A.
    Zasada, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1009318.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    dendrometria
    drzewa lesne
    modrzew europejski
    Larix decidua
    modele wzrostu
    modele stochastyczne
    drzewostany modrzewiowe
    struktura drzewostanu
    produkcyjnosc lasu
    growth and yield model
    european larch
    forest productivity
    stand structure
    Opis:
    The paper discusses the functioning scheme and components of the stochastic growth model for European larch. The model was presented in the form suitable for processing the periodic forest inventory data (diameter and height of trees measured on fixed sample plots and average stand age). The growth model for larch consists of four main algorithms: introductory, thinning, mortality and incremental. First, the introductory algorithm is run to determine stand characteristics at certain age. Next, the thinning algorithm linked with the mortality procedure is activated. In the next step, incremental algorithm (also coupled with mortality program) is turned on. Thinning and incremental programs are run alternately until the end of prognosis period is reached. One of the most important characteristics of forest stand structure is tree stocking utilized directly by the thinning algorithm. The presented model is suitable for prognosis of European larch stands with any age, site index, stocking and various results of measured diameters and heights. It requires verification based on independent empirical data, preferably from permanent research plots.
    Źródło:
    Sylwan; 2010, 154, 09; 615-624
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prognoza rozwoju drzewostanów lasu naturalnego z wykorzystaniem modelu według klas wymiarów
    Forecast of the development of natural forest resources using a size-class growth model
    Autorzy:
    Gazda, A.
    Miscicki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/972934.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany
    buk zwyczajny
    Fagus sylvatica
    Abies alba
    modele wzrostu
    las naturalny
    prognozowanie rozwoju
    Roztocze
    leśnictwo
    Bukowa Góra
    jodła pospolita
    model wzrostu według klas wymiarów
    silver fir
    increment
    mortality
    Roztoczański National Park
    European beech
    Opis:
    The size−class growth model is an empirical model applicable for the prediction of the dynamics of natural forest growth. It is based on the following assumptions: (1) changes in the forest condition are determined on the basis of the sum of the changes that take place in individual size classes, (2) the trees in a given class are represented by single average tree, (3) the calculation of the future tree density distribution in size classes (fig. 1) is the main element of the prediction, and (4) the future tree density distribution is estimated on the basis of the initial structure, actual growth and mortality of trees in individual size classes. The aim of the research was to develop a size−class growth model to be used for the preparation of a medium−term forecast of natural forest dynamics. The study site is located on the Bukowa Góra Mt in the Roztoczański National Park (SE Poland). For the analyses we took all uneven−aged stands (128 ha in total) composed mostly of silver fir and European beech. The material was collected on 65 permanent sample plots every five years in the period 1991−2011. Trees with the breast height diameter (DBH)8 cm were measured on each sample plot (500 m2), while smaller trees – on three smaller concentric plots. We calculated, separately for fir and beech, the relationship between the mortality of trees and their diameter (fig. 2), the relationship between the diameter increment of trees and their DBH (figs. 3−4), the rate of saplings (h=0.3−1.3 m) growth into the first DBH class (DBH=0.1−1.9 cm). On the basis of these data, we elaborated a size−class growth model that we used to predict the development of timber resources (trees with DBH 8 cm) at 10−year intervals in the period 2001− −2041. In 2011, the predicted average standing volume was lower than the one actually measured. The forecast indicated an increase in the average standing volume (fig. 5), a reduction in the volume of ingrowth (fig. 6), an increase in the proportion of beech in the standing volume and ingrowth (figs. 5 and 7) and the maintenance of a similar density structure (fig. 8) throughout the period 2001−2041. The low accuracy of the prediction after 10 years (in 2011) was caused by the difference between the predicted and actual values of tree growth and mortality in the period 2001−2011.
    Źródło:
    Sylwan; 2016, 160, 03; 207-218
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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