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    Wyświetlanie 1-2 z 2
    Tytuł:
    Modelowanie grubości kory wzdłuż pnia za pomocą modeli zbieżystości
    Modelling the bark thickness along the trunk with taper models
    Autorzy:
    Bronisz, K.
    Gruchała, A.
    Zasada, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/980348.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    dendrometria
    robinia akacjowa
    Robinia pseudoacacia
    grubosc kory
    modelowanie
    model zbiezystosci
    bark thicknes
    taper models
    robinia pseudoacacia
    seemingly unrelated regression
    Opis:
    Taper models are used to determine the diameter along the trunk and allow to determine the tree trunk volume or volume of any part of it. The paper presents the method of determining the thickness of bark along the trunk using compatible taper models. Four taper models with different levels of complexity were analyzed based on data from 13 sample plots and 39 sample trees measured in black locust (Robinia pseudoacacia L.) stands from west Poland. For modelling the over and under bark diameter and bark thickness along the trunk seemingly unrelated regression of independent equations was applied. During the analyzes, the logical assumption that the thickness of the bark at any place on the trunk is determined in a difference of over and under bark diameter was applied. It was found that selected models fit the shape of the trunk with different accuracy. The worst results were obtained with the use of a polynomial model. The best fit for modelling bark thickness along the trunk was characterized by variable−form taper models. However, regardless of the complexity and quality of fit to the trunk shape, all analyzed models allowed determining the bark thickness along the trunk without systematic error and with practically acceptable accuracy.
    Źródło:
    Sylwan; 2019, 163, 06; 469-478
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelowanie cech drzew i drzewostanów z wykorzystaniem modeli efektów mieszanych
    Modeling of the tree and stand parameters using mixed-effects models
    Autorzy:
    Bronisz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/980258.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany
    drzewa lesne
    grubosc kory
    cechy dendrometryczne
    modelowanie
    modele liniowe
    modele efektow mieszanych
    bark thickness
    scots pine
    regression
    linear mixed−effects models
    Opis:
    Regression analysis is one of the most popular statistical modeling tools, which can define linear or nonlinear relationships between individual trees and stands parameters. Mixed−effects models are one of the contemporary trends of those regression methods. These models can be applied to describe such features as: height, biomass, taper, site index or volume both at the level of a single tree and whole forest ecosystems. The aim of this work is to present the characteristics of the mixed−effects model, the applicability of linear and nonlinear mixed−effects models in forest studies, and the example of a linear mixed−effects model defining the relationship between bark thickness and diameter at breast height for Scots pine (Pinus sylvestris L.) in comparison to the linear fixed−effect model. Goodness−of−fit for the obtained linear mixed−effect model indicate its better fit to the pine bark thickness than in the case of the mixed−effects model. Moreover, most of the published research results indicate the predominance of both linear and nonlinear mixed−effects models according to fixed−effect ones. These studies indicate the wide possibilities of using mixed−effect models in forestry. However, there are also results pointing to the disadvantages of these models and put into question the legitimacy of their use in forest research. This fact to some extent confirms the results (residuals behavior) obtained in this study. Therefore, it seems necessary to conduct further research, which on the one hand will allow the potential of this solution to be used, and on the other hand will help to clarify emerging doubts.
    Źródło:
    Sylwan; 2019, 163, 07; 564-575
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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