Development of Douglas fir merchantable stem volume model in the conditions of the Czech Republic
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F23%3A43924508" target="_blank" >RIV/62156489:43410/23:43924508 - isvavai.cz</a>
Výsledek na webu
<a href="https://doi.org/10.17221/92/2023-JFS" target="_blank" >https://doi.org/10.17221/92/2023-JFS</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.17221/92/2023-JFS" target="_blank" >10.17221/92/2023-JFS</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Development of Douglas fir merchantable stem volume model in the conditions of the Czech Republic
Popis výsledku v původním jazyce
A precise merchantable stem volume model of Douglas fir [Pseudotsuga menziesii (Mirb.) Franco] is missing in the Czech Republic. The aim of this study was to fit a new model through the reparametrization of volume equations (used in the Czech Republic or in other countries). We tested four volume equations (two from the Czech Republic, one from France and one from British Columbia) in the form of a nonlinear least squares model (NLS), weighted least squares model (WLS), and nonlinear mixed effects model (NLME). In all the tested models, the diameter at breast height of a tree and the total height of a tree were used as independent variables. Models were fitted on a dataset of 185 felled sample trees from eleven research areas with ages between 19-113 years. We have found that the model according to Omule et al. (1987) fits the merchantable stem volume as the best in the version of WLS model. Median value of the relative error of the final model was only -0.53%, which is less than the errors of models which are still used in the Czech Republic today.
Název v anglickém jazyce
Development of Douglas fir merchantable stem volume model in the conditions of the Czech Republic
Popis výsledku anglicky
A precise merchantable stem volume model of Douglas fir [Pseudotsuga menziesii (Mirb.) Franco] is missing in the Czech Republic. The aim of this study was to fit a new model through the reparametrization of volume equations (used in the Czech Republic or in other countries). We tested four volume equations (two from the Czech Republic, one from France and one from British Columbia) in the form of a nonlinear least squares model (NLS), weighted least squares model (WLS), and nonlinear mixed effects model (NLME). In all the tested models, the diameter at breast height of a tree and the total height of a tree were used as independent variables. Models were fitted on a dataset of 185 felled sample trees from eleven research areas with ages between 19-113 years. We have found that the model according to Omule et al. (1987) fits the merchantable stem volume as the best in the version of WLS model. Median value of the relative error of the final model was only -0.53%, which is less than the errors of models which are still used in the Czech Republic today.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
40102 - Forestry
Návaznosti výsledku
Projekt
—
Návaznosti
S - Specificky vyzkum na vysokych skolach
Ostatní
Rok uplatnění
2023
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Journal of Forest Science
ISSN
1212-4834
e-ISSN
1805-935X
Svazek periodika
69
Číslo periodika v rámci svazku
12
Stát vydavatele periodika
CZ - Česká republika
Počet stran výsledku
10
Strana od-do
515-524
Kód UT WoS článku
001125657400001
EID výsledku v databázi Scopus
—