Equations of bark thickness and volume profiles at different heights with easy-measurement variables
The objective of this work was to develop equations of thickness profile and bark volume at different heights with easy-measurement variables, taking as a study case Nothofagus pumilio forests, growing in different site qualities and growth phases in Southern Patagonia. Data was collected from 717 h...
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| Format: | Artículo |
| Language: | Inglés |
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Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (España)
2022
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| Online Access: | http://hdl.handle.net/20.500.12123/11354 https://revistas.inia.es/index.php/fs/article/view/1963 https://doi.org/10.5424/fs/2112211-01963 |
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| author | Cellini, Juan Manuel Galarza, Martín Burns, Sarah Lilian Martinez Pastur, Guillermo José Lencinas, María Vanessa |
| author_browse | Burns, Sarah Lilian Cellini, Juan Manuel Galarza, Martín Lencinas, María Vanessa Martinez Pastur, Guillermo José |
| author_facet | Cellini, Juan Manuel Galarza, Martín Burns, Sarah Lilian Martinez Pastur, Guillermo José Lencinas, María Vanessa |
| author_sort | Cellini, Juan Manuel |
| collection | INTA Digital |
| description | The objective of this work was to develop equations of thickness profile and bark volume at different heights with easy-measurement variables, taking as a study case Nothofagus pumilio forests, growing in different site qualities and growth phases in Southern Patagonia. Data was collected from 717 harvested trees. Three models were fitted using multiple, non-lineal regression and generalized linear model, by stepwise methodology, iteratively reweighted least squares method for maximum likelihood estimation and Marquardt algorithm. The dependent variables were diameter at 1.30 m height (DBH), relative height (RH) and growth phase (GP). The statistic evaluation was made through the adjusted determinant coefficient (r2-adj), standard error of the estimation (SEE), mean absolute error and residual analysis. All models presented good fitness with a significant correlation with the growth phase. A decrease in the thickness was observed when the relative height increase. Moreover, a bark coefficient was made to calculate volume with and without bark of individual trees, where significant differences according to site quality of the stands and DBH class of the trees were observed. It can be concluded that the prediction of bark thickness and bark coefficient is possible using DBH, height, site quality and growth phase, common and easy measurement variables used in forest inventories. |
| format | Artículo |
| id | INTA11354 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| publisher | Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (España) |
| publisherStr | Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (España) |
| record_format | dspace |
| spelling | INTA113542022-03-09T14:56:32Z Equations of bark thickness and volume profiles at different heights with easy-measurement variables Cellini, Juan Manuel Galarza, Martín Burns, Sarah Lilian Martinez Pastur, Guillermo José Lencinas, María Vanessa Nothofagus Espesor Nothofagus pumilio Inventarios Forestales Análisis por Regresión Múltiple Medición Thickness Forest Inventories Multiple Regression Analysis Measurement The objective of this work was to develop equations of thickness profile and bark volume at different heights with easy-measurement variables, taking as a study case Nothofagus pumilio forests, growing in different site qualities and growth phases in Southern Patagonia. Data was collected from 717 harvested trees. Three models were fitted using multiple, non-lineal regression and generalized linear model, by stepwise methodology, iteratively reweighted least squares method for maximum likelihood estimation and Marquardt algorithm. The dependent variables were diameter at 1.30 m height (DBH), relative height (RH) and growth phase (GP). The statistic evaluation was made through the adjusted determinant coefficient (r2-adj), standard error of the estimation (SEE), mean absolute error and residual analysis. All models presented good fitness with a significant correlation with the growth phase. A decrease in the thickness was observed when the relative height increase. Moreover, a bark coefficient was made to calculate volume with and without bark of individual trees, where significant differences according to site quality of the stands and DBH class of the trees were observed. It can be concluded that the prediction of bark thickness and bark coefficient is possible using DBH, height, site quality and growth phase, common and easy measurement variables used in forest inventories. El objetivo de este trabajo fue desarrollar ecuaciones de perfil del grosor y el volumen de corteza para diferentes alturas utilizando variables de fácil medición, tomando como caso de estudio los bosques de Nothofagus pumilio, creciendo en un gradiente de calidades de sitio y fases de crecimiento en Patagonia Sur. Se tomaron datos de 717 árboles. Se ajustaron tres modelos utilizando regresión múltiple, no lineal, y modelo lineal generalizado, mediante la metodología paso a paso, el algoritmo de Marquardt y de máxima verosimilitud. Las variables dependientes fueron el diámetro a 1,30 m de altura (DAP), altura relativa y la fase de crecimiento. Todos los modelos presentaron buen ajuste con una correlación significativa con la fase de crecimiento. Se observó una disminución en el espesor de corteza con el aumento de la altura relativa. Por otra parte, se desarrolló un coeficiente de corteza para calcular el volumen sin corteza de árboles, en donde se observaron diferencias significativas con la calidad de sitio y clases de DAP de los árboles. La predicción del espesor de la corteza y el coeficiente de la corteza es posible utilizando el DAP, altura, calidad de sitio y la fase de crecimiento, variables de fácil medición en inventarios forestales. EEA Yuto Fil: Cellini, Juan Manuel. Universidad Nacional de la Plata. Facultad de Ciencias Naturales y Museo. Laboratorio de Investigaciones en Maderas; Argentina. Fil: Galarza, Martín. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Yuto. Agencia de Extensión Rural Tartagal; Argentina. Fil: Burns, Sarah Lilian. Universidad Nacional de la Plata. Facultad de Ciencias Naturales y Museo. Laboratorio de Investigaciones en Maderas; Argentina. Fil: Martínez Pastur, Guillermo José. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas (CADIC); Argentina. Fil: Lencinas, María Vanessa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas (CADIC); Argentina. 2022-03-09T14:45:53Z 2022-03-09T14:45:53Z 2012 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/11354 https://revistas.inia.es/index.php/fs/article/view/1963 2171-9845 2171-5068 https://doi.org/10.5424/fs/2112211-01963 eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (España) Forest Systems, 21 (1) : 23-30 (2012) |
| spellingShingle | Nothofagus Espesor Nothofagus pumilio Inventarios Forestales Análisis por Regresión Múltiple Medición Thickness Forest Inventories Multiple Regression Analysis Measurement Cellini, Juan Manuel Galarza, Martín Burns, Sarah Lilian Martinez Pastur, Guillermo José Lencinas, María Vanessa Equations of bark thickness and volume profiles at different heights with easy-measurement variables |
| title | Equations of bark thickness and volume profiles at different heights with easy-measurement variables |
| title_full | Equations of bark thickness and volume profiles at different heights with easy-measurement variables |
| title_fullStr | Equations of bark thickness and volume profiles at different heights with easy-measurement variables |
| title_full_unstemmed | Equations of bark thickness and volume profiles at different heights with easy-measurement variables |
| title_short | Equations of bark thickness and volume profiles at different heights with easy-measurement variables |
| title_sort | equations of bark thickness and volume profiles at different heights with easy measurement variables |
| topic | Nothofagus Espesor Nothofagus pumilio Inventarios Forestales Análisis por Regresión Múltiple Medición Thickness Forest Inventories Multiple Regression Analysis Measurement |
| url | http://hdl.handle.net/20.500.12123/11354 https://revistas.inia.es/index.php/fs/article/view/1963 https://doi.org/10.5424/fs/2112211-01963 |
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