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      Predicción de biomasa en plantaciones clonales de Tectona grandis L. f y Gmelina arborea Roxb. en Costa Rica Translated title: Biomass prediction in clonal plantations of Tectona grandis L. f y Gmelina arborea Roxb. in Costa Rica

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          Abstract

          Abstract El cambio climático es catalogado como el principal problema que enfrenta la humanidad, paralelo a ello se les reconoce a los ecosistemas forestales la función como sumidero de carbono. El objetivo del trabajo fue desarrollar modelos predictivos de biomasa por unidad de área (hectárea) para Tectona grandis y Gmelina arborea, establecidas en plantaciones comerciales a partir de material clonal. La biomasa para cada componente del árbol (hojas, ramas, raíz, fuste) se calculó mediante modelos alométricos desarrollados para ambas especies en estudios anteriores. La información para aplicar dichos modelos se obtuvo de bases de datos sobre mediciones de árboles en parcelas permanentes de muestreo y para cada parcela permanente se calculó la biomasa y el área basal, que luego fueron extrapolados a hectárea. Posteriormente se desarrollaron modelos agregados para la biomasa por hectárea de hojas, ramas, raíces, fuste, para la biomasa leñosa y biomasa total. Todos los modelos mostraron un ajuste (R2) superior al 85 %, con cifras de RCME y EMA inferiores 0,23 y con errores o sesgos de estimación inferior a 2,5 %. Los modelos elegidos se caracterizan por su robustez, precisión y practicidad para su uso, convirtiéndolos en una herramienta muy útil para la predicción de la biomasa.

          Translated abstract

          Resumen Actually, climate change is listed as the main problem facing humanity, parallel to this, forest ecosystems are recognized as carbon sinks. The objective of this work was to develop predictive models of biomass per unit area (hectare) for Tectona grandis and G. arborea arborea, established in commercial plantations from clonal material. The biomass of each component of the tree (leaves, branches, root, stem) was calculated using allometric models developed for both species. The information to apply those models was obtained from databases on tree measurements in permanent sampling plots and for each permanent plot, the biomass, and the basal área were calculated and then extrapolated to a hectare. Later, aggregate models were developed for the biomass per hectare of leaves, branches, roots, stems, for woody biomass and total biomass. All the models showed an adjustment (R2) greater than 85 %, with RCME and EMA values less than 0.23 and errors or estimation biases les than 2.5 %. The chosen models are characterized by their robustness, precision, and practicality of use, making them a very useful tool for predicting biomass.

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          Improved allometric models to estimate the aboveground biomass of tropical trees.

          Terrestrial carbon stock mapping is important for the successful implementation of climate change mitigation policies. Its accuracy depends on the availability of reliable allometric models to infer oven-dry aboveground biomass of trees from census data. The degree of uncertainty associated with previously published pantropical aboveground biomass allometries is large. We analyzed a global database of directly harvested trees at 58 sites, spanning a wide range of climatic conditions and vegetation types (4004 trees ≥ 5 cm trunk diameter). When trunk diameter, total tree height, and wood specific gravity were included in the aboveground biomass model as covariates, a single model was found to hold across tropical vegetation types, with no detectable effect of region or environmental factors. The mean percent bias and variance of this model was only slightly higher than that of locally fitted models. Wood specific gravity was an important predictor of aboveground biomass, especially when including a much broader range of vegetation types than previous studies. The generic tree diameter-height relationship depended linearly on a bioclimatic stress variable E, which compounds indices of temperature variability, precipitation variability, and drought intensity. For cases in which total tree height is unavailable for aboveground biomass estimation, a pantropical model incorporating wood density, trunk diameter, and the variable E outperformed previously published models without height. However, to minimize bias, the development of locally derived diameter-height relationships is advised whenever possible. Both new allometric models should contribute to improve the accuracy of biomass assessment protocols in tropical vegetation types, and to advancing our understanding of architectural and evolutionary constraints on woody plant development. © 2014 John Wiley & Sons Ltd.
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            Carbon sequestration in tropical agroforestry systems

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                Author and article information

                Journal
                kuru
                Revista Forestal Mesoamericana Kurú
                Kurú
                Instituto Tecnológico de Costa Rica (Cartago, Costa Rica, Cartago, Costa Rica )
                2215-2504
                June 2022
                : 19
                : 44
                : 66-74
                Affiliations
                [3] orgnameNovel Teak Costa Rica victor.arce@ 123456novelteak.com
                [1] Heredia Heredia orgnameUniversidad Nacional orgdiv1Instituto de Investigación y Servicios Forestales-Escuela de Ciencias Ambientales Costa Rica wfonseca@ 123456una.cr
                [2] orgnameUniversidad Nacional orgdiv1Escuela de Ciencias Ambientales Costa Rica rodrigo.benavides.fallas@ 123456gmail.com
                [4] orgnameEthical Forestry EFCR S.A orgdiv1Departamento de Investigación Costa Rica randall.carmona@ 123456ethicalforestry.com
                Article
                S2215-25042022000100066 S2215-2504(22)01904400066
                10.18845/rfmk.v19i44.6104
                6743d330-ba5c-493c-a00b-d4818d8b6b15

                This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

                History
                : 25 October 2021
                : 29 October 2020
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 39, Pages: 9
                Product

                SciELO Costa Rica

                Self URI: Texto completo solamente en formato PDF (ES)
                Categories
                Artículo

                Propagação vegetativa,componentes del árbol,modelos,teca,melina,Carbono,Floresta Ombrófila Mista,regulador vegetal

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