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      MODELOS COMPATIBLES DE AHUSAMIENTO-VOLUMEN PARA ÁRBOLES DE Gmelina arborea Roxb. EN EL ALTO MAGDALENA, COLOMBIA Translated title: Compatible volume-taper models for Gmelina arborea Roxb. trees grown in the upper Magdalena basin, Colombia

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          Abstract

          Resumen La estimación precisa del volumen y el ahusamiento de los árboles es importante para el manejo eficiente de los recursos forestales. El objetivo principal del estudio fue generar un sistema de ecuaciones compatibles de ahusamiento-volumen para Gmelina arborea Roxb. Los datos corresponden a perfiles fustales de 97 árboles en edad de cosecha, con edades entre 13-18 años, cultivados en el Alto Magdalena, Colombia. Se evaluaron cuatro sistemas compatibles de ahusamiento-volumen en la predicción de diámetros fustales y volúmenes comerciales. Los sistemas de ecuaciones fueron ajustados simultáneamente para minimizar los errores en la estimación de parámetros y evaluados empleando medidas de bondad de ajuste y de predicción. Los modelos evaluados presentaron sesgos entre -0.07-0.92 cm y -0.0003-0.0009 m3 y errores promedio entre 1.62-2.76 cm y 0.019-0.021 m3 en la predicción de diámetros fustales y volúmenes comerciales, respectivamente. Finalmente, el sistema de ahusamiento-volumen seleccionado fue el propuesto por Fang.

          Translated abstract

          Abstract The accurate estimation of tree volume and taper is important for the efficient management of forest resources. The main objective of the study was to generate a compatible volume-taper equations system for Gmelina arborea Roxb. Data used in the study correspond to 97 trees at harvest age, between 13 and 18 years-old, grown in the upper Magdalena basin, Colombia. Four compatible volume-taper systems were evaluated for stem diameter and merchantable volume prediction. The equations systems were fitted simultaneously to minimize the errors during the parameter estimation and evaluated considering measures of fit goodness and prediction. The evaluated models showed bias in the range of -0.07-0.92 cm and -0.0003-0.0009 m3 and mean errors in the range of 1.62-2.76 cm and 0.019-0.021 m3 in stem diameters and merchantable volumes prediction, respectively. Finally, the selected volume-taper system was the one proposed by Fang.

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          Assessing Tree and Stand Biomass: A Review with Examples and Critical Comparisons

          There is considerable interest today in estimating the biomass of trees and forests for both practical forestry issues and scientific purposes. New techniques and procedures are brought together along with the more traditional approaches to estimating woody biomass. General model forms and weighted analysis are reviewed, along with statistics for evaluating and comparing biomass models. Additivity and harmonization are addressed, and weight-ratio and density-integral approaches are discussed. Subsampling methods on trees to derive unbiased weight estimates are examined, and ratio and difference sampling estimators are considered in detail. Error components for stand biomass estimates are examined. This paper reviews quantitative principles and gives specific examples for prediction of tree biomass. The examples should prove useful for understanding the principles involved and for instructional purposes. For. Sci. 45(4):573-593.
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            My last words on taper equations

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              Converting Volume Equations to Compatible Taper Equations

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                cofo
                Colombia Forestal
                Colomb. for.
                Proyecto Curricular de Ingeniería Forestal, Facultad del Medio Ambiente y Recursos Naturales, Universidad Distrital Francisco José de Caldas. (Bogotá, Distrito Capital, Colombia )
                0120-0739
                December 2018
                : 21
                : 2
                : 174-187
                Affiliations
                [2] Ibagué Tolima orgnameUniversidad del Tolima Colombia paramosm@ 123456ut.edu.co
                [4] Ibagué Tolima orgnameUniversidad del Tolima Colombia amlopeza@ 123456ut.edu.co
                [3] Ibagué Tolima orgnameUniversidad del Tolima Colombia abarriost@ 123456ut.edu.co.
                [1] Ibagué Tolima orgnameUniversidad del Tolima Colombia gsninol@ 123456ut.edu.co
                Article
                S0120-07392018000200174
                10.14483/2256201x.12249
                f66fb243-6db5-4c3a-8f29-2a7135fc4101

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

                History
                : 22 March 2018
                : 22 June 2017
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 42, Pages: 14
                Product

                SciELO Colombia


                conicidad,biometría forestal,diámetro fustal,volumen comercial.,forest biometrics,taper,stem diameter,merchantable volume.

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