Aboveground stand-level biomass estimation: a comparison of two methods for major forest species in northwest Spain |
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Authors: | Fernando Castedo-Dorado Esteban Gómez-García Ulises Diéguez-Aranda Marcos Barrio-Anta Felipe Crecente-Campo |
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Institution: | 1. Departamento de Ingenier??a y Ciencias Agrarias, Universidad de Le??n. Escuela Superior y T??cnica de Ingenier??a Agraria, Avda. de Astorga s/n, 24400, Ponferrada, Le??n, Spain 2. Departamento de Ingenier??a Agroforestal, Universidad de Santiago de Compostela. Escuela Polit??cnica Superior, R/ Benigno Ledo, Campus Universitario, 27002, Lugo, Spain 3. Departamento de Biolog??a de Organismos y Sistemas, Universidad de Oviedo. Escuela Polit??cnica de Mieres, C/Gonzalo Guti??rrez Quir??s, 33600, Mieres, Asturias, Spain
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Abstract: | Context The scaling-up approach (which requires the use of individual tree biomass equations and data) is one of the most commonly used methods for estimating stand biomass at a local scale. However, biomass prediction over large management areas requires more efficient methods. Aims Two methods of estimating aboveground stand biomass were developed and compared: stand biomass equations (SBE) including observed stand variables, and SBE including biomass expansion factors (BEF) and stand volume. Methods Two types of systems of additive equations were fitted simultaneously for components and total aboveground stand biomass, to ensure additivity. Inherent correlations among biomass components were also taken into account in the fitting process. Results The systems explained a high percentage of the observed variability. The SBE systems that included observed stand variables provided more accurate estimates than those that included BEF and stand volume. However, the latter were found to be more precise for stem wood and total aboveground biomass prediction. Conclusions Both approaches provide a direct link between forest inventory data, outputs from whole-stand growth models, and biomass estimates at stand level. Taking into account that the inventory effort is similar for both alternatives, the choice of which to use will depend on the data available and on the relative importance of the biomass components for the end-users. |
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