Improving aboveground biomass estimates by taking into account density variations between tree components
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Improving aboveground biomass estimates by taking into account density variations between tree components Antoine Billard1
´ eric ´ Mothe1 · Mathieu Jonard2 · Francis Colin1 · Fleur Longuetaud1 · Rodolphe Bauer1 · Fred
Received: 21 April 2020 / Accepted: 8 September 2020 © INRAE and Springer-Verlag France SAS, part of Springer Nature 2020
Abstract • Key message Strong density differences were observed between stem wood at 1.30 m and other tree components (stem wood, stem bark, knots, branch stumps and branches). The difference, up to 40% depending on the component, should be taken into account when estimating the biomass available for industrial uses, mainly fuelwood and wood for chemistry. • Context Basic density is a major variable in the calculation of tree biomass. However, it is usually measured on stem wood only and at breast height. • Aims The objectives of this study were to compare basic density of stem wood at 1.30 m with other tree components and assess the impact of differences on biomass. • Methods Three softwood species were studied: Abies alba Mill., Picea abies (L.) H. Karst., Pseudotsuga menziesii (Mirb.) Franco. X-Ray computed tomography was used to measure density. • Results Large differences were observed between components. Basic density of components was little influenced by tree size and stand density. Overall, bark, knot and branch biomasses were highly underestimated by using basic density measured at 1.30 m. • Conclusion Using available wood density databases mainly based on breast height measurements would lead to important biases (up to more than 40%) on biomass estimates for some tree components. Further work is necessary to complete available databases. Keywords Wood specific gravity · Bark · Knots · Branches · Softwoods Handling Editor: Leo Liu Contribution of the co-authors Antoine BILLARD: collected the data, performed the data analysis, wrote the original draft of this paper and was the main writer. Rodolphe BAUER: helped with the data collection and the validation of the knot volume measurements and contributed to the review and editing. Fr´ed´eric MOTHE: designed the experiment, helped with the data collection and data analysis and contributed to the writing. Mathieu JONARD: helped with the data analysis and contributed to the discussion, review and editing. Francis COLIN: participated to the funding acquisition, supervised the work, designed the experiment, coordinated the ExtraFor Est project, helped with the data collection and contributed to the discussion, review and editing. Fleur LONGUETAUD: participated to the funding acquisition, supervised the work, designed the experiment, helped with data collection and data analysis, and contributed to the writing. Antoine Billard
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1 Introduction This work focuses on the estimation of tree aboveground woody biomass, by detailing the different tree components, on the basis of volume data that are widely available from
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