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Markedly divergent estimates of Amazon forest carbon density from ground plots and satellites

Research output: Contribution to journalArticle

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Author(s)

Edward T. A. Mitchard, Ted R. Feldpausch, Roel J. W. Brienen, Gabriela Lopez-Gonzalez, Abel Monteagudo, Timothy R. Baker, Simon L. Lewis, Jon Lloyd, Carlos A. Quesada, Manuel Gloor, Hans ter Steege, Patrick Meir, Esteban Alvarez, Alejandro Araujo-Murakami, Luiz E. O. C. Aragao, Luzmila Arroyo, Gerardo Aymard, Olaf Banki, Damien Bonal, Sandra Brown & 59 others Foster I. Brown, Carlos E. Ceron, Victor Chama Moscoso, Jerome Chave, James A. Comiskey, Fernando Cornejo, Massiel Corrales Medina, Lola Da Costa, Flavia R. C. Costa, Anthony Di Fiore, Tomas F. Domingues, Terry L. Erwin, Todd Frederickson, Niro Higuchi, Euridice N. Honorio Coronado, Tim J. Killeen, William F. Laurance, Carolina Levis, William E. Magnusson, Beatriz S. Marimon, Ben Hur Marimon Junior, Irina Mendoza Polo, Piyush Mishra, Marcelo T. Nascimento, David Neill, Mario P. Nunez Vargas, Walter A. Palacios, Alexander Parada, Guido Pardo Molina, Marielos Pena-Claros, Nigel Pitman, Carlos A. Peres, Lourens Poorter, Adriana Prieto, Hirma Ramirez-Angulo, Zorayda Restrepo Correa, Anand Roopsind, Katherine H. Roucoux, Agustin Rudas, Rafael P. Salomao, Juliana Schietti, Marcos Silveira, Priscila F. de Souza, Marc K. Steininger, Juliana Stropp, John Terborgh, Raquel Thomas, Marisol Toledo, Armando Torres-Lezama, Tinde R. van Andel, Geertje M. F. van der Heijden, Ima C. G. Vieira, Simone Vieira, Emilio Vilanova-Torre, Vincent A. Vos, Ophelia Wang, Charles E. Zartman, Yadvinder Malhi, Oliver L. Phillips

Abstract

Aim The accurate mapping of forest carbon stocks is essential for understanding the global carbon cycle, for assessing emissions from deforestation, and for rational land-use planning. Remote sensing (RS) is currently the key tool for this purpose, but RS does not estimate vegetation biomass directly, and thus may miss significant spatial variations in forest structure. We test the stated accuracy of pantropical carbon maps using a large independent field dataset.

Location Tropical forests of the Amazon basin. The permanent archive of the field plot data can be accessed at: http://dx.doi.org/10.5521/FORESTPLOTS.NET/2014_1

Methods Two recent pantropical RS maps of vegetation carbon are compared to a unique ground-plot dataset, involving tree measurements in 413 large inventory plots located in nine countries. The RS maps were compared directly to field plots, and kriging of the field data was used to allow area-based comparisons.

Results The two RS carbon maps fail to capture the main gradient in Amazon forest carbon detected using 413 ground plots, from the densely wooded tall forests of the north-east, to the light-wooded, shorter forests of the south-west. The differences between plots and RS maps far exceed the uncertainties given in these studies, with whole regions over-or under-estimated by > 25%, whereas regional uncertainties for the maps were reported to be <5%.

Main conclusions Pantropical biomass maps are widely used by governments and by projects aiming to reduce deforestation using carbon offsets, but may have significant regional biases. Carbon-mapping techniques must be revised to account for the known ecological variation in tree wood density and allometry to create maps suitable for carbon accounting. The use of single relationships between tree canopy height and above-ground biomass inevitably yields large, spatially correlated errors. This presents a significant challenge to both the forest conservation and remote sensing communities, because neither wood density nor species assemblages can be reliably mapped from space.

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Original languageEnglish
Pages (from-to)935-946
Number of pages12
JournalGlobal Ecology and Biogeography
Volume23
Issue number8
DOIs
Publication statusPublished - Aug 2014

    Research areas

  • Above-ground biomass, allometry, carbon cycle, REDD, remote sensing, satellite mapping, wood density, ABOVEGROUND LIVE BIOMASS, STOCKS, DEFORESTATION, EMISSIONS, ALLOMETRY, PATTERNS, BASIN, SOILS

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ID: 197494223