title: Markedly divergent estimates of Amazon forest carbon density from ground plots and satellites.
abstract: OBJECTIVE
  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.
  
  
  METHODS
  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%.
  
  
  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.
authors.affiliation: School of GeoSciences, University of Edinburgh Edinburgh, EH9 3JN, UK.
authors.forename: Edward T A
authors.initials: ET
authors.lastname: Mitchard
authors.affiliation: School of Geography, University of Leeds Leeds, LS2 9JT, UK ; Geography, College of Life and Environmental Sciences, University of Exeter Exeter, EX4 4RJ, UK.
authors.forename: Ted R
authors.initials: TR
authors.lastname: Feldpausch
authors.affiliation: School of Geography, University of Leeds Leeds, LS2 9JT, UK.
authors.forename: Roel J W
authors.initials: RJ
authors.lastname: Brienen
authors.affiliation: School of Geography, University of Leeds Leeds, LS2 9JT, UK.
authors.forename: Gabriela
authors.initials: G
authors.lastname: Lopez-Gonzalez
authors.affiliation: Jardín Botánico de Missouri Oxapampa, Peru.
authors.forename: Abel
authors.initials: A
authors.lastname: Monteagudo
authors.affiliation: School of Geography, University of Leeds Leeds, LS2 9JT, UK.
authors.forename: Timothy R
authors.initials: TR
authors.lastname: Baker
authors.affiliation: School of Geography, University of Leeds Leeds, LS2 9JT, UK ; Department of Geography, University College London UK.
authors.forename: Simon L
authors.initials: SL
authors.lastname: Lewis
authors.affiliation: Faculty of Natural Sciences, Department of Life Sciences, Imperial College London, UK.
authors.forename: Jon
authors.initials: J
authors.lastname: Lloyd
authors.affiliation: Instituto Nacional de Pesquisas da Amazônia Manaus, Brazil.
authors.forename: Carlos A
authors.initials: CA
authors.lastname: Quesada
authors.affiliation: School of Geography, University of Leeds Leeds, LS2 9JT, UK.
authors.forename: Manuel
authors.initials: M
authors.lastname: Gloor
authors.affiliation: Naturalis Biodiversity Center Leiden, the Netherlands ; Institute of Environmental Biology, Utrecht University Utrecht, the Netherlands.
authors.forename: Hans
authors.initials: H
authors.lastname: Ter Steege
authors.affiliation: School of GeoSciences, University of Edinburgh Edinburgh, EH9 3JN, UK ; Research School of Biology, Australian National University Canberra, ACT, 0200, Australia.
authors.forename: Patrick
authors.initials: P
authors.lastname: Meir
authors.affiliation: Jardín Botánico de Medellín, Grupo de Investigación en Servicios Ecosistémicos y Cambio Climático Medellin, Colombia.
authors.forename: Esteban
authors.initials: E
authors.lastname: Alvarez
authors.affiliation: Museo de Historia Natural Noel Kempff Mercado, Universidad Autónoma Gabriel René Moreno Casilla 2489, Av. Irala 565, Santa Cruz, Bolivia.
authors.forename: Alejandro
authors.initials: A
authors.lastname: Araujo-Murakami
authors.affiliation: Geography, College of Life and Environmental Sciences, University of Exeter Exeter, EX4 4RJ, UK ; Remote Sensing Division, National Institute for Space Research - INPE São José dos Campos, SP, Brazil.
authors.forename: Luiz E O C
authors.initials: LE
authors.lastname: Aragão
authors.affiliation: Museo de Historia Natural Noel Kempff Mercado, Universidad Autónoma Gabriel René Moreno Casilla 2489, Av. Irala 565, Santa Cruz, Bolivia.
authors.forename: Luzmila
authors.initials: L
authors.lastname: Arroyo
authors.affiliation: UNELLEZ-Guanare, Programa de Ciencias del Agro y el Mar, Herbario Universitario (PORT) Mesa de Cavacas, Estado Portuguesa, 3350, Venezuela.
authors.forename: Gerardo
authors.initials: G
authors.lastname: Aymard
authors.affiliation: IBED, University of Amsterdam POSTBUS 94248, 1090 GE, Amsterdam, the Netherlands.
authors.forename: Olaf
authors.initials: O
authors.lastname: Banki
authors.affiliation: L'Institut National de la Recherche Agronomique UMR 1137 EEF, 54280, Champenoux, France.
authors.forename: Damien
authors.initials: D
authors.lastname: Bonal
authors.affiliation: Ecosystem Services Unit, Winrock International Arlington, VA, 22202, USA.
authors.forename: Sandra
authors.initials: S
authors.lastname: Brown
authors.affiliation: Woods Hole Research Center Falmouth, MA, USA ; Universidade Federal do Acre, Centro de Ciências Biológicas e da Natureza Rio Branco, AC, 69910-900, Brazil.
authors.forename: Foster I
authors.initials: FI
authors.lastname: Brown
authors.affiliation: Herbario Alfredo Paredes (QAP), Universidad Central del Ecuador Quito, Ecuador.
authors.forename: Carlos E
authors.initials: CE
authors.lastname: Cerón
authors.affiliation: Jardín Botánico de Missouri Oxapampa, Peru.
authors.forename: Victor
authors.initials: V
authors.lastname: Chama Moscoso
authors.affiliation: Université Paul Sabatier, Laboratoire EDB bâtiment 4R3, 31062, Toulouse, France.
authors.forename: Jerome
authors.initials: J
authors.lastname: Chave
authors.affiliation: National Park Service Fredericksburg, VA, USA.
authors.forename: James A
authors.initials: JA
authors.lastname: Comiskey
authors.affiliation: Universidad Nacional Agraria La Molina, Facultad de Ciencias Forestales Lima, Peru.
authors.forename: Fernando
authors.initials: F
authors.lastname: Cornejo
authors.affiliation: Universidad Nacional de San Agustín de Arequipa Arequipa, Peru.
authors.forename: Massiel
authors.initials: M
authors.lastname: Corrales Medina
authors.affiliation: Geociencias, Universidade Federal de Para Belem, Brazil.
authors.forename: Lola
authors.initials: L
authors.lastname: Da Costa
authors.affiliation: Instituto Nacional de Pesquisas da Amazônia Manaus, Brazil.
authors.forename: Flavia R C
authors.initials: FR
authors.lastname: Costa
authors.affiliation: Univeristy of Texas Austin, TX, USA.
authors.forename: Anthony
authors.initials: A
authors.lastname: Di Fiore
authors.affiliation: FFCLRP-USP, Department of Biology, Universidade de São Paulo 05508-090, Brazil.
authors.forename: Tomas F
authors.initials: TF
authors.lastname: Domingues
authors.affiliation: Department of Entomology, Smithsonian Institution P.O. Box 37012, MRC 187, Washington, DC, 20013-7012, USA.
authors.forename: Terry L
authors.initials: TL
authors.lastname: Erwin
authors.affiliation: Ferrum College Ferum, Virginia, USA.
authors.forename: Todd
authors.initials: T
authors.lastname: Frederickson
authors.affiliation: Instituto Nacional de Pesquisas da Amazônia Manaus, Brazil.
authors.forename: Niro
authors.initials: N
authors.lastname: Higuchi
authors.affiliation: School of Geography, University of Leeds Leeds, LS2 9JT, UK ; Instituto de Investigaciones de la Amazonía Peruana Av. José A. Quiñones km. 2.5, Iquitos, Peru.
authors.forename: Euridice N
authors.initials: EN
authors.lastname: Honorio Coronado
authors.affiliation: World Wildlife Fund 1250 24th Street, N.W., Washington, DC, 20037, USA.
authors.forename: Tim J
authors.initials: TJ
authors.lastname: Killeen
authors.affiliation: Centre for Tropical Environmental and Sustainability Science (TESS), School of Marine and Tropical Biology, James Cook University Cairns, Queensland, 4878, Australia.
authors.forename: William F
authors.initials: WF
authors.lastname: Laurance
authors.affiliation: Instituto Nacional de Pesquisas da Amazônia Manaus, Brazil.
authors.forename: Carolina
authors.initials: C
authors.lastname: Levis
authors.affiliation: Instituto Nacional de Pesquisas da Amazônia Manaus, Brazil.
authors.forename: William E
authors.initials: WE
authors.lastname: Magnusson
authors.affiliation: Universidade do Estado de Mato Grosso, Campus de Nova Xavantina Caixa Postal 08, CEP 78.690-000, Nova Xavantina, MT, Brazil.
authors.forename: Beatriz S
authors.initials: BS
authors.lastname: Marimon
authors.affiliation: Universidade do Estado de Mato Grosso, Campus de Nova Xavantina Caixa Postal 08, CEP 78.690-000, Nova Xavantina, MT, Brazil.
authors.forename: Ben Hur
authors.initials: BH
authors.lastname: Marimon Junior
authors.affiliation: Jardín Botánico de Medellín, Grupo de Investigación en Servicios Ecosistémicos y Cambio Climático Medellin, Colombia.
authors.forename: Irina
authors.initials: I
authors.lastname: Mendoza Polo
authors.affiliation: Department of Civil Engineering, Indian Institute of Technology Roorkee, Uttarakhand, 247667, India.
authors.forename: Piyush
authors.initials: P
authors.lastname: Mishra
authors.affiliation: Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminese Campos dos Goytacazes, RJ, Brasil.
authors.forename: Marcelo T
authors.initials: MT
authors.lastname: Nascimento
authors.affiliation: Puyo, Universidad Estatal Amazónica Paso lateral km 2½ via a Napo, Pastaza, Ecuador.
authors.forename: David
authors.initials: D
authors.lastname: Neill
authors.affiliation: Universidad Nacional de San Antonio Abad del Cusco Cusco, Peru.
authors.forename: Mario P
authors.initials: MP
authors.lastname: Núñez Vargas
authors.affiliation: Escuela de Ingeniería Forestal, Universidad Técnica del Norte Ecuador.
authors.forename: Walter A
authors.initials: WA
authors.lastname: Palacios
authors.affiliation: Museo de Historia Natural Noel Kempff Mercado, Universidad Autónoma Gabriel René Moreno Casilla 2489, Av. Irala 565, Santa Cruz, Bolivia.
authors.forename: Alexander
authors.initials: A
authors.lastname: Parada
authors.affiliation: Universidad Autónoma del Beni Riberalta, Beni, Bolivia.
authors.forename: Guido
authors.initials: G
authors.lastname: Pardo Molina
authors.affiliation: Forest Ecology and Forest Management Group, Wageningen University P.O. Box 47, 6700 AA, Wageningen, the Netherlands ; Instituto Boliviano de Investigación Forestal Santa Cruz, Bolivia.
authors.forename: Marielos
authors.initials: M
authors.lastname: Peña-Claros
authors.affiliation: Center for Tropical Conservation, Duke University Box 90381, Durham, NC, 27708, USA.
authors.forename: Nigel
authors.initials: N
authors.lastname: Pitman
authors.affiliation: Centre for Biodiversity Research, School of Environmental Sciences, University of East Anglia Norwich, NR4 7JT, UK.
authors.forename: Carlos A
authors.initials: CA
authors.lastname: Peres
authors.affiliation: Forest Ecology and Forest Management Group, Wageningen University P.O. Box 47, 6700 AA, Wageningen, the Netherlands.
authors.forename: Lourens
authors.initials: L
authors.lastname: Poorter
authors.affiliation: Instituto de Ciencias Naturales, Universidad Nacional de Colombia Bogota, Colombia.
authors.forename: Adriana
authors.initials: A
authors.lastname: Prieto
authors.affiliation: Universidad de Los Andes Merida, Venezuela.
authors.forename: Hirma
authors.initials: H
authors.lastname: Ramirez-Angulo
authors.affiliation: Jardín Botánico de Medellín, Grupo de Investigación en Servicios Ecosistémicos y Cambio Climático Medellin, Colombia.
authors.forename: Zorayda
authors.initials: Z
authors.lastname: Restrepo Correa
authors.affiliation: Department of Biology, University of Florida P.O. 118526, 511 Bartram Hall, Gainesville, FL, 32611-8526, USA.
authors.forename: Anand
authors.initials: A
authors.lastname: Roopsind
authors.affiliation: School of Geography, University of Leeds Leeds, LS2 9JT, UK.
authors.forename: Katherine H
authors.initials: KH
authors.lastname: Roucoux
authors.affiliation: Universidad Nacional de Colombia Leticia, Colombia.
authors.forename: Agustin
authors.initials: A
authors.lastname: Rudas
authors.affiliation: Museu Paraense Emilio Goeldi Av. Magalhães Barata, 376, São Braz, 66040-170, Belém, PA, Brazil.
authors.forename: Rafael P
authors.initials: RP
authors.lastname: Salomão
authors.affiliation: Instituto Nacional de Pesquisas da Amazônia Manaus, Brazil.
authors.forename: Juliana
authors.initials: J
authors.lastname: Schietti
authors.affiliation: Universidade Federal do Acre, Centro de Ciências Biológicas e da Natureza Rio Branco, AC, 69910-900, Brazil.
authors.forename: Marcos
authors.initials: M
authors.lastname: Silveira
authors.affiliation: Instituto Nacional de Pesquisas da Amazônia Manaus, Brazil.
authors.forename: Priscila F
authors.initials: PF
authors.lastname: de Souza
authors.affiliation: Center for Applied Biodiversity Science, Conservation International Washington, DC, USA.
authors.forename: Marc K
authors.initials: MK
authors.lastname: Steininger
authors.affiliation: Institute for Environment and Sustainability, Joint Research Centre of the European Commission Via Enrico Fermi, 2748 TP 440, I-21027, Ispra, Italy.
authors.forename: Juliana
authors.initials: J
authors.lastname: Stropp
authors.affiliation: Nicholas School of the Environment, Duke University Box 90381, Durham, NC, 27708, USA.
authors.forename: John
authors.initials: J
authors.lastname: Terborgh
authors.affiliation: Iwokrama International Centre 77 High Street Kingston, Georgetown, Guyana.
authors.forename: Raquel
authors.initials: R
authors.lastname: Thomas
authors.affiliation: Instituto Boliviano de Investigación Forestal Santa Cruz, Bolivia ; Universidad Autónoma Gabriel René Moreno Santa Cruz, Bolivia.
authors.forename: Marisol
authors.initials: M
authors.lastname: Toledo
authors.affiliation: Universidad de Los Andes Merida, Venezuela.
authors.forename: Armando
authors.initials: A
authors.lastname: Torres-Lezama
authors.affiliation: Naturalis Biodiversity Center Leiden, the Netherlands.
authors.forename: Tinde R
authors.initials: TR
authors.lastname: van Andel
authors.affiliation: University of Wisconsin-Milwaukee P.O Box 413, Milwaukee, WI, 53201, USA ; Smithsonian Tropical Research Institute Apartado, Postal 0843-03092, Panamá, Panama.
authors.forename: Geertje M F
authors.initials: GM
authors.lastname: van der Heijden
authors.affiliation: Museu Paraense Emilio Goeldi Av. Magalhães Barata, 376, São Braz, 66040-170, Belém, PA, Brazil.
authors.forename: Ima C G
authors.initials: IC
authors.lastname: Vieira
authors.affiliation: Núcleo de Estudos e Pesquisas Ambientais, Universidade Estadual de Campinas Campinas, Brazil.
authors.forename: Simone
authors.initials: S
authors.lastname: Vieira
authors.affiliation: Universidad de Los Andes Merida, Venezuela.
authors.forename: Emilio
authors.initials: E
authors.lastname: Vilanova-Torre
authors.affiliation: Escuela de Ingeniería Forestal, Universidad Técnica del Norte Ecuador.
authors.forename: Vincent A
authors.initials: VA
authors.lastname: Vos
authors.affiliation: Lab of Landscape Ecology and Conservation Biology, Northern Arizona University Flagstaff, AZ, USA.
authors.forename: Ophelia
authors.initials: O
authors.lastname: Wang
authors.affiliation: Instituto Nacional de Pesquisas da Amazônia Manaus, Brazil.
authors.forename: Charles E
authors.initials: CE
authors.lastname: Zartman
authors.affiliation: School of Geography and the Environment, University of Oxford Oxford, UK.
authors.forename: Yadvinder
authors.initials: Y
authors.lastname: Malhi
authors.affiliation: School of Geography, University of Leeds Leeds, LS2 9JT, UK.
authors.forename: Oliver L
authors.initials: OL
authors.lastname: Phillips
keywords: Above-ground biomass; REDD+; allometry; carbon cycle; remote sensing; satellite mapping; wood density