title: Evaluating the convergence between eddy-covariance and biometric methods for assessing carbon budgets of forests.
abstract: The eddy-covariance (EC) micro-meteorological technique and the ecology-based biometric methods (BM) are the primary methodologies to quantify CO2exchange between terrestrial ecosystems and the atmosphere (net ecosystem production, NEP) and its two components, ecosystem respiration and gross primary production. Here we show that EC and BM provide different estimates of NEP, but comparable ecosystem respiration and gross primary production for forest ecosystems globally. Discrepancies between methods are not related to environmental or stand variables, but are consistently more pronounced for boreal forests where carbon fluxes are smaller. BM estimates are prone to underestimation of net primary production and overestimation of leaf respiration. EC biases are not apparent across sites, suggesting the effectiveness of standard post-processing procedures. Our results increase confidence in EC, show in which conditions EC and BM estimates can be integrated, and which methodological aspects can improve the convergence between EC and BM.
authors.affiliation: Centre of Excellence PLECO (Plant and Vegetation Ecology), Department of Biology, University of Antwerp, 2610 Wilrijk, Belgium.
authors.forename: M
authors.initials: M
authors.lastname: Campioli
authors.affiliation: Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford OX1 3QY, UK.
authors.forename: Y
authors.initials: Y
authors.lastname: Malhi
authors.affiliation: Centre of Excellence PLECO (Plant and Vegetation Ecology), Department of Biology, University of Antwerp, 2610 Wilrijk, Belgium.
authors.forename: S
authors.identifier: 0000-0001-9812-5837
authors.initials: S
authors.lastname: Vicca
authors.affiliation: LSCE CEA-CNRS-UVSQ, Orme des Merisiers, F-91191 Gif-sur-Yvette, France.
authors.forename: S
authors.initials: S
authors.lastname: Luyssaert
authors.affiliation: DIBAF, University of Tuscia, 01100 Viterbo, Italy.|Euro-Mediterranean Center on Climate Change, CMCC, 73100 Lecce, Italy.
authors.forename: D
authors.initials: D
authors.lastname: Papale
authors.affiliation: CSIC, Global Ecology Unit, CREAF-CEAB-CSIC-UAB, Cerdanyola del Vallès, 08193 Barcelona, Catalonia, Spain.|CREAF, Cerdanyola del Vallès, 08193 Barcelona, Catalonia, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Peñuelas
authors.affiliation: Max Planck Institute for Biogeochemistry, 07745 Jena, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Reichstein
authors.affiliation: Max Planck Institute for Biogeochemistry, 07745 Jena, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Migliavacca
authors.affiliation: School of Geography &Earth Sciences, McMaster University, Hamilton, Ontario, Canada L8S 4K1.
authors.forename: M A
authors.initials: MA
authors.lastname: Arain
authors.affiliation: Centre of Excellence PLECO (Plant and Vegetation Ecology), Department of Biology, University of Antwerp, 2610 Wilrijk, Belgium.
authors.forename: I A
authors.initials: IA
authors.lastname: Janssens
mesh_terms: D001272:Atmosphere / Q000737:chemistry; D002245:Carbon Dioxide / Q000032:analysis*; D017753:Ecosystem; D004784:Environmental Monitoring; D016468:Forestry; D065928:Forests
chemical_list: D002245:Carbon Dioxide