EGU23-11338, updated on 26 Feb 2023
EGU General Assembly 2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

AmazonFACE: A Free Air CO2 Enrichment Experiment in the Amazon rainforest is ready to launch

Rammig Anja1, Lapola David2, and the AmazonFACE Team*
Rammig Anja and Lapola David and the AmazonFACE Team
  • 1Technical University of Munich, TUM School of Life Sciences, Freising, Germany
  • 2University of Campinas, Center for Meteorological and Climatic Research Applied to Agriculture, Campinas, Brazil
  • *A full list of authors appears at the end of the abstract

Atmospheric CO2 concentrations are still rising due to land-use change and fossil fuel burning, and have unambiguously influenced Earth’s climate system and terrestrial ecosystems. Plant responses to rising atmospheric CO2 concentrations may have induced an increase in biomass and thus, increased the carbon sink in forests worldwide. Rising CO2 directly stimulates photosynthesis (the so-called CO2-fertilization effect) and tends to reduce stomatal conductance, leading to enhanced water-use efficiency, which may provide an important buffering effect for plants during adverse climate conditions. For these reasons, current global climate simulations consistently predict that tropical forests will continue to sequester more carbon in aboveground biomass. However, several lines of evidence point towards a decreasing carbon sink strength of the Amazon rainforest in the coming decades, potentially driven by nutrient limitation, droughts or other factors. Mechanistically modelling the effects of rising CO2 in the Amazon rainforest are hindered by a lack of direct observations from ecosystem scale CO2 experiments. To address these critical issues, we are currently building a free-air CO2 enrichment (FACE) experiment in an old-growth, highly diverse, tropical forest in the Brazilian Amazon and we here present our main hypotheses that underpin the AmazonFACE experiment.  We focus on possible effects of rising CO2 on carbon uptake and allocation, phosphorus cycling, water-use and plant-herbivore interactions, and discuss relevant ecophysiological processes, which need to be implemented in dynamic vegetation models to estimate future changes of the Amazon carbon sink. We also report on baseline measurements at the AmazonFACE site and show the progress on model development with regard to phosphorus uptake strategies.

AmazonFACE Team:

Luciana R Bachega, Nathielly Martins, Pamela P Leite, Ana Caroline Pereira, Iokanam Pereira, Alacimar Guedes, Sabrina Garcia, Flavia Santana, Izabela Aleixo, Bruno TT Portela, Amanda Damasceno, Gabriela Ushida, Vanessa Ferrer, Vanessa, Cassio Souza, Anna CM Moraes, Carlos A Quesada (National Institute of Amazonian Research, Brazil); Lucia Fuchslueger (University of Vienna, Austria); Oscar Valverde-Barrantes (Florida International University, USA); Iain P Hartley, Lina Mercado, Lucy Rowland (University of Exeter, UK); Thorsten Grams, Laynara Lugli, Tatiana Reichert (Technical University of Munich, Germany); Katrin Fleischer (Max-Planck-Institute for Biogeochemistry, Germany); Adriane Esquivel-Muelbert (University of Birmingham, UK); Richard Norby (University of Birmingham, UK and Oak Ridge National Laboratory, USA); Florian Hofhansl (International Institute for Applied Systems Analysis, Austria); Bart Kruijt (Wageningen University, Netherlands); Martin DeKauwe (University of Bristol, UK); Marko Monteiro (University of Campinas)

How to cite: Anja, R. and David, L. and the AmazonFACE Team: AmazonFACE: A Free Air CO2 Enrichment Experiment in the Amazon rainforest is ready to launch, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-11338,, 2023.