Cited by 111Plant Water Relations and Carbon DynamicsFire effects on ecosystemsForest ecology and management

Ecosystem heterogeneity and diversity mitigate Amazon forest resilience to frequent extreme droughts

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Longo, Marcos, Knox, Ryan G., Levine, Naomi M., Alves, Luciana F., Bonal, Damien, Camargo, Plinio B., Fitzjarrald, David R., Hayek, Matthew N. +9 more·2018·New Phytologist

Abstract

Summary: The impact of increases in drought frequency on the Amazon forest's composition, structure and functioning remain uncertain. We used a process‐ and individual‐based ecosystem model (ED 2) to quantify the forest's vulnerability to increased drought recurrence. We generated meteorologically realistic, drier‐than‐observed rainfall scenarios for two Amazon forest sites, Paracou (wetter) and Tapajós (drier), to evaluate the impacts of more frequent droughts on forest biomass, structure and composition. The wet site was insensitive to the tested scenarios, whereas at the dry site biomass declined when average rainfall reduction exceeded 15%, due to high mortality of large‐sized evergreen trees. Biomass losses persisted when year‐long drought recurrence was shorter than 2–7 yr, depending upon soil texture and leaf phenology. From the site‐level scenario results, we developed regionally applicable metrics to quantify the Amazon forest's climatological proximity to rainfall regimes likely to cause biomass loss > 20% in 50 yr according to ED 2 predictions. Nearly 25% (1.8 million km 2) of the Amazon forests could experience frequent droughts and biomass loss if mean annual rainfall or interannual variability changed by 2σ. At least 10% of the high‐emission climate projections (CMIP 5/RCP 8.5 models) predict critically dry regimes over 25% of the Amazon forest area by 2100.

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  • Amazonian forests are heterogeneous in their resilience to disturbances, which may have contributed to buffering large-scale transitions in the past.

    “Amazonian forests are heterogeneous in their resilience to disturbances, which may have contributed to buffering large-scale transitions in the past37,61,62.”

    From Critical transitions in the Amazon forest system (2024) · cites this paper as [61]

    The Regional patterns of vulnerability section describes differences in drought resilience across Amazonian regions, and the Impacts of climate variability section says canopy reorganization can make responses to climate change more gradual. These passages support heterogeneous resilience and a possible buffering mechanism, but they do not establish that it buffered large-scale transitions in the past. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • Simulating individual trees can improve the representation of growth and mortality dynamics, which ultimately affect forest dynamics.

    “Simulating individual trees can improve the representation of growth and mortality dynamics, which ultimately affect forest dynamics (for example, refs. 61,62,99).”

    From Critical transitions in the Amazon forest system (2024) · cites this paper as [61]

    The Ecosystem Demography Model, version 2 section describes a size- and age-structured model, and Site-level simulations link size-dependent growth and mortality to changes in forest structure. This supports the importance of representing tree-level differences, but the paper describes structured equations rather than simulations of individual trees and does not show that individual-tree simulation improves the representation of those dynamics. (LLM, conf=0.82)

    Experimental — accuracy not yet measured

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1 of the 121 references couldn’t be matched to a known paper.

Research works printed but not linked: 3

  1. Chen M, Xie P, Janowiak JE, Arkin PA. 2002. Global land precipitation: a 50-yr monthly analysis based on gauge observations. Journal of Hydrometeorology 3: 249-266.
  2. Barros VR, Field CB, Dokken DJ, Mastrandrea MD, Mach KJ, Bilir TE. 2012. In: Chatterjee M, Ebi KL, Estrada YO, Genova RC et al., eds. 2014. Climate change 2014: impacts, adaptation, and vulnerability. Part B: regional aspects. Contribution of Working Group II to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, UK & New York, NY, USA: Cambridge University Press.
  3. Knox RG. 2012. Land conversion in Amazonia and Northern South America; influences on regional hydrology and ecosystem response. PhD thesis, Massachusetts Institute of Technology, Cambridge, MA, USA.

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Authors
Longo, M., Knox, R. G., Levine, N. M., Alves, L. F., Bonal, D., Camargo, P. B., Fitzjarrald, D. R., Hayek, M. N., Restrepo‐Coupe, N., Saleska, S. R., da Silva, R., Stark, S. C., Tapajós, R. P., Wiedemann, K. T., Zhang, K., Wofsy, S. C., & Moorcroft, P. R.
Affiliations
  • Jet Propulsion Laboratory (US)
  • Lawrence Berkeley National Laboratory (US)
  • University of Southern California (US)
  • University of California, Los Angeles (US)
  • Ecologie et Ecophysiologie Forestières (FR)
  • Centro de Energia Nuclear na Agricultura Universidade de São Paulo Piracicaba SP 13416‐000 Brazil
  • University at Albany, State University of New York (US)
  • Harvard University (US)
  • Climate Change Cluster University of Technology Sydney Sydney NSW 2007 Australia
  • University of Arizona (US)
  • Universidade Federal do Oeste do Pará Santarém PA 68040‐255 USA
  • Michigan State University (US)
  • Universidade Federal do Oeste do Pará (BR)
  • Hohai University (CN)
Corresponding author
Moorcroft, Paul R.
Venue
New Phytologist
Publisher
Wiley
Published
2018-05-22
Volume
219
Issue
3
Pages
914-931
ISSN
  • 0028-646X (ISSN-L)
  • 1469-8137
OpenAlex
W2803398890
Cited by
111
References
121
Citations by year
2026: 8 · 2025: 12 · 2024: 9 · 2023: 9 · 2022: 27 · 2021: 20 · 2020: 12 · 2019: 7 · 2018: 7
FWCI
6.73
Type
journal article
Language
en
Open access
Locations
  • New Phytologist (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
  • HAL (submittedVersion, cc-by)
  • eScholarship (California Digital Library) (submittedVersion)
  • NOAA Institutional Repository (submittedVersion, cc-by)
  • UTS ePRESS (University of Technology Sydney) (submittedVersion)
Funders
  • Agence Nationale de la Recherche (ANR‐10‐LABX‐0025)
  • National Oceanic and Atmospheric Administration
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico (200686/2005‐4)
  • Fundação de Amparo à Pesquisa do Estado de São Paulo
  • National Aeronautics and Space Administration (NNX08AP68A, NNX08AU95H, NNX10AR75G)
  • National Science Foundation (0730305)
  • Gordon and Betty Moore Foundation (1971, 3413)
Topics
  • Physical Sciences › Environmental Science › Global and Planetary Change › Plant Water Relations and Carbon Dynamics
  • Physical Sciences › Environmental Science › Global and Planetary Change › Fire effects on ecosystems
  • Physical Sciences › Environmental Science › Nature and Landscape Conservation › Forest ecology and management
Keywords
Amazon rainforest, drought frequency, forest resilience, ecosystem heterogeneity, biodiversity, forest biomass loss, tree mortality, evergreen trees, soil texture, leaf phenology, climate change projections, RCP8.5, Paracou, Tapajós, forest structure and composition
MeSH terms
Carbon Dioxide, Computer Simulation, Geography, Models, Theoretical, Rain, South America, Plant Transpiration, Biomass, Droughts, Forests

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