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Title: Anticipating global terrestrial ecosystem state change using FLUXNET

Journal Article · · Global Change Biology
DOI:https://doi.org/10.1111/gcb.14602· OSTI ID:1609578
ORCiD logo [1]; ORCiD logo [2];  [3];  [3];  [4]
  1. Univ. of Nebraska, Lincoln, NE (United States)
  2. Northern Arizona Univ., Flagstaff, AZ (United States)
  3. National Center for AgroMeteorology, Seoul (South Korea)
  4. Arizona State Univ., Tempe, AZ (United States)

Abstract Ecosystems can be characterized as complex systems that traverse a variety of functional and structural states in response to changing bioclimatic forcings. A central challenge of global change biology is the robust empirical description of these states and state transitions. An ecosystem's functional state can be empirically described using Process Networks (PN) that use timeseries observations to determine the strength of process‐level functional couplings between ecosystem components. A globally extensive source of in‐situ observations of terrestrial ecosystem dynamics is the FLUXNET eddy‐covariance network that provides standardized observations of micrometeorology and carbon, water, and energy flux dynamics. We employ the LaThuile FLUXNET synthesis dataset to delineate each month's functional state for 204 sites, yielding the LaThuile PN version 1.0 database that describes the strength of an ecosystem's functional couplings from air temperature and precipitation to carbon fluxes during each site‐month. Then we calculate the elasticity of these couplings to seasonal scale forcings: air temperature, precipitation, solar radiation, and phenophase. Finally, we train artificial neural networks to extrapolate these elasticities from 204 sites to the globe, yielding maps of the estimated functional elasticity of every terrestrial ecosystem's functional states to changing seasonal bioclimatic forcings. These maps provide theoretically novel resource that can be used to anticipate ecological state transitions in response to climate change and to validate process‐based models of ecological change. These elasticity maps show that each ecosystem can be expected to respond uniquely to changing forcings. Tropical forests, hot deserts, savannas, and high elevations are most elastic to climate change, and elasticity of ecosystems to seasonal air temperature is on average an order of magnitude higher than elasticity to other bioclimatic forcings. We also observed a reasonable amount of moderate relationships between functional elasticity and structural state change across different ecosystems.

Research Organization:
Oregon State Univ., Corvallis, OR (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
FG02-04ER63911; FG02-04ER63917
OSTI ID:
1609578
Alternate ID(s):
OSTI ID: 1508860
Journal Information:
Global Change Biology, Vol. 25, Issue 7; ISSN 1354-1013
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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Cited By (4)

Effect of Drought-Induced Salinization on Wetland Methane Emissions, Gross Ecosystem Productivity, and Their Interactions journal August 2019
Robust observations of land-to-atmosphere feedbacks using the information flows of FLUXNET journal October 2019
Quantification of Information Exchange in Idealized and Climate System Applications journal November 2019
California air resources board forest carbon protocol invalidates offsets journal January 2019