Evaluation of 11 terrestrial carbon-nitrogen cycle models against observations from two temperate Free-Air CO2 Enrichment studies.

dc.contributor.author

Zaehle, Sönke

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Medlyn, Belinda E

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De Kauwe, Martin G

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Walker, Anthony P

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Dietze, Michael C

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Hickler, Thomas

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Luo, Yiqi

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Wang, Ying-Ping

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El-Masri, Bassil

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Thornton, Peter

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Jain, Atul

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Wang, Shusen

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Warlind, David

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Weng, Ensheng

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Parton, William

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Iversen, Colleen M

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Gallet-Budynek, Anne

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McCarthy, Heather

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Finzi, Adrien

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Hanson, Paul J

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Prentice, I Colin

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Oren, Ram

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Norby, Richard J

dc.date.accessioned

2023-06-02T05:52:12Z

dc.date.available

2023-06-02T05:52:12Z

dc.date.issued

2014-05

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2023-06-02T05:52:09Z

dc.description.abstract

We analysed the responses of 11 ecosystem models to elevated atmospheric [CO2 ] (eCO2 ) at two temperate forest ecosystems (Duke and Oak Ridge National Laboratory (ORNL) Free-Air CO2 Enrichment (FACE) experiments) to test alternative representations of carbon (C)-nitrogen (N) cycle processes. We decomposed the model responses into component processes affecting the response to eCO2 and confronted these with observations from the FACE experiments. Most of the models reproduced the observed initial enhancement of net primary production (NPP) at both sites, but none was able to simulate both the sustained 10-yr enhancement at Duke and the declining response at ORNL: models generally showed signs of progressive N limitation as a result of lower than observed plant N uptake. Nonetheless, many models showed qualitative agreement with observed component processes. The results suggest that improved representation of above-ground-below-ground interactions and better constraints on plant stoichiometry are important for a predictive understanding of eCO2 effects. Improved accuracy of soil organic matter inventories is pivotal to reduce uncertainty in the observed C-N budgets. The two FACE experiments are insufficient to fully constrain terrestrial responses to eCO2 , given the complexity of factors leading to the observed diverging trends, and the consequential inability of the models to explain these trends. Nevertheless, the ecosystem models were able to capture important features of the experiments, lending some support to their projections.

dc.identifier.issn

0028-646X

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1469-8137

dc.identifier.uri

https://hdl.handle.net/10161/27528

dc.language

eng

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Wiley

dc.relation.ispartof

The New phytologist

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10.1111/nph.12697

dc.subject

Carbon Dioxide

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Carbon

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Nitrogen

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Ecosystem

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Biomass

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Atmosphere

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Air

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Models, Biological

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Time Factors

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Carbon Cycle

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Nitrogen Cycle

dc.title

Evaluation of 11 terrestrial carbon-nitrogen cycle models against observations from two temperate Free-Air CO2 Enrichment studies.

dc.type

Journal article

duke.contributor.orcid

Oren, Ram|0000-0002-5654-1733

pubs.begin-page

803

pubs.end-page

822

pubs.issue

3

pubs.organisational-group

Duke

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Nicholas School of the Environment

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Environmental Sciences and Policy

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Earth and Climate Sciences

pubs.publication-status

Published

pubs.volume

202

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