Evaluation of 11 terrestrial carbon-nitrogen cycle models against observations from two temperate free-air CO2 enrichment studies

Autor: Zaehle, Sönke, Medlyn, Belinda E., De Kauwe, Martin G., Walker, Anthony P., Dietze, Michael C., Hickler, Thomas, Luo, Yiqi, Wang, Ying-Ping, El-Masri, Bassil, Thornton, Peter, Jain, Atul, Wang, Shusen, Warlind, David, Weng, Ensheng, Parton, William, Iversen, Colleen M., Gallet-Budynek, Anne, McCarthy, Heather, Finzi, Adrien, Hanson, Paul J., Prentice, Iain Colin, Oren, Ram, Norby, Richard J.
Přispěvatelé: Max Planck Institute for Biogeochemistry (MPI-BGC), Max-Planck-Gesellschaft, Department of Biological Science, University of Denver, Oak Ridge National Laboratory, Department of Earth and Environment [Boston], Boston University [Boston] (BU), Biodiversity and Climate Research Centre (BiK-F) (LOEWE), Department of Physical Geography, Goethe-Universität Frankfurt am Main, University of Oklahoma (OU), Commonwealth Scientific and Industrial Research Organisation [Canberra] (CSIRO), Department of Atmospheric Sciences, Yonsei University, Department of Atmospheric Science, Colorado State University [Fort Collins] (CSU), Natural Resources Canada (NRCan), Department of Physical Geography and Ecosystem Science, Lund University, Department of Ecology and Evolutionary Biology, Princeton University, Transfert Sol-Plante et Cycle des Eléments Minéraux dans les Ecosystèmes Cultivés (TCEM), Institut National de la Recherche Agronomique (INRA)-École Nationale d'Ingénieurs des Travaux Agricoles - Bordeaux (ENITAB), Department of Biology [Gainesville] (UF|Biology), University of Florida [Gainesville] (UF), Imperial College London, Duke University [Durham], Swedish University of Agricultural Sciences (SLU), National Center for Ecological Analysis and Synthesis, National Science Foundation (NSF) [EF-0553768], University of California, Santa Barbara, State of California, US Department of Energy Office of Science, Biological and Environmental Research Program, FP7 people programme [PERG02-GA-2007-224775, 238366], ARC [DP1094791], Hesse's Ministry of Higher Education, [FACE], [DE-FG02-95ER62083], European Project: 238366,EC:FP7:PEOPLE,FP7-PEOPLE-ITN-2008,GREENCYCLESII(2010)
Rok vydání: 2014
Předmět:
Zdroj: New Phytologist
New Phytologist, Wiley, 2014, 202 (3), pp.803-822. ⟨10.1111/nph.12697⟩
The New Phytologist
ISSN: 0028-646X
1469-8137
DOI: 10.1111/nph.12697⟩
Popis: International audience; 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.
Databáze: OpenAIRE
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