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Article Dans Une Revue Biogeosciences Année : 2018

Asymmetric responses of primary productivity to altered precipitation simulated by ecosystem models across three long-term grassland sites

1 Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences
2 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
3 ICOS-ATC - ICOS-ATC
4 CEA - Commissariat à l'énergie atomique et aux énergies alternatives
5 MOSAIC - Modélisation des Surfaces et Interfaces Continentales
6 CSU - Colorado State University [Fort Collins]
7 OU - University of Oklahoma
8 Institute of Ecology
9 Department of Biology, Centre of Excellence PLECO (Plant and Vegetation Ecology)
10 ETH Zürich - Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich]
11 MPI-BGC - Max Planck Institute for Biogeochemistry
12 UC San Francisco - University of California [San Francisco]
13 NIES - National Institute for Environmental Studies
14 IMK-IFU - Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung
15 UQTR - Université du Québec à Trois-Rivières
16 Environmental Sciences Division [Oak Ridge]
17 NEFU - Northeast Forestry University
18 SDAU - Shandong Agricultural University
19 Institute of Arctic Biology
20 CHUM - Centre Hospitalier de l'Université de Montréal
21 MPI-M - Max Planck Institute for Meteorology
22 DGE - Department of Global Ecology [Carnegie]
23 KIT - Karlsruhe Institute of Technology
24 Leopold Franzens Universität Innsbruck - University of Innsbruck
25 Research School of Biology [Canberra, Australia]
26 Northwest A and F University
27 IAC - Institute for Atmospheric and Climate Science [Zürich]
28 AU - Auburn University
29 University of Exeter
30 CCSI - Climate Change Science Institute [Oak Ridge]
31 CSIRO Marine and Atmospheric Research [Aspendale]
32 Department of Microbiology and Plant Biology
33 ERA - Environnement de Réseaux Autonomes
Michael Bahn
Melinda Smith
  • Fonction : Auteur
Anna Harper
  • Fonction : Auteur
Anna Ukkola
  • Fonction : Auteur
Athanasios Paschalis
  • Fonction : Auteur
David Reinthaler
  • Fonction : Auteur
Hanqin Tian
Hélène Genet
  • Fonction : Auteur
  • PersonId : 787926
  • IdRef : 143239724
Johannes Ingrisch
  • Fonction : Auteur
Julia Nabel
Julia Pongratz
Lena Boysen
Markus Kautz
Shree Dangal
Stephen Sitch

Résumé

Field measurements of aboveground net primary productivity (ANPP) in temperate grasslands suggest that both positive and negative asymmetric responses to changes in precipitation (P) may occur. Under normal range of precipitation variability, wet years typically result in ANPP gains being larger than ANPP declines in dry years (posi-tive asymmetry), whereas increases in ANPP are lower in magnitude in extreme wet years compared to reductions during extreme drought (negative asymmetry). Whether the current generation of ecosystem models with a coupled carbon-water system in grasslands are capable of simulating these asymmetric ANPP responses is an unresolved question. In this study, we evaluated the simulated responses of temperate grassland primary productivity to scenarios of altered precipitation with 14 ecosystem models at three sites: Short-grass steppe (SGS), Konza Prairie (KNZ) and Stubai Valley meadow (STU), spanning a rainfall gradient from dry to moist. We found that (1) the spatial slopes derived from modeled primary productivity and precipitation across sites were steeper than the temporal slopes obtained from inter-annual variations, which was consistent with empirical data; (2) the asymmetry of the responses of modeled primary productivity under normal inter-annual precipitation variability differed among models, and the mean of the model ensemble suggested a negative asymmetry across the three sites, which was contrary to empirical evidence based on filed observations ; (3) the mean sensitivity of modeled productivity to rainfall suggested greater negative response with reduced precipitation than positive response to an increased precipitation under extreme conditions at the three sites; and (4) gross primary productivity (GPP), net primary productivity (NPP), aboveground NPP (ANPP) and belowground NPP (BNPP) all showed concave-down nonlinear responses to altered precipitation in all the models, but with different curvatures and mean values. Our results indicated that most models overestimate the negative drought effects and/or underestimate the positive effects of increased precipitation on primary productivity under normal climate conditions, highlighting the need for improving eco-hydrological processes in those models in the future.
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Dates et versions

hal-02900810 , version 1 (26-10-2020)

Identifiants

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Donghai Wu, Philippe Ciais, Nicolas Viovy, Alan Knapp, Kevin Wilcox, et al.. Asymmetric responses of primary productivity to altered precipitation simulated by ecosystem models across three long-term grassland sites. Biogeosciences, 2018, 15 (11), pp.3421-3437. ⟨10.5194/bg-15-3421-2018⟩. ⟨hal-02900810⟩
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