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CO2 balance of boreal, temperate, and tropical forests derived from a global database

S. Luyssaert 1 I. Inglima M. Jung 2 A. D. Richardson 3 M. Reichstein 4 D. Papale 5 S. L. Piao 6, 7 E. -D. Schulze 8 L. Wingate 9 G. Matteucci 10 L. Aragao 11 M. Aubinet 12 C. Beer 4 C. Bernhofer 13 K. G. Black D. Bonal 14 J. -M. Bonnefond 9 J. Chambers 15 P. Ciais 16, 17 B. Cook 18 K. J. Davis 19 A. J. Dolman 20 B. Gielen 21 M. Goulden J. Grace 22 A. Granier 23 A. Grelle 24 T. Griffis 25 T. Grünwald 26 G. Guidolotti P. J. Hanson R. Harding 27 D. Y. Hollinger 28 L. R. Hutyra 29 P. Kolari 30 B. Kruijt 31 W. Kutsch 32 F. Lagergren 33 T. Laurila 34 B. E. Law 35 G. Le Maire 36 A. Lindroth 33 D. Loustau 37 Y. Malhi 38 J. Mateus M. Migliavacca 39 L. Misson 40 L. Montagnani 41 J. Moncrieff 42, 22 E. Moors 43 J. W. Munger 44 E. Nikinmaa 45 S. V. Ollinger 46 G. Pita 47 C. Rebmann O. Roupsard 48 N. Saigusa M. J. Sanz G. Seufert C. Sierra M. -L. Smith J. Tang R. Valentini 49 T. Vesala 50 I. A. Janssens 21
LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] : DRF/LSCE
30 Forest Ecology and Management [Helsinki]
Department of Forest Sciences [Helsinki]
Abstract : Terrestrial ecosystems sequester 2.1 Pg of atmospheric carbon annually. A large amount of the terrestrial sink is realized by forests. However, considerable uncertainties remain regarding the fate of this carbon over both short and long timescales. Relevant data to address these uncertainties are being collected at many sites around the world, but syntheses of these data are still sparse. To facilitate future synthesis activities, we have assembled a comprehensive global database for forest ecosystems, which includes carbon budget variables (fluxes and stocks), ecosystem traits (e.g. leaf area index, age), as well as ancillary site information such as management regime, climate, and soil characteristics. This publicly available database can be used to quantify global, regional or biome-specific carbon budgets; to re-examine established relationships; to test emerging hypotheses about ecosystem functioning [e.g. a constant net ecosystem production (NEP) to gross primary production (GPP) ratio]; and as benchmarks for model evaluations. In this paper, we present the first analysis of this database. We discuss the climatic influences on GPP, net primary production (NPP) and NEP and present the CO2 balances for boreal, temperate, and tropical forest biomes based on micrometeorological, ecophysiological, and biometric flux and inventory estimates. Globally, GPP of forests benefited from higher temperatures and precipitation whereas NPP saturated above either a threshold of 1500 mm precipitation or a mean annual temperature of 10 degrees C. The global pattern in NEP was insensitive to climate and is hypothesized to be mainly determined by nonclimatic conditions such as successional stage, management, site history, and site disturbance. In all biomes, closing the CO2 balance required the introduction of substantial biome-specific closure terms. Nonclosure was taken as an indication that respiratory processes, advection, and non-CO2 carbon fluxes are not presently being adequately accounted for.
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Submitted on : Thursday, November 6, 2014 - 3:30:38 PM
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S. Luyssaert, I. Inglima, M. Jung, A. D. Richardson, M. Reichstein, et al.. CO2 balance of boreal, temperate, and tropical forests derived from a global database. Global Change Biology, Wiley, 2007, 13 (12), pp.1-29. ⟨10.1111/j.1365-2486.2007.01439.x⟩. ⟨hal-01080954⟩



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