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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 B. Cook 17 K. J. Davis 18 A. J. Dolman 19 B. Gielen 20 M. Goulden J. Grace 21 A. Granier 22 A. Grelle 23 T. Griffis 24 T. Grünwald 25 G. Guidolotti P. J. Hanson R. Harding 26 D. Y. Hollinger 27 L. R. Hutyra 28 P. Kolari 29 B. Kruijt 30 W. Kutsch 31 F. Lagergren 32 T. Laurila 33 B. E. Law 34 G. Le Maire 35 A. Lindroth 32 D. Loustau 36 Y. Malhi 37 J. Mateus M. Migliavacca 38 L. Misson 39 L. Montagnani 40 J. Moncrieff 41, 21 E. Moors 42 J. W. Munger 43 E. Nikinmaa 44 S. V. Ollinger 45 G. Pita 46 C. Rebmann O. Roupsard 47 N. Saigusa M. J. Sanz G. Seufert C. Sierra M. -L. Smith J. Tang R. Valentini 48 T. Vesala 49 I. A. Janssens 20
29 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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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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