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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/3297

Title: Precipitation as driver of carbon fluxes in 11 African ecosystems
Authors: Merbold, L
Ardo, J
Arneth, A
Scholes, RJ
Nouvellon, Y
De Grandcourt, A
Archibald, SA
Bonnefond, JM
Boulain, N
Bruemmer, C
Brueggemann, N
Cappelaere, B
Ceschia, E
El-Khidir, HAM
El-Tahir, BA
Falk, U
Lloyd, J
Kergoat, L
Le Dantec, V
Mougin, E
Muchinda, M
Mukelabai, MM
Ramier, D
Roupsard, O
Timouk, F
Veenendaal, EM
Kutsch, L
Keywords: Carbon fluxes
Water fluxes
Land atmosphere interface
Eddy covariance
Ecosystem respiration
Carbon assimilation
Water use
Issue Date: 2008
Publisher: Copernicus Group
Citation: Merbold, L, Ardo, J, Arneth, A et al. 2008. Precipitation as driver of carbon fluxes in 11 African ecosystems. Biogeosicences Discussions, Vol. 5, pp 4071-4105
Abstract: This study reports carbon and water fluxes between the land surface and atmosphere in eleven different ecosystems types in Sub-Saharan Africa, as measured using eddy covariance (EC) technology in the first two years of the CarboAfrica network operation. The ecosystems for which data were available ranged in mean annual rainfall from 320mm (Sudan) to 1150mm (The Republic of Congo) and include a spectrum of vegetation types (or land cover) (open savannas, woodlands, croplands and grasslands). Given the shortness of the record, the EC data were analysed across the network rather than longitudinally at sites, in order to understand the driving factors for ecosystem respiration and carbon assimilation, and to reveal the different water use strategies in these highly seasonal environments. Values for maximum net carbon assimilation rates (photosynthesis) ranged from 12 µmolCO2 m-2 s-1 in a dry, open Acacia savannah (C3-plants) up to 40 µmolCO2 m-2 s-1 for a tropical moist grassland. Maximum carbon assimilation rates were highly correlated with mean annual rainfall (R2=0.89). Maximum photosynthetic uptake rates were positively related to satellite-derived fAPAR. Ecosystem respiration was dependent on temperature at all sites, and was additionally dependent on soil water content at sites receiving less than 1000mm of rain per year. All included ecosystems, except the Congolese grassland, showed a strong decrease in 30-min assimilation rates with increasing water vapour pressure deficit above 2.0 kPa
Description: Copyright: 2008 Copernicus Group & Creative Commons License
URI: http://hdl.handle.net/10204/3297
ISSN: 1810-6285
Appears in Collections:Water resources and human health
Climate change
Ecosystems processes & dynamics
General science, engineering & technology

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