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Precipitation as driver of carbon fluxes in 11 African ecosystems

Author:
  • L. Merbold
  • Jonas Ardö
  • Almut Arneth
  • R. J. Scholes
  • Y. Nouvellon
  • A. de Grandcourt
  • S. Archibald
  • J. M. Bonnefond
  • N. Boulain
  • N. Brueggemann
  • C. Bruemmer
  • B. Cappelaere
  • E. Ceschia
  • H. A. M. El-Khidir
  • B. A. El-Tahir
  • U. Falk
  • J. Lloyd
  • L. Kergoat
  • V. Le Dantec
  • E. Mougin
  • M. Muchinda
  • M. M. Mukelabai
  • D. Ramier
  • O. Roupsard
  • F. Timouk
  • E. M. Veenendaal
  • W. L. Kutsch
Publishing year: 2009
Language: English
Pages: 1027-1041
Publication/Series: Biogeosciences
Volume: 6
Issue: 6
Document type: Journal article
Publisher: Copernicus Publications

Abstract english

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 320 mm (Sudan) to 1150 mm (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 -12.5 mu mol CO2 m(-2) s(-1) in a dry, open Millet cropland (C-4-plants) up to -48 mu mol CO2 m(-2) s(-1) for a tropical moist grassland. Maximum carbon assimilation rates were highly correlated with mean annual rainfall (r(2)=0.74). Maximum photosynthetic uptake rates (Fp(max)) were positively related to satellite-derived f(APAR). Ecosystem respiration was dependent on temperature at all sites, and was additionally dependent on soil water content at sites receiving less than 1000 mm of rain per year. All included ecosystems dominated by C-3-plants, showed a strong decrease in 30-min assimilation rates with increasing water vapour pressure deficit above 2.0 kPa.

Keywords

  • Physical Geography

Other

Published
  • ISSN: 1726-4189
E-mail: jonas [dot] ardo [at] nateko [dot] lu [dot] se

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Dept of Physical Geography and Ecosystem Science

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Dept of Physical Geography and Ecosystem Science

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Department of Physical Geography and Ecosystem Science
Lund University
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