Details van artikel 100 van 144 gevonden artikelen
Precipitation as driver of carbon fluxes in 11 African ecosystems
Titel:
Precipitation as driver of carbon fluxes in 11 African ecosystems
Auteur:
L. Merbold J. Ardö A. Arneth R. J. Scholes Y. Nouvellon A. de Grandcourt S. Archibald J. M. Bonnefond N. Boulain C. Bruemmer N. Brueggemann 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
Verschenen in:
Biogeosciences discussions
Paginering:
Jaargang 5 (2008) nr. 5 pagina's 4071-4105
Jaar:
2008
Inhoud:
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 (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. <br><br> Values for maximum net carbon assimilation rates (photosynthesis) ranged from 12 μmol CO2 m<sup>−2 s<sup>−1 in a dry, open Acacia savanna (C3-plants) up to 40 μmol CO2 m<sup>−2 s<sup>−1 for a tropical moist grassland. Maximum carbon assimilation rates were highly correlated with mean annual rainfall (R<sup>2=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 1000 mm 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.
Uitgever:
Copernicus GmbH (provided by DOAJ)
Bronbestand:
Elektronische Wetenschappelijke Tijdschriften
Details van artikel 100 van 144 gevonden artikelen