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  High rates of net ecosystem carbon assimilation by Brachiara pasture in the Brazilian Cerrado

Santos, A. J. B., Quesada, C. A., Da Silva, G. T., Maia, J. F., Miranda, H. S., Miranda, A. C., et al. (2004). High rates of net ecosystem carbon assimilation by Brachiara pasture in the Brazilian Cerrado. Global Change Biology, 10(5), 877-885.

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BGC0694.pdf (Verlagsversion), 318KB
 
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Santos, A. J. B., Autor
Quesada, C. A., Autor
Da Silva, G. T., Autor
Maia, J. F., Autor
Miranda, H. S., Autor
Miranda, A. C.1, Autor           
Lloyd, J.1, Autor           
Affiliations:
1Research Group Carbon-Change Atmosphere, Dr. J. Lloyd, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497762              

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Schlagwörter: Brachiara Cerrado Eddy covariance Net ecosystem excange Pasture Soil organic-matter Closed c-3 wheat Energy-exchange Water-stress Dioxide Fluxes Biomass Efflux Canopy
 Zusammenfassung: To investigate the consequences of land use on carbon and energy exchanges between the ecosystem and atmosphere, we measured CO2 and water vapour fluxes over an introduced Brachiara brizantha pasture located in the Cerrado region of Central Brazil. Measurements using eddy covariance technique were carried out in field campaigns during the wet and dry seasons. Midday CO2 net ecosystem exchange rates during the wet season were -40 mumol m(-2) s(-1), which is more than twice the rate found in the dry season (-15 mumol m(-2) s(-1)). This was observed despite similar magnitudes of irradiance, air and soil temperatures. During the wet season, inferred rates of canopy photosynthesis did not show any tendency to saturate at high solar radiation levels, with rates of around 50 mumol m(-2) s(-1) being observed at the maximum incoming photon flux densities of 2200 mumol m(-2) s(-1). This contrasted strongly to the dry period when light saturation occurred with 1500 mumol m(-2) s(-1) and with maximum canopy photosynthetic rates of only 20 mumol m(-2) s(-1). Both canopy photosynthetic rates and night-time ecosystem CO2 efflux rates were much greater than has been observed for cerrado native vegetation in both the wet and dry seasons. Indeed, observed CO2 exchange rates were also much greater than has previously been reported for C-4 pastures in the tropics. The high rates in the wet season may have been attributable, at least in part, to the pasture not being grazed. Higher than expected net rates of carbon acquisition during the dry season may also have been attributable to some early rain events. Nevertheless, the present study demonstrates that well-managed, productive tropical pastures can attain ecosystem gas exchange rates equivalent to fertilized C-4 crops growing in the temperate zone. [References: 32]

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 Datum: 2004
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Titel: Global Change Biology
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Oxford, UK : Blackwell Science
Seiten: - Band / Heft: 10 (5) Artikelnummer: - Start- / Endseite: 877 - 885 Identifikator: CoNE: https://pure.mpg.de/cone/journals/resource/954925618107
ISSN: 1354-1013