Land-use change effects on local energy, water, and carbon balances in an Amazonian agricultural field

To study how changing agricultural practices in the eastern Amazon affect carbon, heat and water exchanges, a 20 m tower was installed in a field in August 2000. Measurements include turbulent fluxes (momentum, heat, water vapor, and CO2) using the eddy covariance (EC) approach, soil heat flux, wind...

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Bibliographic Details
Published in:Global change biology 2004-05, Vol.10 (5), p.895-907
Main Authors: Sakai, R.K, Fitzjarrald, D.R, Moraes, O.L.L, Staebler, R.M, Acevedo, O.C, Czikowsky, M.J, Silva, R. da, Brait, E, Miranda, V
Format: Article
Language:English
Subjects:
evaporation
land use change
NEE
PAR
solar radiation
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Summary:To study how changing agricultural practices in the eastern Amazon affect carbon, heat and water exchanges, a 20 m tower was installed in a field in August 2000. Measurements include turbulent fluxes (momentum, heat, water vapor, and CO2) using the eddy covariance (EC) approach, soil heat flux, wind, and scalar profiles (T, q, and CO2), soil moisture content, terrestrial, total solar radiation, and photosynthetically active radiation (PAR, 400–700 nm). At the beginning of the measurements, in September 2000, the field was a pasture. On November 2001, the pasture was burned, plowed, and planted in upland (nonirrigated) rice. Calm nights were the norm in this site. Anomalously low values of net ecosystem exchange (NEE) were found using the EC method, even when the common criterion u*
ISSN:1354-1013
1365-2486
DOI:10.1111/j.1529-8817.2003.00773.x