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Fluxes of CO2 above a sugarcane plantation in Brazil

Cabral, Osvaldo M.R.; Rocha, Humberto R.; Gash, John H.; Ligo, Marcos A.V.; Ramos, Nilza Patrícia; Packer, Ana Paula; Batista, Eunice Reis. 2013 Fluxes of CO2 above a sugarcane plantation in Brazil. Agricultural and Forest Meteorology, 182-183. 54-66. 10.1016/j.agrformet.2013.08.004

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Abstract/Summary

Fluxes of CO2 were measured above a sugarcane plantation using the eddy-covariance method covering two growth cycles, representing the second and third re-growth (ratoons) harvested with stubble burning. The total net ecosystem exchange (NEE) in the first cycle (second ratoon, 393 days long) was −1964 ± 44 g C m−2; the gross ecosystem productivity (GEP) was 3612 ± 46 g C m−2 and the ecosystem respiration (RE) was 1648 ± 14 g C m−2. The NEE and GEP totals in the second cycle (third ratoon, 374 days long) decreased 51% and 25%, respectively and RE increased 7%. Accounting for the carbon emitted during biomass burning and the removal of stalks at harvest, net ecosystem carbon balance (NECB) totals were 102 ± 130 g C m−2 and 403 ± 84 g C m−2 in each cycle respectively. Thus the sugarcane agrosystem was approximately carbon neutral in the second ratoon. Yield in stalks fresh weight (SFW) attained the regional average (8.3 kg SFW m−2). Although it was a carbon source to the atmosphere, observed productivity (6.2 kg SFW m−2) of the third ratoon was 19% lower than the regional average due to the lower water availability observed during the initial 120 days of re-growth. However, the overall water use efficiency (WUE) achieved in the first cycle (4.3 g C kg−1 H2O) decreased only 5% in the second cycle.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.agrformet.2013.08.004
Programmes: CEH Topics & Objectives 2009 - 2012 > Biogeochemistry > BGC Topic 2 - Biogeochemistry and Climate System Processes > BGC - 2.2 - Measure and model surface atmosphere exchanges of energy ...
CEH Sections: CEH Fellows
ISSN: 0168-1923
Additional Keywords: CO2 fluxes, sugarcane, respiration, eddy covariance, biomass, soil water deficits
NORA Subject Terms: Meteorology and Climatology
Date made live: 12 Sep 2013 12:50 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/503199

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