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IMPACTS OF SOYABEAN EXPANSION ON THE AMAZON ENERGY BALANCE: A CASE STUDY

Published online by Cambridge University Press:  06 May 2011

PAULO JORGE DE OLIVEIRA PONTE DE SOUZA ,
ARISTIDES RIBEIRO ,
EDSON JOSÉ PAULINO DA ROCHA ,
MARCEL DO NASCIMENTO BOTELHO ,
ADRIANO MARLISOM LEÃO DE SOUSA ,
EVERALDO BARREIROS DE SOUZA  and
JOSÉ RENATO BOUÇAS FARIAS
PAULO JORGE DE OLIVEIRA PONTE DE SOUZA*
Affiliation:
Social-Environmental and Water Resources Institute, Federal Rural University of Amazonia, PO Box 917, Belem-PA, Brazil
ARISTIDES RIBEIRO
Affiliation:
Department of Agricultural Engineering, Federal University of Viçosa, Zip Code 36570-000, Viçosa-MG, Brazil
EDSON JOSÉ PAULINO DA ROCHA
Affiliation:
Department of Meteorology, Federal University of Para, Zip Code 66075-110, Belem-PA, Brazil
MARCEL DO NASCIMENTO BOTELHO
Affiliation:
Social-Environmental and Water Resources Institute, Federal Rural University of Amazonia, PO Box 917, Belem-PA, Brazil
ADRIANO MARLISOM LEÃO DE SOUSA
Affiliation:
Social-Environmental and Water Resources Institute, Federal Rural University of Amazonia, PO Box 917, Belem-PA, Brazil
EVERALDO BARREIROS DE SOUZA
Affiliation:
Department of Meteorology, Federal University of Para, Zip Code 66075-110, Belem-PA, Brazil
JOSÉ RENATO BOUÇAS FARIAS
Affiliation:
Soyabean Ecophysiology, Brazilian Agricultural Research Corporation Zip Code 860001-970, Londrina-PR, Brazil
*
‡Corresponding author: [email protected]
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Summary

A micrometeorological experiment was carried out in an area of soyabean cultivation located in northeastern Para state, Brazil, in order to evaluate impacts on the local energy balance due to replacement of forests by soyabean. The meteorological data from forest ecosystems were collected in Caxiuanã forests located in central Para. The energy balance components were obtained using the Bowen ratio technique. Differences in energy balance components between ecosystems were significant during the soyabean growing season and more significant between growing seasons. During the soyabean growing season mean impacts of −15%, −9% and −27% on net radiation, latent heat flux (LE) and sensible heat flux (H), respectively, were observed. At specific soyabean stages, LE was higher than in the forest because of the high soyabean surface conductance of water vapour. However, during the production off-season the impacts were more significant (p < 0.05), showing a reduction of 78% in LE and a substantial increase in H (84%) because of the absence of vegetation cover over this period.

Type
Research Article
Information
Experimental Agriculture , Volume 47 , Issue 3 , July 2011 , pp. 553 - 567
Copyright
Copyright © Cambridge University Press 2011

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