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The energy and water balance of a Eucalyptus plantation in southeast Brazil

By Osvaldo M.R. Cabral, Humberto R. Rocha, John H.C. Gash, Marcos A.V. Ligo, Helber C. Freitas and Jonatan D. Tatsch

Abstract

The eddy covariance method was used to measure energy and water balance of a plantation of Eucalyptus (grandis × urophylla) hybrids over a 2 year period. The average daily evaporation rates were 5.4 (±2.0) mm day−1 in summer, but fell to 1.2 (±0.3) mm day−1 in winter. In contrast, the sensible heat flux was relatively low in summer but dominated the energy balance in winter. Evaporation accounted for 80% and 26% of the available energy, in summer and winter respectively. The annual evaporation was 82% (1124 mm) and 96% (1235 mm) of the annual rainfall recorded during the first and second year, respectively. Daily average canopy and aerodynamic conductance to water vapour were in the summer 51.9 (±38.4) mm s−1 and 84.1 (±25.6) mm s−1, respectively; and in the winter 6.0 (±10.5) mm s−1 and 111.6 (±24.6) mm s−1, respectively

Topics: Hydrology
Publisher: Elsevier
Year: 2010
DOI identifier: 10.1016/jhydrol.2010.04.041
OAI identifier: oai:nora.nerc.ac.uk:10107
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