African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6578

Full Length Research Paper

Evapotranspiration and control mechanisms in managed Amazonian forest in, Pará, Brazil

Diego Ribeiro de Aguiar
  • Diego Ribeiro de Aguiar
  • Laboratório de Manejo Florestal, Instituto Nacional de Pesquisas da Amazônia (INPA), Manaus, Amazonas, Brazil.
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Raimundo Cosme de Oliveira Junior
  • Raimundo Cosme de Oliveira Junior
  • Napt Medio Amazonas, Empresa Brasileira de Pesquisa Agropecuária (Embrapa), Santarém, Pará, Brazil.
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Troy Patrick Beldini
  • Troy Patrick Beldini
  • Instituto de Biodiversidade e Floresta, Universidade Federal do Oeste do Pará (UFOPA), Santarém, Pará, Brazil.
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Rodrigo da Silva
  • Rodrigo da Silva
  • Instituto de Engenharia e Geociência, Universidade Federal do Oeste do Pará (UFOPA), Santarém, Pará, Brazil.
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Raphael Tapajos
  • Raphael Tapajos
  • Instituto de Engenharia e Geociência, Universidade Federal do Oeste do Pará (UFOPA), Santarém, Pará, Brazil.
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  •  Received: 10 January 2017
  •  Accepted: 01 March 2017
  •  Published: 04 May 2017

Abstract

This work examines whether management causes changes in evapotranspiration (ET) surface conductance (gs), aerodynamic conductance   (ga) and the decoupling factor (Ω) in managed and natural forest sites in a tropical rain forest in the Amazon. The study was conducted in the Tapajós National Forest (FNT) in managed (logged) and natural (unlogged) forests, which have micrometeorological towers for data capture. For ET estimation, the Penman-Monteith (PM) and Eddy Covariance (EC) equations were used. The models were significantly different only for unlogged (PM 134.9±15.9 mm.month-1 and EC 100.9±11.1 mm.month-1), while the means of the logged site were PM 111.1±15.7 mm.month-1 and EC 108.5±18.3 mm.month-1. Each area has different characteristics for the surface variables, ga, gs and Ω, and therefore the sites were different from each other for the study variables. However, logged ET did not differ for the PM, while EC decreased in the year after the management intervention, and was then followed by an increase.

Key words: Tapajós, water vapor, surface, aerodynamic conductance, decoupling factor.