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Title: Environmental and biophysical controls of evapotranspiration from Seasonally Dry Tropical Forests (Caatinga) in the Brazilian Semiarid
Authors: Marques, Thiago Valentim
Mendes, Keila
Mutti, Pedro Rodrigues
Medeiros, Salomão de Sousa
Silva, Lindenberg L.
Peréz-Marin, Aldrin Martin
Campos, Suany
Lúcio, Paulo Sérgio
Lima, Kellen Carla
Reis, Jean dos
Ramos, Tarsila M.
Silva, Daniel F.
Oliveira, Cristiano Prestrelo de
Costa, Gabriel Brito
Antonino, Antonio Celso Dantas
Menezes, Rômulo Simões Cezar
Silva, Cláudio Moisés Santos e
Bezerra, Bergson Guedes
Keywords: Caatinga Biome;Brazilian Semiarid;Evapotranspiration;Bulk surface conductance;Decoupling factor
Issue Date: 15-Jun-2020
Publisher: Elsevier
Citation: MARQUES, T.V.; MENDES, K.; MUTTI, P.; MEDEIROS, S.; SILVA, L.; PEREZ-MARIN, A.M.; CAMPOS, S.; LÚCIO, P.S.; LIMA, K.; REIS, J.. Environmental and biophysical controls of evapotranspiration from Seasonally Dry Tropical Forests (Caatinga) in the Brazilian Semiarid. Agricultural and Forest Meteorology, [s.l.], v. 287, p. 107957, jun. 2020. Disponível em: Acesso em: 10 ago. 2020.
Portuguese Abstract: Seasonally dry tropical forests are among the most important biomes regarding regional and global hydrological and carbon fluxes. Thus, the objective of this study was to evaluate the seasonal and interannual variability of evapotranspiration (ET) and its biophysical control and characteristics (surface conductance—Gs; decoupling coefficient—Ω; ratio between actual evapotranspiration and equilibrium evapotranspiration—ET/ETeq) in a preserved Caatinga Biome environment during two dry years in the Northeast Brazil region. A study on this subject with this level of detail in this biome is unprecedent. Measurements were carried out using an eddy covariance system during the period from 1st January 2014 to 31st December 2015. The lowest ET values were observed in the dry season of both experiment years (0.3 and 0.2 mm day−1) as a consequence of poor water availability, which favored partial stomatal closure and reduced Gs values (0.22 and 0.13 mm s−1). The opposite occurred in the wet season, when ET (2.6 and 1.7 mm day−1) and Gs (3.74 and 2.13 mm s−1) means reached higher values. Regarding annual values, differences between total annual rainfall in both years is the most probable cause for the differences observed in annual ET values. In 2014, annual ET was of 473.3 mm while in 2015 it was 283.4 mm, which incurred in an overall decrease in Gs, Ω and ET/ETeq values. Leaf senescence and extremely low Gs values during the dry season suggest that the trees of the Caatinga Biome are more resilient regarding the use of water and are avoiding water stress caused under low water availability
ISSN: 0168-1923
Appears in Collections:CCET - DCAC - Artigo publicado em periódicos
ECT - Artigos publicados em periódicos

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