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|Research center of Embrapa/Collection:||Embrapa Semiárido - Artigo em periódico indexado (ALICE)|
|Type of Material:||Artigo em periódico indexado (ALICE)|
|Authors:||TEIXEIRA, A. H. de C.|
BASTIAANSSEN, W. G. M.
AHMAD, N. D.
MOURA, M. S. B. de
BOS, M. G.
|Additional Information:||ANTONIO HERIBERTO DE C TEIXEIRA, CNPM; W.G.M. Bastiaanssen University of Technology Stevinweg; M. D. Ahmad, International Water Management Institute; MAGNA SOELMA BESERRA DE MOURA, CPATSA; M. G. Bos, International Water Management Institute. a.|
|Title:||Analysis of energy fluxes and vegetation-atmosphere parameters in irrigated and natural ecosystems of semi-arid Brazil.|
|Publisher:||Journal of Hydrology, Amsterdam, v. 362, p. 110-127, 2008.|
|Description:||Knowledge on evapotranspiration is essential in quantifying water use depletion and to allocate scarce water resources to competing uses. Despite that an extensive literature describes the theoretical mechanisms of turbulent water vapour transport above and within crop canopies fewer studies have examined land surface parameters within composite landscapes of irrigated crops and semi-arid natural vegetation. Aiming to improve parameterizations of the radiation and energy balance in irrigated crops and natural vegetation, micro-climatic measurements were carried out on irrigated land (vineyards and mango orchard) and natural vegetation (caatinga) in the semi-arid zone of the San Francisco River basin (Brazil) from 2002 to 2005. The fractions of 24 h incident solar radiation available for net radiation were 46%, 55%, 51% and 53%, for wine grape, table grape, mango orchard and caatinga, respectively. Daily evaporative fractions of the net available energy used as latent heat flux (kE) were 0.80, 0.88, 0.75 and 0.33 respectively. The daylight values of bulk surface resistances (rs) averaged 128 s m1, 73sm1, 133 s m1 and 1940 s m1 for wine grape, table grape, mango orchard and caatinga.|
|Appears in Collections:||Artigo em periódico indexado (CPATSA)|