Publication: Relaciones agua-suelo-vegetación.-Influence of soil moisture on the modelling of evapotranspiration in sparse vegetation
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Sánchez Navarro, Antonio ; Fernández-Delgado Juárez, M. ; Gil Vázquez, J.M. ; García González, M. ; Blanco Bernardeau, M.A.
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Universidad de Murcia
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Publisher
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DOI
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info:eu-repo/semantics/other
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Abstract
ABSTRACT
This work analyses the relevance of soil water content (θ) on the estimation of actual
evapotranspiration (λE) in sparse vegetated areas. This importance is evaluated through the
effect of the θ heterogeneity, both vertical and horizontal (differentiating between bare soil
(bs) and soil under vegetation (s)), on λE estimates. A clumped evapotranspiration model
(CM) that considers vegetation (p), bs and s as sources of evaporation, was used. This
model estimates λE of the whole vegetated area, as well as the contribution of each source.
The field site is a sparse-vegetated patch of Anthyllis cytisoides (L.) located in the
instrumental area of Rambla Honda in Tabernas (Almería), run by the Arid Zones
Experimental Station (CSIC).
Values of θ measured at three depths (0.02 m, 0.05 m and 0.15 m) and the averaged for the
whole 0.15 m soil profile were used to calculate parametric equations of surface soil
resistances bs
rs and s
rs and the surface leaf conductance ls
g . The parametric equations were
introduced in the CM and the λE estimates obtained were compared with measured values
from an Eddy covariance system. Results showed that θ has an important effect on the
estimates of bs and s contributions. The modelled λE that provided the best results were
obtained when bs
rs and s
rs were parameterised with θ measured at the surface at 0.02 m
(RMSE = 0.2 mm day-1), while the worst estimates were obtained when using θ measured
deeper (RMSE = 0.75 mm day-1).
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