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Título: | Relaciones agua-suelo-vegetación.-Influence of soil moisture on the modelling of evapotranspiration in sparse vegetation |
Fecha de defensa / creación: | sep-2009 |
Materias relacionadas: | CDU::5 - Ciencias puras y naturales::55 - Geología. Meteorología |
Palabras clave: | Clumped model surface resistances parameterization soil water content |
Resumen: | 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). |
Autor/es principal/es: | Sánchez Navarro, Antonio Fernández-Delgado Juárez, M. Gil Vázquez, J.M. García González, M. Blanco Bernardeau, M.A. |
Facultad/Departamentos/Servicios: | Universidad de Murcia |
Forma parte de: | Congreso Internacional sobre desertificación |
URI: | http://hdl.handle.net/10201/97827 |
Tipo de documento: | info:eu-repo/semantics/other |
Número páginas / Extensión: | 4 |
Derechos: | info:eu-repo/semantics/openAccess Attribution-NonCommercial-NoDerivatives 4.0 International |
Aparece en las colecciones: | Congreso Internacional sobre Desertificación. |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
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Influence of soil moisture on the modelling of evapotranspiration ....pdf | 327,52 kB | Adobe PDF | Visualizar/Abrir |
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