Publication: Morfología Fluvial.-Obtención de la conductancia de la vegetación a partir de índices espectrales y temperatura superficial para la estimación de la evapotranspiración en vegetación semiárida
Authors
Morillas, L. ; García, M. ; Zarco-Tejada, P. ; Ladrón de Guevara, M. ; Villagarcía, L. ; Were, P. ; Domingo, F.
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Universidad de Murcia
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DOI
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info:eu-repo/semantics/other
Description
Abstract
This work evaluates the possibilities for estimating stomatal conductance (C) and leaf
transpiration (Trf) at the ecosystem scale from radiometric indices and surface
temperature. The relationships found between indices and the transpiration component
of the water balance in a semiarid tussock ecosystem in SE Spain are discussed. Field
data were collected from spring 2008 until winter 2009 in order to observe the annual
variability of the relationships and the behaviour of spectral indices and surface
temperature. The results showed that best relationships with leaf transpiration were
found with the PRI index and the Red-Green ratio (r2 > 0.86 for both), and with the
vegetation temperature minus the air temperature (Tc – Ta) (r2= 0.54). For stomatal
conductance, several indices showed good agreement (r2 > 0.7) with measurements,
TCARI/OSAVI, NDWI, SRWI, R760 / R500 and R800 / R470 indices. These results showed
the applicability of remote sensing data to monitor complex ecophysiological variables
at field scale.
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