Evapotranspiration estimation by micrometeorological techniques throughthe assessment of mass and energy exchanges in the soil-plant-atmospherecontinuum (SPAC) is a very active research area, involving both well-known andnovel measurement techniques. A crucial aspect in validating experimental results isthe integration of independent measurements of mass and energy exchanges in theSPAC. To this aim, the development and validation of an integrated approach inmajor tree crop species, involving different independent techniques, are presented.Eddy covariance estimates of ET fluxes were compared to up-scaled sap flowmeasurements in olive, orange and grapevine, three important Mediterranean treecrop species with contrasting ecophysiological characteristics and responses to waterdeficits. These differences can affect directly the degree of coupling of the tree to theenvironment and, consequently, the degree of correspondence betweeninstantaneous transpirational flux at tree level and the micrometeorologicalmeasurement of ET at orchard level. Data were analyzed to verify to what extent, inthe three species, transpirational flow at orchard level is regulated by treeconductance, capacitance effects related to tree size or by environmental demand.Hourly observations were helpful in detecting physiological processes of the threespecies only when data were analyzed taking into consideration their diurnalchanges.
|Numero di pagine||7|
|Stato di pubblicazione||Published - 2012|
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