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. Dehesa ecosystem consists of widely-spaced oak trees combined withcrops, pasture and Mediterranean shrubs. It is located in the southwest ofthe Iberian Peninsula, where water scarcity is recurrent, severely affectingthe multiple productions and services of the ecosystem. Upscaling in situGross Primary Production (GPP) estimates in these areas is challenging forregional and global studies, given the significant spatial variability ofplant functional types and the vegetation stresses usually present. Theestimation of GPP is often addressed using light use efficiency models(LUE-models). Under soil water deficit conditions, biomass production isreduced below its potential rate. This work investigates the effect ofdifferent parameterizations to account for water stress on GPP estimates andtheir agreement with observations. Ground measurements of GPP are obtainedusing an Eddy Covariance (EC) system installed over an experimental sitelocated in Cordoba, Spain. GPP is estimated with a LUE-model in thefootprint of the EC tower using several approaches: a fixed value taken fromprevious literature; a fixed value modified by daily weather conditions; andboth formulations modified by an additional coefficient to explicitlyconsider the vegetation water stress. The preliminary results obtained duringtwo hydrological years (2015/2016 and 2016/2017) are compared, focusing onspecific wet and dry periods.

Effect of the water stress on gross primary production modeling of a Mediterranean oak savanna ecosystem