Fig. 3From: Differential responses of carbon and water vapor fluxes to climate among evergreen needleleaf forests in the USASeasonal changes (8-day averages) of ecosystem water use efficiency (EWUEGPP and EWUENEP) based on gross primary production (GPP) and evapotranspiration (ET) and net ecosystem production (NEP) and ET at ten forest sites, respectivelyBack to article page