Fig. 1: Conceptual diagram of relationship between soil moisture and gross primary productivity (GPP).
From: Evidence for the acclimation of ecosystem photosynthesis to soil moisture
The green vertical line indicates optimum soil moisture for GPP (\({{\rm{SM}}}^{{\rm{GPP}}}_{{\rm{opt}}}\)). An increase in soil moisture increases GPP when the soil moisture is below \({{\rm{SM}}}^{{\rm{GPP}}}_{{\rm{opt}}}\), but decreases GPP when the soil moisture is above \({{\rm{SM}}}^{{\rm{GPP}}}_{{\rm{opt}}}\).
