Observed and predicted soil moisture (g g-1) across the soil profile.

Soil moisture content was observed using continuous measurements of volumetric water content and soil water potential in one soil pit at the study site. Soil water content was predicted using the Hydrus 1D soil water model parameterized with tracer-derived estimates of plant root distributions (R2 = 0.84). Observed and predicted values for target depths shown in S5 Fig.