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3D distribution of cumulative water uptake density (WUD, cm3 cm−3 d−1), water depletion (WD, cm3 cm−3), and Gd-DTPA2− accumulation (Acc., mmol l−1) for the optimal root hydraulic properties. WD represents the variation of water content, Acc. represents the increase of tracer concentration. All data are from the non-leaching period only (24–25 d after sowing).
