A macroscopic sink term for root water extraction based on an analysis of radial water flow to roots that was recently introduced by de Jong van Lier et al. (2008) implicitly accounts for so-called “compensatory uptake.” I will demonstrate that the model described by de Jong van Lier et al. (2008) shares the same conceptual basis, and can be expressed in mathematically identical form, as the empirical sink term for root water uptake that I proposed 20 yr ago (Jarvis, 1989). Thus, one important benefit of the physics-based approach is that the dimensionless parameters in the empirical form...

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