In his comment, Jarvis presented a comparison between the Jarvis (1989) empirical root water extraction model and the de Jong van Lier et al. (2008) model with a more physical basis. The Jarvis (1989) model has been cited in many other studies related to root water extraction and its modeling, recently by, e.g., Schröder et al. (2008) and Šimůnek and Hopmans (2009).

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The mathematical comparison shows that both models assume the same decline and vertical distribution of root water uptake under water stress, while in no-stress situations there is a difference in the vertical distribution of root water...

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