I have soil moisture dataset of woodland from four different soil depths like 0-5 cm,5-20cm,20-40 cm and 40-70 cm. I also have rainfall, and other climate data for Hydrus 1d model but I don't have any data about root water uptake. please suggest me what should I can do in place of the trees roots parameters. My woodland have Cypress trees.
Usually water uptake above h 1 and below h 4 is set to zero due to oxygen deficit and wilting point. Between h 2 and h 3 water uptake is maximal (α rw =1). Above h 2 an
A water stress index introduces compensation in root water uptake. See detailed discussion in "Šimůnek, J., and J. W. Hopmans, Modeling compensated root water and nutrient uptake, Ecological Modeling, doi:10.1016/j.ecolmodel.2008.11.004, 220(4), 505-521, 2009." When the index is equal to one, there is no compensation, when it is smaller than one, there is compensation. This option allows the model to consider the fact that at high potential transpiration rates (r2H = 5 mm/day in the model simulation) stomata start to close at lower pressure heads (h2H) (in absolute value) than at low potential transpiration rates (r2L = 1 mm/d) (h2L), and thus an optimal range of pressure heads for root water uptake may vary.
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