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A Macroscopic Water Extraction Model for Nonuniform Transient Salinity and Water Stress

^a Dep. of Soil Science, Univ. of Tarbiat Modarres, Tehran 14155-4838, Iran
^b Sub-Dep. of Water Resources, Wageningen Agricultural Univ., Nieuwe Kanaal 11, 6709 PA Wageningen, The Netherlands

View larger version (28K): [in a new window]   Fig. 1. Schematic illustration of reduction functions of (a) Maas and Hoffman; (b) Feddes et al.; (c) direct application of (ho) = 0.8 into no stress part of Feddes et al.; and (d) combined reductions of h and ho.

View larger version (23K): [in a new window]   Fig. 2. Relative transpiration Ta/Tp versus mean |h| for different mean soil solution salinities.

View larger version (19K): [in a new window]   Fig. 3. Comparison between additive (Eq. [3]), multiplicative (Eq. [4], [5], [6], and [7]) and newly proposed reduction function (Eq. [10]) with the experimental data for the salinity of soil solution (ECss) equal to 9 to 11 dS m-1.

View larger version (14K): [in a new window]   Fig. 4. (a) Comparison of Eq. [6] and [10] with the experimental data for the salinity of soil solution (ECss) equal to 9 to 11 dS m-1; (b) comparison between the newly proposed linear and nonlinear functions.