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Parameter Estimation of a Root Water Uptake Model under Salinity Stress

^a Univ. of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan
^b School of the Environment, Nanjing Univ., Nanjing 210093, China
^c Arid Land Research Center, Tottori Univ., 1390 Hamasaka, Tottori 680-8550, Japan

View larger version (37K): [in this window] [in a new window]   FIG. 1. Schematic of the experimental setup.

View larger version (21K): [in this window] [in a new window]   FIG. 2. Relationship between dielectric permittivity and water content for Tottori sand.

View larger version (18K): [in this window] [in a new window]   FIG. 3. Dependence of bulk electrical conductivity on water content for Tottori sand. Electrical conductivity of the soil solution was 5.4 dS m–1.

View larger version (16K): [in this window] [in a new window]   FIG. 4. Measured and fitted soil water retention curve (drying).

View larger version (30K): [in this window] [in a new window]   FIG. 5. Time evolution of air temperature, relative humidity, and solar radiation in the greenhouse.

View larger version (18K): [in this window] [in a new window]   FIG. 6. Time evolution of water content.

View larger version (21K): [in this window] [in a new window]   FIG. 7. Time evolution of electrical conductivity of soil solution. Arrows indicate when irrigations were performed.

View larger version (14K): [in this window] [in a new window]   FIG. 8. Distribution of normalized root density for each column.

View larger version (19K): [in this window] [in a new window]   FIG. 9. Time evolution of daily transpiration.

View larger version (22K): [in this window] [in a new window]   FIG. 10. Salinity stress response function for the soybean.

View larger version (18K): [in this window] [in a new window]   FIG. 11. Comparison of measured and calculated ratio of actual to potential daily transpiration.

View larger version (22K): [in this window] [in a new window]   FIG. 12. Examples of the profiles of osmotic head, normalized root density, and sβ (column C) at 12:00 p.m. on August 2 and August 11.