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Theoretical Analysis of Soil and Plant Traits Influencing Daily Plant Water Flux on Drying Soils

Agron. Physiol. Lab., P.O. Box 110965, Univ. of Florida, Gainesville, FL 32611-0965

View larger version (23K): [in a new window]   Fig. 1. Graph of relative transpiration rate (RT) calculated for various fractions of transpirable soil water (FTSW) based on assumed leaf water potentials of –1.0, –1.5, or –2.0 MPa. Solid symbols are for cases where the range of transpirable soil was held constant at 0.13. Open symbols are included to show the recalculation of RT when the range of transpirable soil was assumed equal to 0.12 for hydrostatic pressure in leaves during period of active transpiration (leaf) equal to –1.0 MPa and 0.14 for leaf equal to –2.0 MPa.

View larger version (27K): [in a new window]   Fig. 2. Graph of relative transpiration rate calculated as a function of fraction transpirable soil water (FTSW) for 11 soils. The soils varied in textural classification for sand (Sd), silt (Slt), loam (Lm), and clay (Cl).

View larger version (25K): [in a new window]   Fig. 3. Graph of relative transpiration rate calculated as a function of fraction transpirable soil waer (FTSW) for 11 soils. The soils varied in textural classification for sand (Sd), silt (Slt), loam (Lm), and clay (Cl). The total transpirable soil water was adjusted either to 0.10 for three sandy soils or to 0.15 for the silt loam soil.