The Relationship between Soil Water Potential and Plant Water Potential in Two Inland Halophytes Under Field Conditions

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Abstract
Field investigations were carried out to determine the relationship between soil water and plant water potentials for 2 halophytic spp. Salicornia europaea, a halophyte with succulent stems, grew on the most saline sites with soil water potentials averaging -37.8 .+-. 4.0 bars, ranging from -16.0 bars to -100.0 bars. Atriplex triangularis grew in less saline locations with soil water potentials averaging -29.3 .+-. 5.1 bars, ranging from -2.7 bars to -50.7 bars. Shoot water potentials of S. europaea were low, -65.3 bars, even when plants grew under moderately saline conditions, -16.0 bars, whereas in A. triangularis there was a highly significant correlation, r = .90, between decreasing soil water potentials and decreasing leaf water potentials.