Abstract
Salinities greater than 35 ppt and completely submerged conditions reduced growth of Sarcocornia perennis (Mill.) A.J. Scott, an important intertidal salt marsh macrophyte occurring in a number of South African estuaries. Highest mortality of S. perennis plants occurred with the submerged treatments. Plants grew best under water-saturated soil conditions at salinity values between 0 and 15 ppt. Sarcocornia perennis plants submerged initially at approximately 5 cm below the water surface showed rapid stem elongation above the surface. Succulent leaves below the water decomposed and this was more rapid in low salinity treatments. Inundated conditions will also prevent flowering and seed production, thus reducing the potential for recruitment of new plants when water levels eventually subside.
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