Abstract
Wetland plant communities in coastal Louisiana are degrading, resulting in the loss of live emergent vegetation and subsequent succession to open water. Saltwater intrusion has resulted from the construction of navigation canals through the marshes; the subsequent salinity increase is one of the potential sources of sublethal stress on plants. Greenhouse experiments were conducted on Spartina patens (Ait.) Muhl. to compare the usefulness of several indicators for the detection of salinity stress. CO 2 uptake, leaf expansion, proline concentration and live aboveground biomass displayed significant responses to the salinity levels employed as treatments (0, 7, 14, 21 and 28 ppt.). CO 2 exchange was the only indicator showing a significant response within 7 days of the initiation of treatments (measurements were made at 7, 14 and 42 days).
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