VEGETATION ZONATION AS RELATED TO THE SALT TOLERANCE OF SPECIES OF BRACKISH RIVERBANKS

Nine riverbank species were grown in a range of salinities to estimate salt tolerances. These tolerances, and others calculated from previou s studies, are compared with the species' distributions upstream-downs tream and upshore-downshore on brackish riverbanks. Downstream and dow nshore limits could predict the salt tolerance of the species, togethe r accounting for 64% of the variation. Upstream and upshore limits acc ounted for 58%, but the relation with upstream limits was not statisti cally significant. There was a continuous range of tolerances.