Differential effects of salinity and soil saturation on native and exotic plants of a coastal salt marsh

  • Published source details Kuhn N.L. & Zedler J.B. (1997) Differential effects of salinity and soil saturation on native and exotic plants of a coastal salt marsh. Estuaries, 20, 391.


This study is summarised as evidence for the following.

Action Category

Add salt to control problematic plants: brackish/salt marshes

Action Link
Marsh and Swamp Conservation
  1. Add salt to control problematic plants: brackish/salt marshes

    A replicated, randomized, paired, controlled, before-and-after study in 1994–1995 in an estuarine salt marsh in California, USA (Kuhn & Zedler 1997) found that adding salt to control invasive annual beardgrass Polypogon monspeliensis had no significant effect on the height of the native dominant glasswort Salicornia subterminalis. Over three months, glasswort plants were a similar height in plots with or without added salt (salt: 31–34 cm; no salt: 32–34 cm). The same was true before intervention (salt: 31–34 cm; no salt: 33 cm). After three months, there were fewer beardgrass shoots in plots with added salt than plots without (data reported as density classes). Methods: In December 1994, thirty-two 1-m2 plots were established (in eight sets of four) on a beardgrass-invaded, intertidal salt marsh. Between December and February, sea salt was sprinkled onto the surface of 24 plots. One random plot/set received each monthly dose: 850 g, 1,700 g or 3,400 g. No salt was added to the final eight plots. Vegetation was surveyed before salt additions began (December 1994) and for three months after (January-March 1995). Three individual glasswort plants/plot were measured throughout the study.

    (Summarised by: Nigel Taylor)

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