Sediment addition enhances transpiration and growth of Spartina alterniflora in deteriorating Louisiana Gulf Coast salt marshes

  • Published source details Pezeshki S.R., DeLaune R.D. & Pardue J.H. (1992) Sediment addition enhances transpiration and growth of Spartina alterniflora in deteriorating Louisiana Gulf Coast salt marshes. Wetlands Ecology and Management, 1, 185-189.


This study is summarised as evidence for the following.

Action Category

Add sediment: brackish/salt marshes

Action Link
Marsh and Swamp Conservation
  1. Add sediment: brackish/salt marshes

    A replicated, randomized, paired, controlled study in 1986–1988 in a subsiding tidal salt marsh in Louisiana, USA (Pezeshki et al. 1992) found that adding sediment increased smooth cordgrass Spartina alterniflora density and biomass. Twenty-two months after the first amendment, plots amended with sediment contained more cordgrass stems (high dose: 50 stems/m2; low dose: 42 stems/m2) than unamended plots (19 stems/m2). The above-ground biomass of smooth cordgrass was also greater in amended plots (high dose: 381 g/m2; low dose: 321 g/m2) than unamended plots (160 g/m2). Methods: In July 1986, twelve 1.44-m2 plots were established (in four sets of three) on a degraded, cordgrass-dominated salt marsh. Four plots received each sediment dose: high (94 kg/m2), low (47 kg/m2) or none. Sediment was dredged river alluvium. Half was added to each amended plot in July 1986 and half in June 1987. In April 1988, vegetation was cut from two 0.25-m2 quadrats/plot, then dried and weighed. This study was based on the same experimental set-up as (1).

    (Summarised by: Nigel Taylor)

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