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Productivity of cordgrass,Spartina alterniflora, estimated from live standing crops, mortality, and leaf shedding in a Virginia salt marsh

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Abstract

Net annual productivity of tall and medium form cordgrass,Spartina alterniflora, was estimated by a new clip sampling method in a sloping foreshore salt marsh at Wallops Island, Virginia. This method measured live standing crops only, to avoid problems of measuring dead biomass inherent in other methods. Losses from live standing crops by shoot mortality and by leaf shedding were estimated from these measurements and added separately to production of live tillers and of live culms. This allowed quantification of various components of production.Spartina tillering in different zones of the marsh produced 62 to 211 g dry weight per m2 per yr. Tiller mortality removed 37 to 106 g per m2 per yr from live standing crops. Culms produced 348 to 1,132 g per m2 before flowering and die-back. Culm mortality removed 28 to 246 g per m2 before flowering. Leaf shedding removed an additional 83 g per m2 in tall formSpartina. Altogether, net annual productivity These estimates are much higher than previous estimates of productivity and standing crops inSpartina marshes nearby.

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  1. Department of Biology, The American University, 20016, Washington, D.C.

    Thomas G. Reidenbaugh

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Reidenbaugh, T.G. Productivity of cordgrass,Spartina alterniflora, estimated from live standing crops, mortality, and leaf shedding in a Virginia salt marsh. Estuaries 6, 57–65 (1983). https://doi.org/10.2307/1351807

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  • DOI: https://doi.org/10.2307/1351807

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