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(American Journal of Botany. 1999;86:697-702.)
© 1999 Botanical Society of America, Inc.

Effects of drainage and soil organic content on growth of Spartina alterniflora (Poaceae) in an artificial salt marsh mesocosm1

David E. Padgett2 and Jeffrey L. Brown

Department of Biological Sciences, University of North Carolina, Wilmington, North Carolina 28403;and Department of Mathematical Sciences, University of North Carolina, Wilmington, North Carolina 28403

An artificial salt marsh mesocosm was constructed using 680-L polypropylene tanks to determine the effect of soil drainage depth and organic content on growth and rhizome proliferation of the salt marsh smooth cordgrass Spartina alterniflora. Soil drainage depth had no effect on accumulation of aerial or subsurface plant tissue, but tanks that had 2.5% soil organic content supported enhanced aerial tissue and rhizome growth compared to tanks that contained sand alone. We propose a mathematical model for predicting the mass of photosynthetically significant leaf tissue without cutting and drying leaves. Implications of these findings for salt marsh creation projects are discussed.

Key Words: biomass estimation • drainage • marsh creation • rhizome • soil organics, Spartina alterniflora, Poaceae






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