NDLI: Epiphytic nitrogen fixation associated with standing dead shoots of smooth cordgrass, Spartina alterniflora

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Estuaries : Volume 20

Epiphytic nitrogen fixation associated with standing dead shoots of smooth cordgrass, Spartina alterniflora

Content Provider	Springer Nature Link
Author	Currin, Carolyn A. Paerl, Hans W.
Copyright Year	1998
Abstract	N$_{2}$ fixation associated with the epiphytic community on standing dead Spartina alterniflora shoots was examined in both a natural and transplanted salt marsh in North Carolina. Acetylene reduction (AR) assays were conducted over a 24-mo period to estimate N$_{2}$ fixation rates on standing dead stems and leaves. In the natural salt marsh, mean AR rates ranged from 0.5 nmol C$_{2}$H$_{4}$ cm$^{−2}$ h$^{−1}$ to 14 nmol C$_{2}$H$_{4}$ cm$^{−2}$ h$^{−1}$, while in the transplanted marsh mean AR rates ranged from 1 nmol C$_{2}$H$_{4}$ cm$^{−2}$ h$^{−1}$ to 33 nmol C$_{2}$H$_{4}$ cm$^{−2}$ h$^{−1}$. Diel AR activity of epiphytic communities in both marshes varied seasonally. Midday incubations yielded higher AR rates than nighttime incubations in the spring, while midday incubations in late summer and fall generally yielded AR rates equal to or lower than nighttime incubations. Desiccation during low tides occasionally repressed AR activity, although AR rates quickly rebounded with wetting. AR activity was localized in the epiphytic community, rather than in the underlying Spartina stem material. Based on the measured AR rates and the density of standing dead stems, the annual input of new N to the natural salt marsh via epiphytic N$_{2}$ fixation is estimated to be 2.6 g N m$^{−2}$ yr$^{−1}$. The estimate of annual input of new N to the transplanted marsh is 3.8 g N m$^{−2}$ yr$^{−1}$. These estimates should be added to previous estimates of N$_{2}$ fixation in marsh sediments to estimate the total contribution of new nitrogen to salt marsh nitrogen budgets.
Starting Page	108
Ending Page	117
Page Count	10
File Format	PDF
ISSN	01608347
Journal	Estuaries
Volume Number	21
Issue Number	1
Language	English
Publisher	Springer-Verlag
Publisher Date	1998-01-01
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Environment Ecology Geosciences Freshwater & Marine Ecology Environmental Management Nature Conservation
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Aquatic Science Environmental Science

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