Responses of <Emphasis Type="Italic">Avicennia germinans</Emphasis> (Black Mangrove) and the Soil Microbial Community to Nitrogen Addition in a Hypersaline Wetland |
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| Authors: | Dennis F Whigham Jos T A Verhoeven Vladimir Samarkin Patrick J Megonigal |
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| Institution: | (1) Smithsonian Environmental Research Center, Edgewater, MD 21037, USA;(2) Landscape Ecology, Institute of Environmental Biology, Utrecht University, Utrecht, 3508, TB, The Netherlands;(3) Present address: Department of Marine Sciences, University of Georgia, Athens, GA 30602, USA |
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| Abstract: | The responses of dwarf black mangroves (Avicennia germinans) and components of the microbial community to the addition of nitrate over a 2-year period were examined. The field study
was conducted in the Indian River Lagoon (Florida) in a mangrove-dominated impoundment that was established for purposes of
mosquito control. The responses of mangroves to the regular addition of nitrate were insignificant or relatively minor compared
to responses of the components of the microbial community. Denitrification rates, measured in the field and laboratory, increased
significantly in fertilized plots and nitrous oxide emission rates were almost six times higher in fertilized plots. Nitrogen
fixation was significantly lower in fertilized plots. Results suggest that mangrove systems in the N-limited Indian River
Lagoon are likely to be long-term sinks for any increases in N loading. |
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