Benthic denitrification and organic matter mineralization in intertidal flats of an enclosed coastal inlet, Ago Bay, Japan |
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| Authors: | Patel Arun Bhai |
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| Institution: | Mie Industry and Enterprise Support Center, CREATE, Core Research Laboratory, Shima shi, Ago Cho, Ugata 3098-9, Mie, Japan. patel@miesc.or.jp |
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| Abstract: | Denitrification (as N(2) flux) and organic matter mineralization (as O(2) uptake) were simultaneously measured in the same set of core sediments from a natural sandy and a constructed muddy tidal flat of Ago Bay, Japan. Denitrification rates at both tidal flats fluctuated between ca. 2-20 micromol N(2)m(-2)h(-1) without showing a clear seasonal pattern, and appeared to be substrate limited as NO(3)(-) enrichment (final concentration ca. 225 microM) caused prompt and similar enhancements of ca. 10-folds. Organic matter mineralization rates were markedly higher at constructed muddy flat compared to those of natural sandy flat, especially in summer, and exhibited pronounced temperature dependent (p<0.01) seasonality for both tidal flats. O(2) uptake rates were generally ca. 2-3 order greater than respective denitrification rates indicating dominance of mineralization processes over N(2) losses. |
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