Eutrophication and the rate of denitrification and N20 production in coastal marine sediments
TLDR
In this article, the effect of nutrient loading and eutrophication in coastal marine ecosystems on the rates of benthic denitrification and N/sub 2/O production was measured.Abstract:
Large (13 m/sup 3/, 5 m deep) microcosms with coupled pelagic and benthic components were used to measure the effect of nutrient loading and eutrophication in coastal marine ecosystems on the rates of benthic denitrification (N/sub 2/) and N/sub 2/O production. After 3 months or daily nutrient addition, average denitrification rates ranged from about 300 ..mu..mol N m/sup -2/ h/sup -1/ in the sediments of the control microcosm to 880 in the most enriched microcosm, which received 65 times the nutrient input of the control. Increases in the production of N/sub 2/O were more dramatic and increased by a factor of about 100, from 0.56 ..mu..mol N m/sup -2/ h/sup -1/ in the control to 51 in the most enriched microcosm. Although there was a clear increase in the denitrification rate in the more eutrophic systems, the amount of fixed nitrogen removed was a constant or progressively smaller fraction of the nitrogen input. Even in the most enriched microcosm, at least 16% of the N input was removed by denitrification.read more
Citations
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Denitrification in freshwater and coastal marine ecosystems: Ecological and geochemical significance
TL;DR: Denitrification occurs in essentially all river, lake, and coastal marine ecosystems that have been studied as discussed by the authors, and the major source of nitrate for denitrification in most river and lake sediments underlying an aerobic water column is nitrate produced in the sediments, not nitrate diffusing into the overlying water.
Journal ArticleDOI
Nitrogen cycling in coastal marine ecosystems.
TL;DR: The physico-chemical and biological factors regulating nitrogen cycling in coastal marine ecosystems are considered in relation to developing effective management programmes to rehabilitate seagrass communities in lagoons currently dominated by pelagic macroalgae and/or cyanobacteria.
Journal ArticleDOI
Couplings of watersheds and coastal waters: sources and consequences of nutrient enrichment in Waquoit Bay, Massachusetts
Ivan Valiela,Kenneth H. Foreman,Michael G. LaMontagne,Douglas Hersh,Joseph E. Costa,Paulette Peckol,Barbara DeMeo-Andreson,Charlene D'Avanzo,Michele Babione,Chi-Ho Sham,John W. Brawley,Kate Lajtha +11 more
TL;DR: In this paper, a series of subwatersheds of Waquoit Bay was studied to investigate the coupling of land to marine systems, and it was found that the increased macroalgal biomass dominates the bay ecosystem through second or third-order effects such as alterations of nutrient status of water columns and increasing frequency of anoxic events.
Journal ArticleDOI
Global distribution of nitrous oxide production and N inputs in freshwater and coastal marine ecosystems
TL;DR: In this paper, the authors examined N2O emissions from aquatic environments globally, particularly as they are affected by anthropogenic activity, and the global distribution of N 2O production in rivers and estuaries was modeled as a function of nitrification and denitrification rates, which were related to external nitrogen (N) inputs.
Journal ArticleDOI
Nitrogen biogeochemistry of aquaculture ponds
TL;DR: Nitrogen (N) biogeochemistry of aquaculture ponds is dominated by biological transformations of N added to ponds in the form of inorganic or organic fertilizers and formulated feeds, although cyanobacterial nitrogen fixation and atmospheric deposition are occasionally important.
References
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