Nitrogen flux sediments

Gardner, W.S., Escobar-Broines, E., Cruz-Kaegi, E., and Rowe, G.T. (1993) Ammonium excretion by benthic invertebrates and sediment-water nitrogen flux in the Gulf of Mexico near the Mississippi River outflow. Estuaries 16, 799-808. 

Rivera-Monroy, V.H., Day, J.D., Twilley, R.R., Vera-Herrera, F., and Coronado-Molina, C. (1995) Flux of nitrogen and sediments in a fringe mangrove forest in terminus Lagoon, Mexico. Estuar. Coastal Shelf Sci. 40, 139-160. 

Cabrita, M. T., andBrotas, V. (2000). Seasonal variation in denitrification and dissolved nitrogen fluxes in intertidal sediments of the Tagus Estuary. Mar. Ecol. Prog. Ser. 202, 51—65. 

DahUof, I., and Karle, I. M. (2005). Effect on marine sediment nitrogen fluxes caused by org c matter enrichment with varying organic carbon structure and nitrogen content. Mar. Chem. 94,17—26. 

Sundback, K., Miles, A., and Goransson, A. (2000). Nitrogen fluxes, denitrification and the role of microphytobenthos in microtidal shaUow-water sediments An annual study. Mar. Ecol. Prog. Ser. 200, 59-76. 

Kaspar H. F., Asher R. A., and Boyer 1. C. (1985) Microbial nitrogen transformations in sediments and inorganic nitrogen fluxes across the sediment/water interface on the South Island West Coast, New Zealand. Estuar. Coast. Shelf Sci. 21, 245-255. 

Trimmer M., Nedwell D. B., Sivyer D. B., and Malcolm S. J. (1998) Nitrogen fluxes through the lower estuary of the river Great Ouse, England the role of bottom sediments. Mar. Ecol. Prog. Ser. 163, 109-124. 

Table 2.14. The exchange flux (mniol/(m d)) of nitrogen at sediment-water interface in the Bohai Sea (Zhang et ah, 2004) (With permission from Elsevier s Copyright...

Eutrophication reduces the 02 content and increases the presence of NH4 in freshwater. These changes can affect the processes of transformation of carbon and nitrogen giving CH4 and N20, which are emitted to the atmosphere. Liikanen and Martikainen (2003) studied these processes in Finland and showed that in the case of a eutrophicated lake the bottom sediment can emit up to 7.9 mmol m-2 da-1 of CH4 and 7.6 pmol m 2 da 1 of N20, with oxygen being a key factor in the regulation of these fluxes through N03 formation. 

Of the organic carbon entering the ocean, about 35% accumulated in marine sediments as organic carbon with a molar C/N/P ratio of about 250/20/1 (Mackenzie, 1981) the rest was respired and oxidized to CO2 and evaded the ocean. The nitrogen and phosphorus riverine fluxes of 1 and 0.045 x 1012 moles y1, respectively, represented the nutrient fluxes necessary to support the organic matter accumulation of 11.7 x 1012 moles C y1. 

Figure 8.5 Experimental fluxes of NELt-1-, NO3U dissolved organic nitrogen (DON), urea, dissolved free amino acids (DFAA), and dissolved combined amino acids (DCAA) across the sediment-water interface in cores collected in Hog Island Bay (USA). (Modified from Tyler et al., 2003.)...

Devol, A.H. (1991) Direct measurement of nitrogen gas fluxes from continental shelf sediments. Nature. 349 319-321. 

Gardner, W.S., Seitzinger, S.P., and Malczyk, J.M. (1991) The effects of sea salts on the forms of nitrogen released from estuarine and freshwater sediments does ion pairing affect ammonium flux Estuaries 14, 157-166. 

Kristensen, E. (1988) Benthic fauna and biogeochemical processes in marine sediments microbial activities fluxes. In Nitrogen Cycling in Coastal Marine Environments. SCOPE (Blackburn, T.H., and Sprensen, J., eds.), pp. 275-299, Scope, Chichester, UK. 

Tyler, A.C., McGlathery, K.J., and Anderson, I.C. (2003) Benthic algae control sediment-water column fluxes of organic and inorganic nitrogen compounds in a temperate lagoon. Limnol. Oceanogr. 48, 2125-2137. 

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