Sediment nitrogen potential

Tolley MD, DeLaune RD, Patrick WH. The effect of sediment redox potential and soil acidity on nitrogen uptake, anaerobic root respiration, and growth of rice (Oryza saliva). Plant Soil. 1986 93 323-331. 

In shallow, coastal regions runoff from land or movement upward from the sediments are potentially major sources of NFLj, NOs and DON for water column processes. In certain regions, atmospheric deposition (both wet and dry) may also supply bioavailable nitrogen to the system. However, in... 

The abiotic stress affecting microbial activity and growth in an interfacial microenvironment include factors such as light, moisture, temperature, pH, soil/sediment grain size, carbon/nitrogen content, and redox potential [40-43, 46,47,49-51,56-58]. 

Farrias, L. (1998). Potential role of bacterial mats in the nitrogen budget of marine sediments a case of Thioploca sp. Mar. Ecol. Prog. Ser. 170, 291—292. 

Stimson, J., and Lamed, S. T. (2000). Nitrogen efflux from the sediments of a subtropical bay and the potential contribution to macroalgal nutrient requirements.Exp. Mar. Biol. Ecol. 252, 159—180. 

Potential processes that may be called upon to explain the large discrepancy between excess N2 and NOs deficits within the SNM are (1) sedimentary denitrification, (2) anammox, (3) metal (Fe, Mn)-catalyzed denitrification, and (4) non-Redfieldian organic matter mineralization (Codispoti et al., 2001 Devol et al., 2006a,b). The first of these possibilities requires a decoupling between nitrogen and phosphorus cycles (e.g. possible greater burial of phosphorus in continental margin sediments). The less likely additional requirement is that the maximal inputs from the sediments should occur at the same depth as the water column peak of N02. In other words, the exact coincidence of the extrema in NOs , N02, ... 

The insolubility of iron sulfides offers the potential for the burial and mineralization of large amounts of sulfur in sediments. However, sulfur shares with nitrogen a complex organic chemistry, but organosulfur compounds have not always been widely studied. Nevertheless the discovery of large fluxes of DMS to the atmosphere has revealed just how important organosulfur compounds can be. 

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