Differential release of nitrogen and phosphorus from anoxic sediments

Author： Baldwin Darren S. Williams Janice

ISSN： 0275-7540

Source： Chemistry and Ecology, Vol.23, Iss.3, 2007-06, pp. : 243-249

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Abstract

Release of dissolved NH[image omitted] , NOx, filterable reactive P, Fe(II), and S2- from reservoir sediments under anoxic conditions were measured using mesocosms. The sediments were a net sink for NOx, but were a net source of both ammonia and Fe(II). Unexpectedly, the sediments did not release reactive P to any great extent over the 28 d of the experiment. This resulted in an increase in the ratio of dissolved inorganic nitrogen to filterable reactive phosphorus in the overlying water over time. Maintaining a high concentration of dissolved inorganic nitrogen to filterable reactive phosphorus ratios in the overlying water column is a potential method for minimizing the occurrence of cyanobacterial blooms. Therefore, understanding the underlying mechanisms responsible for the retention of P has implications for the ongoing management of the reservoir.