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salinity in sediments of the lower estuary where salinities under 10 were not measured. We further assessed the importance of salinity-mediated desorption by constructing a simple mechanistic numerical model for pore water chloride and NH4+ diffusion for sediments of the upper estuary. The model predicted pore water salinity and NH4+profiles that fit measured profiles very well and described a seasonal pattern of NH4+ flux from the sediment that was significantly affected by salinity. The model demonstrated that changes in salinity on several timescales (tidally, seasonally, and annually) can significantly alter the magnitude and timing of NH4++ release from the sediments. Salinity-mediated desorption and fluxes of NH4+ from sediments in the upper estuary can be of similar magnitude to rates of organic nitrogen mineralization and may therefore be important in supporting estuarine productivity when watershed inputs of N are low.
FingeraftrykDyk ned i forskningsemnerne om 'The Effects of Varying Salinity on Ammonium Exchange in Estuarine Sediments of the Parker River, Massachusetts'. Sammen danner de et unikt fingeraftryk.
- 1 Afsluttet
Banta, G., Giblin, A. & Hopkinson, C. S.
01/03/2006 → 01/03/2008
Projekter: Projekt › Forskning