2024-03-29T05:25:39Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/646832022-12-21T08:20:22Zcom_10261_47com_10261_8col_10261_300
Tidally driven N, P, Fe and Mn exchanges in salt marsh sediments of Tagus estuary (SW Europe)
Caetano, Miguel
Bernárdez, Patricia
Santos-Echeandía, Juan
Prego, R.
Vale, Carlos
Salt marsh
Metals
Nutrients
Advective transport
Diffusive fluxes
12 páginas, 2 tablas, 4 figuras
Short-sediment cores and flooding water were collected at 0, 5, 15, 25 and 50 min of tidal inundation in the two sites colonised by pure stands of Spartina maritima (low marsh) and Sarcocornia fruticosa (high marsh) from the Rosário salt marsh (Tagus estuary, SW Europe). Concentrations of NH 4 + , NO 3 − + NO 2 − and HPO 4 2− , Fe and Mn were measured in tidal flooding water and pore water. Flooding water is enriched in nutrients, particularly ammonium due to local discharge of untreated urban effluents. Nevertheless, NH 4 + and NO 3 − + NO 2 − concentrations in flooding waters at t = 5 min (NH 4 + = 246 ± 7 μM, NO 3 − + NO 2 − = 138 ± 1 μM for S. fruticosa and NH 4 + = 256 ± 8 μM, NO 3 − + NO 2 − = 138 ± 1 μM for S. maritima) rose sharply at both vegetated sites. An increase was also registered for HPO 4 2− and total dissolved Fe although the subsequent decrease was smoother. Advective transport induced by the two daily pulses of inundation is several orders of magnitude higher than the diffusive fluxes during submerged periods. In addition, solutes are exported from the sediment with the inundation and imported in submerged periods. The exported amount of inorganic nitrogen during tidal inundation (export of 3,200 μmol N m−2 day−1to the water column), is not counterbalanced by the sink of −290 μmol N m−2 day−1 occurred during the submerged period
Juan Santos-Echeandia thanks
the Basque Government for the financial support (post-doctoral
grant). This article is a contribution to the Spanish–Portuguese
Actions of references 2007PT0021 and FCT/CSIC9/CSIC/08.
Peer reviewed
2013-01-22T11:38:27Z
2013-01-22T11:38:27Z
2012
artículo
http://purl.org/coar/resource_type/c_6501
Environmental Monitoring and Assessment 184(119): 6541-6552 (2012)
0167-6369
http://hdl.handle.net/10261/64683
10.1007/s10661-011-2439-2
1573-2959
en
http://dx.doi.org/10.1007/s10661-011-2439-2
none
Springer