Continental inputs of C, N, P and SI species to the Ría de Vigo (NW Spain)
2005
Gago, J. (Jesús) | Álvarez-Salgado, X.A. (Xosé Antón) | Nieto-Cid, M. (Mar) | Brea, S. (Samanta) | Piedracoba, S. (Silvia)
C, N, P and Si in dissolved, particulate, organic and inorganic forms, determined from 12 surveys in the river Oitabén-Verdugoduring 2002, allowed quantification of the chemical composition, phase partitioning and fluxes of continental materials to the innerRía de Vigo (NW Spain). Despite the large fluxes normalised to the drainage basin of the river Oitabén-Verdugo (280 mmolCm -2 y- 1, 56.5 mmol N m- 2 y -1, 1.35 mmol P m -2 y -1, and 61.3 mmol Si m- 2 y-1), its reduced dimensions (350 km2) yieldedrelatively low concentrations of these species. Organic C, N and P represented 62%, 43% and 48% of the total C, N and P fluxes,respectively. About 90% of the organic C and N and 60% of the organic P was in the dissolved form. The chemical composition ofthe organic materials was compatible with detrital organic matter derived from aquatic plants, phytoplankton and soil leaching butnot with unprocessed terrestrial plants. Significant temporal changes were observed in the chemical composition, related to theseasonal cycle of the biological activity in stream waters and soils, as well as the chemical weathering reactions. Spatial differenceswere due to the contrasting dynamic regime and, likely, the origin of the materials.
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