EDAFOLOGÍA, VOL 14. (1, 2, 3), PP 49-54 2007
CONTRIBUCIÓN DE SURCOS Y CÁRCAVAS EFÍMERAS A LA PRODUCCIÓN DE
SEDIMENTOS Y FÓSFORO EN UNA CUENCA AGROFORETAL
M.L. Rodríguez-Blanco, M.M. Taboada-Castro, M.T. Taboada-Castro1
Facultad de Ciencias, Universidad de A Coruña, A Zapateira,
15071 A Coruña, España. [email protected]
This work examines the evolution of the concentrations
of sediment suspension (SS) and particulate (PP) and dissolved phosphorus (PD)
during four runoff events in a small stream that drains an agroforestry catchment
(NW Spain). Both the SS, as the PP and DP were increase during the events.
The highest concentrations were reached before the flow peak, excluding DP
concentrations that were obtained after the flow peak probably associated with
the subsurface flow.
The PP, which represents more than 80% of total, showed a significant correlation
with SS in all events. Suspended sediment and PP maximum concentrations as
well as SS and PP load showed marked differences between events. Suspended
sediment exported ranged between 19.66 and 483.23 kg/km2, while the PP varied
between 0.03 and 0.41 kg/km2. Rills and ephemeral gullies developed in cultivated
land were the main sources of sediment delivered to the stream.
Key Words: suspended sediment, phosphorus, exportation, events, erosion, agroforestry
catchment.