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Phosphorus transport into a stream draining from a mixed land use catchment in Galicia (NW Spain): Significance of runoff events
- Source :
-
Journal of Hydrology . Feb2013, Vol. 481, p12-21. 10p. - Publication Year :
- 2013
-
Abstract
- Summary: In this study the water draining from a mixed land use catchment of 16km2 in NW Spain was monitored over a 5-year period (2004/2005–2008/2009) to determine the temporal variability in phosphorus (P) transport, to examine the P fluxes and controlling factors, and to analyse the relationships between discharge and P (PP: particulate phosphorus and DP: dissolved phosphorus) at event scale. A total of 132 runoff events was analysed, providing an extensive dataset on P values under different hydrological conditions. Mean annual P export from the catchment amounted to 184kg equivalent to 11.5kgkm−2, a value relatively lower than those obtained in other mixed land use catchment. The PP accounted for 74% of the total phosphorus (TP). The intra- and inter-annual variability in P transport was high due to the fact that most of P was discharged during a short-time period: 35% of PP load and 19% of DP load occurred in only 2% of the time. Runoff events contributed to 68% of P exported during the period of study. A high variability in P transport during different runoff events was observed. Phosphorus export increased with the magnitude of runoff events and rainfall amount, suggesting that these could be the key factors controlling P yield. Erosion was also an important driving force behind P export in the catchment. The relationships between PP and DP and discharge resulted in different hysteresis patterns. The relationship PP-discharge was mainly characterised by clockwise behaviour, linked to sediment in the surface runoff, while DP-discharge was predominately anticlockwise due to transport in subsurface flow, showing different pathways of transport between PP and DP. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00221694
- Volume :
- 481
- Database :
- Academic Search Index
- Journal :
- Journal of Hydrology
- Publication Type :
- Academic Journal
- Accession number :
- 85282930
- Full Text :
- https://doi.org/10.1016/j.jhydrol.2012.11.046