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| Titel |
Temporal variability in phosphorus transfers: classifying concentration–discharge event dynamics |
| VerfasserIn |
P. Haygarth, B. L. Turner, A. Fraser, S. Jarvis, T. Harrod, D. Nash, D. Halliwell, T. Page, K. Beven  |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 8, no. 1 ; Nr. 8, no. 1, S.88-97 |
| Datensatznummer |
250005387
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| Publikation (Nr.) |
 copernicus.org/hess-8-88-2004.pdf |
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| Zusammenfassung |
| The importance of temporal variability in relationships between phosphorus
(P) concentration (Cp) and discharge (Q) is linked to a simple means of
classifying the circumstances of Cp–Q relationships in terms of functional types
of response. New experimental data at the upstream interface of grassland soil and catchment
systems at a range of scales (lysimeters to headwaters) in England and Australia are used
to demonstrate the potential of such an approach. Three types of event are defined as Types
1–3, depending on whether the relative change in Q exceeds the relative change in
Cp (Type 1), whether Cp and Q are positively inter-related (Type 2)
and whether Cp varies yet Q is unchanged (Type 3). The classification helps to
characterise circumstances that can be explained mechanistically in relation to (i) the
scale of the study (with a tendency towards Type 1 in small scale lysimeters), (ii) the
form of P with a tendency for Type 1 for soluble (i.e., <0.45 μm P forms) and (iii) the
sources of P with Type 3 dominant where P availability overrides transport controls. This
simple framework provides a basis for development of a more complex and quantitative
classification of Cp–Q relationships that can be developed further to
contribute to future models of P transfer and delivery from slope to stream. Studies that
evaluate the temporal dynamics of the transfer of P are currently grossly
under-represented in comparison with models based on static/spatial factors.
Keywords: phosphorus, concentration, discharge, lysimeters, temporal dynamics, overland
flow |
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