Nitrogen Retention in Headwater Streams: The Influence of Groundwater-Surface Water Exchange
| Autor: | C. S. Fellows, Steven A. Thomas, P. J. Mulholland, Jackson R. Webster, H. M. Valett, C. G. Peterson, C. N. Dahm |
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| Jazyk: | angličtina |
| Rok vydání: | 2001 |
| Předmět: |
Biogeochemical cycle
Article Subject Nitrogen chemistry.chemical_element lcsh:Medicine Fresh Water STREAMS lcsh:Technology General Biochemistry Genetics and Molecular Biology Trees hyporheic zone Rivers Nitrogen Fixation Hyporheic zone Ecosystem lcsh:Science spiraling General Environmental Science Hydrology groundwater-surface water interaction lcsh:T lcsh:R General Medicine Models Theoretical streams Current (stream) chemistry Environmental chemistry North America Solvents Environmental science lcsh:Q Surface water Oxidation-Reduction Groundwater Research Article |
| Zdroj: | The Scientific World Journal, Vol 1, Pp 623-631 (2001) The Scientific World Journal |
| Popis: | Groundwater-surface water (GW-SW) interaction lengthens hydraulic residence times, increases contact between solutes and biologically active surfaces, and often creates a gradient of redox conditions conducive to an array of biogeochemical processes. As such, the interaction of hydraulic patterns and biogeochemical activity is suspected to be an important determinant of elemental spiraling in streams. Hydrologic interactions may be particularly important in headwater streams, where the extent of the GW-SW mixing environment (i.e., hyporheic zone) is proportionately greater than in larger streams. From our current understanding of stream ecosystem function, we discuss nitrogen (N) spiraling, present a conceptual model of N retention in streams, and use both of these issues to generate specific research questions and testable hypotheses regarding N dynamics in streams. |
| Databáze: | OpenAIRE |
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