The Scientific World Journal

The Scientific World Journal / 2001 / Article
Special Issue

Optimizing Nitrogen Management in Food and Energy Production and Environmental Protection: 2nd International Nitrogen Conference 2001

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Research Article | Open Access

Volume 1 |Article ID 170302 |

S.A. Thomas, H.M. Valett, P.J.. Mulholland, C.S. Fellows, J.R. Webster, C.N. Dahm, C.G Peterson, "Nitrogen Retention in Headwater Streams: The Influence of Groundwater-Surface Water Exchange", The Scientific World Journal, vol. 1, Article ID 170302, 9 pages, 2001.

Nitrogen Retention in Headwater Streams: The Influence of Groundwater-Surface Water Exchange

Academic Editor: Joe Wisniewski


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.

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