Nitrogen retention in headwater streams: the influence of groundwater-surface water exchange.

S. A. Thomas, H. M. Valett, P. J. Mulholland, C. S. Fellows, J. R. Webster, C. N. Dahm, C. G. Peterson

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


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.

Original languageEnglish
Pages (from-to)623-631
Number of pages9
Volume1 Suppl 2
StatePublished - Nov 9 2001


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