Control of nitrogen export from watersheds by headwater streams

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TitleControl of nitrogen export from watersheds by headwater streams
Publication TypeJournal Article
Year of Publication2001
AuthorsPeterson, BJ, Wollheim, WM, Mulholland, PJ, Webster, JR, Meyer, JL, Tank, JL, Marti, E, Bowden, WB, Valett, HM, Hershey, AE, McDowell, WH, Dodds, WK, Hamilton, SK, Gregory, SV, Morrall, DD
JournalScience
Volume292
Issue5514
Pagination86-90.
Accession NumberARC347
Abstract

A comparative 15N-tracer study of nitrogen dynamics in headwater streams from biomes throughout North America demonstrates that streams exert control over nutrient exports to rivers, lakes, and estuaries. The most rapid uptake and transformation of inorganic nitrogen occurred in the smallest streams. Ammonium entering these streams was removed from the water within a few tens to hundreds of meters. Nitrate was also removed from stream water but traveled a distance of 5 to 10 times as long, on average, as ammonium. Despite low ammonium concentration in stream water, nitrification rates were high, indicating that small streams are potentially important sources of atmospheric nitrous oxide. During seasons of high biological activity, the reaches of headwater streams typically export downstream less than half of the input of dissolved inorganic nitrogen from their watersheds.

DOI10.1126/science.1056874
Short TitleControl of nitrogen export from watersheds by headwater streams