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      Multiple Scales of Temporal Variability in Ecosystem Metabolism Rates: Results from 2 Years of Continuous Monitoring in a Forested Headwater Stream

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      Ecosystems
      Springer Nature

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          FLUXNET: A New Tool to Study the Temporal and Spatial Variability of Ecosystem–Scale Carbon Dioxide, Water Vapor, and Energy Flux Densities

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            Control of nitrogen export from watersheds by headwater streams.

            A comparative (15)N-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 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.
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              Primary Production in Flowing Waters1

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                Author and article information

                Journal
                Ecosystems
                Ecosystems
                Springer Nature
                1432-9840
                1435-0629
                September 19 2007
                May 30 2007
                : 10
                : 4
                : 588-606
                Article
                10.1007/s10021-007-9059-2
                4c6eb115-cf34-4690-8ea7-e37b12039136
                © 2007
                History

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