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| Titel |
Solute-specific scaling of inorganic nitrogen and phosphorus uptake in streams |
| VerfasserIn |
R. O. Hall, M. A. Baker, E. J. Rosi-Marshall, J. L. Tank, J. D. Newbold |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 11 ; Nr. 10, no. 11 (2013-11-15), S.7323-7331 |
| Datensatznummer |
250085417
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| Publikation (Nr.) |
 copernicus.org/bg-10-7323-2013.pdf |
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| Zusammenfassung |
| Stream ecosystem processes such as nutrient cycling may vary with stream
position in the network. Using a scaling approach, we examined the
relationship between stream size and nutrient uptake length, which represents
the mean distance that a dissolved solute travels prior to removal from the
water column. Ammonium (NH4+) uptake length increased proportionally
with stream size measured as specific discharge (discharge/stream width) with
a scaling exponent = 1.01. In contrast, uptake lengths for nitrate
(NO3−) and soluble reactive phosphorus (SRP) increased more rapidly
than increases in specific discharge (scaling exponents = 1.19 for
NO3− and 1.35 for SRP). Additionally, the ratio of inorganic nitrogen
(N) uptake length to SRP uptake length declined with stream size; there was
relatively lower demand for SRP compared to N as stream size increased.
Finally, we related the scaling of uptake length with specific discharge to
that of stream length using Hack's law and downstream hydraulic geometry.
Ammonium uptake length increased less than proportionally with distance from
the headwaters, suggesting a strong role for larger streams and rivers in
regulating nutrient transport. |
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