Stream denitrification across biomes and its response to anthropogenic nitrate loading

Patrick J. Mulholland, Ashley M. Helton, Geoffrey C. Poole, Robert O. Hall, Stephen K. Hamilton, Bruce J. Peterson, Jennifer L. Tank, Linda R. Ashkenas, Lee W. Cooper, Clifford N. Dahm, Walter K. Dodds, Stuart E G Findlay, Stanley V. Gregory, Nancy Grimm, Sherri L. Johnson, William H. McDowell, Judy L. Meyer, H. Maurice Valett, Jackson R. Webster, Clay P. ArangoJake J. Beaulieu, Melody J. Bernot, Amy J. Burgin, Chelsea L. Crenshaw, Laura T. Johnson, B. R. Niederlehner, Jonathan M. O'Brien, Jody D. Potter, Richard W. Sheibley, Daniel J. Sobota, Suzanne M. Thomas

Research output: Contribution to journalArticle

748 Citations (Scopus)

Abstract

Anthropogenic addition of bioavailable nitrogen to the biosphere is increasing and terrestrial ecosystems are becoming increasingly nitrogen-saturated, causing more bioavailable nitrogen to enter groundwater and surface waters. Large-scale nitrogen budgets show that an average of about 20-25 per cent of the nitrogen added to the biosphere is exported from rivers to the ocean or inland basins, indicating that substantial sinks for nitrogen must exist in the landscape. Streams and rivers may themselves be important sinks for bioavailable nitrogen owing to their hydrological connections with terrestrial systems, high rates of biological activity, and streambed sediment environments that favour microbial denitrification. Here we present data from nitrogen stable isotope tracer experiments across 72 streams and 8 regions representing several biomes. We show that total biotic uptake and denitrification of nitrate increase with stream nitrate concentration, but that the efficiency of biotic uptake and denitrification declines as concentration increases, reducing the proportion of in-stream nitrate that is removed from transport. Our data suggest that the total uptake of nitrate is related to ecosystem photosynthesis and that denitrification is related to ecosystem respiration. In addition, we use a stream network model to demonstrate that excess nitrate in streams elicits a disproportionate increase in the fraction of nitrate that is exported to receiving waters and reduces the relative role of small versus large streams as nitrate sinks.

Original languageEnglish (US)
Pages (from-to)202-205
Number of pages4
JournalNature
Volume452
Issue number7184
DOIs
StatePublished - Mar 13 2008

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Denitrification
Nitrates
Ecosystem
Nitrogen
Rivers
Nitrogen Isotopes
Water
Groundwater
Photosynthesis
Budgets
Oceans and Seas
Respiration

ASJC Scopus subject areas

  • General

Cite this

Mulholland, P. J., Helton, A. M., Poole, G. C., Hall, R. O., Hamilton, S. K., Peterson, B. J., ... Thomas, S. M. (2008). Stream denitrification across biomes and its response to anthropogenic nitrate loading. Nature, 452(7184), 202-205. https://doi.org/10.1038/nature06686

Stream denitrification across biomes and its response to anthropogenic nitrate loading. / Mulholland, Patrick J.; Helton, Ashley M.; Poole, Geoffrey C.; Hall, Robert O.; Hamilton, Stephen K.; Peterson, Bruce J.; Tank, Jennifer L.; Ashkenas, Linda R.; Cooper, Lee W.; Dahm, Clifford N.; Dodds, Walter K.; Findlay, Stuart E G; Gregory, Stanley V.; Grimm, Nancy; Johnson, Sherri L.; McDowell, William H.; Meyer, Judy L.; Valett, H. Maurice; Webster, Jackson R.; Arango, Clay P.; Beaulieu, Jake J.; Bernot, Melody J.; Burgin, Amy J.; Crenshaw, Chelsea L.; Johnson, Laura T.; Niederlehner, B. R.; O'Brien, Jonathan M.; Potter, Jody D.; Sheibley, Richard W.; Sobota, Daniel J.; Thomas, Suzanne M.

In: Nature, Vol. 452, No. 7184, 13.03.2008, p. 202-205.

Research output: Contribution to journalArticle

Mulholland, PJ, Helton, AM, Poole, GC, Hall, RO, Hamilton, SK, Peterson, BJ, Tank, JL, Ashkenas, LR, Cooper, LW, Dahm, CN, Dodds, WK, Findlay, SEG, Gregory, SV, Grimm, N, Johnson, SL, McDowell, WH, Meyer, JL, Valett, HM, Webster, JR, Arango, CP, Beaulieu, JJ, Bernot, MJ, Burgin, AJ, Crenshaw, CL, Johnson, LT, Niederlehner, BR, O'Brien, JM, Potter, JD, Sheibley, RW, Sobota, DJ & Thomas, SM 2008, 'Stream denitrification across biomes and its response to anthropogenic nitrate loading', Nature, vol. 452, no. 7184, pp. 202-205. https://doi.org/10.1038/nature06686
Mulholland PJ, Helton AM, Poole GC, Hall RO, Hamilton SK, Peterson BJ et al. Stream denitrification across biomes and its response to anthropogenic nitrate loading. Nature. 2008 Mar 13;452(7184):202-205. https://doi.org/10.1038/nature06686
Mulholland, Patrick J. ; Helton, Ashley M. ; Poole, Geoffrey C. ; Hall, Robert O. ; Hamilton, Stephen K. ; Peterson, Bruce J. ; Tank, Jennifer L. ; Ashkenas, Linda R. ; Cooper, Lee W. ; Dahm, Clifford N. ; Dodds, Walter K. ; Findlay, Stuart E G ; Gregory, Stanley V. ; Grimm, Nancy ; Johnson, Sherri L. ; McDowell, William H. ; Meyer, Judy L. ; Valett, H. Maurice ; Webster, Jackson R. ; Arango, Clay P. ; Beaulieu, Jake J. ; Bernot, Melody J. ; Burgin, Amy J. ; Crenshaw, Chelsea L. ; Johnson, Laura T. ; Niederlehner, B. R. ; O'Brien, Jonathan M. ; Potter, Jody D. ; Sheibley, Richard W. ; Sobota, Daniel J. ; Thomas, Suzanne M. / Stream denitrification across biomes and its response to anthropogenic nitrate loading. In: Nature. 2008 ; Vol. 452, No. 7184. pp. 202-205.
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AU - Tank, Jennifer L.

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AU - Dodds, Walter K.

AU - Findlay, Stuart E G

AU - Gregory, Stanley V.

AU - Grimm, Nancy

AU - Johnson, Sherri L.

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AU - Webster, Jackson R.

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AU - Bernot, Melody J.

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AU - Johnson, Laura T.

AU - Niederlehner, B. R.

AU - O'Brien, Jonathan M.

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