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Title

Carbon and nitrogen stoichiometry and nitrogen cycling rates in streams

AuthorsDodds, W. K.; Martí, Eugènia ; Tank, J. L.; Pontius, J.; Hamilton, S. K.; Grimm, N. B.; Bowden, W. B.; McDowell, W. H.; Peterson, B. J.; Valett, H. M.; Webster, J. R.; Gregory, S. V.
KeywordsCarbon
Carbon:Nitrogen ratio
Nitrogen
Stoichiometry
Streams
Issue Date4-Jun-2004
PublisherSpringer
CitationOecologia 140(3) : 458-467 (2004)
AbstractStoichiometric analyses can be used to investigate the linkages between N and C cycles and how these linkages influence biogeochemistry at many scales, from components of individual ecosystems up to the biosphere. N-specific NH4 + uptake rates were measured in eight streams using short-term 15N tracer additions, and C to N ratios (C:N) were determined from living and non-living organic matter collected from ten streams. These data were also compared to previously published data compiled from studies of lakes, ponds, wetlands, forests, and tundra. There was a significant negative relationship between C:N and N-specific uptake rate; C:N could account for 41% of the variance in N-specific uptake rate across all streams, and the relationship held in five of eight streams. Most of the variation in N-specific uptake rate was contributed by detrital and primary producer compartments with large values of C:N and small values for N-specific uptake rate. In streams, particulate materials are not as likely to move downstream as dissolved N, so if N is cycling in a particulate compartment, N retention is likely to be greater. Together, these data suggest that N retention may depend in part on C:N of living and non-living organic matter in streams. Factors that alter C:N of stream ecosystem compartments, such as removal of riparian vegetation or N fertilization, may influence the amount of retention attributed to these ecosystem compartments by causing shifts in stoichiometry. Our analysis suggests that C:N of ecosystem compartments can be used to link N-cycling models across streams.
Description10 Páginas ; 4 Tablas ; 3 Figuras
Publisher version (URL)http://dx.doi.org/10.1007/s00442-004-1599-y
URIhttp://hdl.handle.net/10261/37392
DOIhttp://dx.doi.org/10.1007/s00442-004-1599-y
ISSN0029-8549
Appears in Collections:(CEAB) Artículos
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