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Sources and fates of dissolved organic carbon in lakes as determined by whole-lake carbon isotope additions

Bade, Darren L. ; Carpenter, Stephen R. ; Cole, Jonathan J. ; Pace, Michael L. ; Kritzberg, Emma LU ; Van de Bogert, Matthew C. ; Cory, Rose M. and McKnight, Diane M. (2007) In Biogeochemistry 84(2). p.115-129
Abstract
Four whole- lake inorganic C-13 addition experiments were conducted in lakes of differing trophic status. Inorganic C-13 addition enriched algal carbon in C-13 and changed the delta C-13- DOC by + 1.5 parts per thousand to + 9.5 parts per thousand, depending on the specific lake. This change in delta C-13- DOC represented a significant input of algal DOC that was not completely consumed by bacteria. We modeled the dynamics in delta C-13- DOC to estimate the fluxes of algal and terrestrial carbon to and from the DOC pool, and determine the composition of the standing stock. Two experiments in lightly stained, oligotrophic lakes indicated that algal production was the source of about 20% of the DOC pool. In the following year, the experiment... (More)
Four whole- lake inorganic C-13 addition experiments were conducted in lakes of differing trophic status. Inorganic C-13 addition enriched algal carbon in C-13 and changed the delta C-13- DOC by + 1.5 parts per thousand to + 9.5 parts per thousand, depending on the specific lake. This change in delta C-13- DOC represented a significant input of algal DOC that was not completely consumed by bacteria. We modeled the dynamics in delta C-13- DOC to estimate the fluxes of algal and terrestrial carbon to and from the DOC pool, and determine the composition of the standing stock. Two experiments in lightly stained, oligotrophic lakes indicated that algal production was the source of about 20% of the DOC pool. In the following year, the experiment was repeated in one of these lakes under conditions of nutrient enrichment, and in a third, more humic lake. Algal contributions to the DOC pool were 40% in the nutrient enriched lake and 5% in the more humic lake. Spectroscopic and elemental analyses corroborated the presence of increased algal DOC in the nutrient enriched lake. Natural abundance measurements of the delta C-13 of DOC in 32 lakes also revealed the dual contributions of both terrestrial and algal carbon to DOC. From these results, we suggest an approach for inferring the contribution of algal and terrestrial DOC using easily measurable parameters. (Less)
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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
carbon stable isotopes, allochthonous, autochthonous, carbon, dissolved organic
in
Biogeochemistry
volume
84
issue
2
pages
115 - 129
publisher
Springer
external identifiers
  • wos:000247385100001
  • scopus:34249790161
ISSN
1573-515X
DOI
10.1007/s10533-006-9013-y
language
English
LU publication?
yes
id
9fe9b771-7dbc-4c10-9630-be8850584dd8 (old id 648597)
date added to LUP
2016-04-01 12:19:53
date last changed
2024-03-12 01:12:11
@article{9fe9b771-7dbc-4c10-9630-be8850584dd8,
  abstract     = {{Four whole- lake inorganic C-13 addition experiments were conducted in lakes of differing trophic status. Inorganic C-13 addition enriched algal carbon in C-13 and changed the delta C-13- DOC by + 1.5 parts per thousand to + 9.5 parts per thousand, depending on the specific lake. This change in delta C-13- DOC represented a significant input of algal DOC that was not completely consumed by bacteria. We modeled the dynamics in delta C-13- DOC to estimate the fluxes of algal and terrestrial carbon to and from the DOC pool, and determine the composition of the standing stock. Two experiments in lightly stained, oligotrophic lakes indicated that algal production was the source of about 20% of the DOC pool. In the following year, the experiment was repeated in one of these lakes under conditions of nutrient enrichment, and in a third, more humic lake. Algal contributions to the DOC pool were 40% in the nutrient enriched lake and 5% in the more humic lake. Spectroscopic and elemental analyses corroborated the presence of increased algal DOC in the nutrient enriched lake. Natural abundance measurements of the delta C-13 of DOC in 32 lakes also revealed the dual contributions of both terrestrial and algal carbon to DOC. From these results, we suggest an approach for inferring the contribution of algal and terrestrial DOC using easily measurable parameters.}},
  author       = {{Bade, Darren L. and Carpenter, Stephen R. and Cole, Jonathan J. and Pace, Michael L. and Kritzberg, Emma and Van de Bogert, Matthew C. and Cory, Rose M. and McKnight, Diane M.}},
  issn         = {{1573-515X}},
  keywords     = {{carbon stable isotopes; allochthonous; autochthonous; carbon; dissolved organic}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{115--129}},
  publisher    = {{Springer}},
  series       = {{Biogeochemistry}},
  title        = {{Sources and fates of dissolved organic carbon in lakes as determined by whole-lake carbon isotope additions}},
  url          = {{http://dx.doi.org/10.1007/s10533-006-9013-y}},
  doi          = {{10.1007/s10533-006-9013-y}},
  volume       = {{84}},
  year         = {{2007}},
}