Accumulation of recalcitrant dissolved organic matter in aerobic aquatic systems
Abstract An oxygenated atmosphere changed life on Earth but it also provided a negative feedback to organic matter accumulation by increasing decomposition rates. Nonetheless, dissolved organic carbon (DOC) is a huge carbon pool (> 750 Pg) and it can accumulate to high concentrations (20–100 mg C...
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ftdoajarticles:oai:doaj.org/article:67941c6ab8d44c49a2362f3176e8182e 2023-05-15T16:29:06+02:00 Accumulation of recalcitrant dissolved organic matter in aerobic aquatic systems James B. Cotner N.J. Anderson Christopher Osburn 2022-10-01T00:00:00Z https://doi.org/10.1002/lol2.10265 https://doaj.org/article/67941c6ab8d44c49a2362f3176e8182e EN eng Wiley https://doi.org/10.1002/lol2.10265 https://doaj.org/toc/2378-2242 2378-2242 doi:10.1002/lol2.10265 https://doaj.org/article/67941c6ab8d44c49a2362f3176e8182e Limnology and Oceanography Letters, Vol 7, Iss 5, Pp 401-409 (2022) Oceanography GC1-1581 article 2022 ftdoajarticles https://doi.org/10.1002/lol2.10265 2022-12-30T20:01:15Z Abstract An oxygenated atmosphere changed life on Earth but it also provided a negative feedback to organic matter accumulation by increasing decomposition rates. Nonetheless, dissolved organic carbon (DOC) is a huge carbon pool (> 750 Pg) and it can accumulate to high concentrations (20–100 mg C L−1) in some freshwater aquatic systems, yet it is not clear why. Here, we examine DOC in several Greenland lakes with varying DOC concentrations and identify processes that could alter its composition to make it increasingly recalcitrant. Δ14C aging of DOC corresponded with increased DOC concentrations, slower degradation rates, changes in isotope ratios and optical properties, all suggesting that photochemical and microbial degradation processes contributed to recalcitrance. Young DOC degradation was stimulated by phosphorus, but older DOC was not, suggesting an important role for nutrients early in degradation. Photochemical processing coupled with decreased habitat diversity in hydrologically isolated systems may enable recalcitrant DOC to accumulate with important implications for Earth's carbon and oxygen cycles. Article in Journal/Newspaper Greenland Directory of Open Access Journals: DOAJ Articles Greenland Limnology and Oceanography Letters 7 5 401 409 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
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English |
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Oceanography GC1-1581 |
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Oceanography GC1-1581 James B. Cotner N.J. Anderson Christopher Osburn Accumulation of recalcitrant dissolved organic matter in aerobic aquatic systems |
topic_facet |
Oceanography GC1-1581 |
description |
Abstract An oxygenated atmosphere changed life on Earth but it also provided a negative feedback to organic matter accumulation by increasing decomposition rates. Nonetheless, dissolved organic carbon (DOC) is a huge carbon pool (> 750 Pg) and it can accumulate to high concentrations (20–100 mg C L−1) in some freshwater aquatic systems, yet it is not clear why. Here, we examine DOC in several Greenland lakes with varying DOC concentrations and identify processes that could alter its composition to make it increasingly recalcitrant. Δ14C aging of DOC corresponded with increased DOC concentrations, slower degradation rates, changes in isotope ratios and optical properties, all suggesting that photochemical and microbial degradation processes contributed to recalcitrance. Young DOC degradation was stimulated by phosphorus, but older DOC was not, suggesting an important role for nutrients early in degradation. Photochemical processing coupled with decreased habitat diversity in hydrologically isolated systems may enable recalcitrant DOC to accumulate with important implications for Earth's carbon and oxygen cycles. |
format |
Article in Journal/Newspaper |
author |
James B. Cotner N.J. Anderson Christopher Osburn |
author_facet |
James B. Cotner N.J. Anderson Christopher Osburn |
author_sort |
James B. Cotner |
title |
Accumulation of recalcitrant dissolved organic matter in aerobic aquatic systems |
title_short |
Accumulation of recalcitrant dissolved organic matter in aerobic aquatic systems |
title_full |
Accumulation of recalcitrant dissolved organic matter in aerobic aquatic systems |
title_fullStr |
Accumulation of recalcitrant dissolved organic matter in aerobic aquatic systems |
title_full_unstemmed |
Accumulation of recalcitrant dissolved organic matter in aerobic aquatic systems |
title_sort |
accumulation of recalcitrant dissolved organic matter in aerobic aquatic systems |
publisher |
Wiley |
publishDate |
2022 |
url |
https://doi.org/10.1002/lol2.10265 https://doaj.org/article/67941c6ab8d44c49a2362f3176e8182e |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Limnology and Oceanography Letters, Vol 7, Iss 5, Pp 401-409 (2022) |
op_relation |
https://doi.org/10.1002/lol2.10265 https://doaj.org/toc/2378-2242 2378-2242 doi:10.1002/lol2.10265 https://doaj.org/article/67941c6ab8d44c49a2362f3176e8182e |
op_doi |
https://doi.org/10.1002/lol2.10265 |
container_title |
Limnology and Oceanography Letters |
container_volume |
7 |
container_issue |
5 |
container_start_page |
401 |
op_container_end_page |
409 |
_version_ |
1766018784503529472 |