Biodegradability of dissolved organic carbon in permafrost soils and aquatic systems: a meta-analysis
As Arctic regions warm and frozen soils thaw, the large organic carbon pool stored in permafrost becomes increasingly vulnerable to decomposition or transport. The transfer of newly mobilized carbon to the atmosphere and its potential influence upon climate change will largely depend on the degradab...
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ftdoajarticles:oai:doaj.org/article:6bbf9616ea8d4ab2abe4e0d48a4be416 2023-05-15T14:53:04+02:00 Biodegradability of dissolved organic carbon in permafrost soils and aquatic systems: a meta-analysis J. E. Vonk S. E. Tank P. J. Mann R. G. M. Spencer C. C. Treat R. G. Striegl B. W. Abbott K. P. Wickland 2015-12-01T00:00:00Z https://doi.org/10.5194/bg-12-6915-2015 https://doaj.org/article/6bbf9616ea8d4ab2abe4e0d48a4be416 EN eng Copernicus Publications http://www.biogeosciences.net/12/6915/2015/bg-12-6915-2015.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-12-6915-2015 https://doaj.org/article/6bbf9616ea8d4ab2abe4e0d48a4be416 Biogeosciences, Vol 12, Iss 23, Pp 6915-6930 (2015) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2015 ftdoajarticles https://doi.org/10.5194/bg-12-6915-2015 2022-12-31T02:46:32Z As Arctic regions warm and frozen soils thaw, the large organic carbon pool stored in permafrost becomes increasingly vulnerable to decomposition or transport. The transfer of newly mobilized carbon to the atmosphere and its potential influence upon climate change will largely depend on the degradability of carbon delivered to aquatic ecosystems. Dissolved organic carbon (DOC) is a key regulator of aquatic metabolism, yet knowledge of the mechanistic controls on DOC biodegradability is currently poor due to a scarcity of long-term data sets, limited spatial coverage of available data, and methodological diversity. Here, we performed parallel biodegradable DOC (BDOC) experiments at six Arctic sites (16 experiments) using a standardized incubation protocol to examine the effect of methodological differences commonly used in the literature. We also synthesized results from 14 aquatic and soil leachate BDOC studies from across the circum-arctic permafrost region to examine pan-arctic trends in BDOC. An increasing extent of permafrost across the landscape resulted in higher DOC losses in both soil and aquatic systems. We hypothesize that the unique composition of (yedoma) permafrost-derived DOC combined with limited prior microbial processing due to low soil temperature and relatively short flow path lengths and transport times, contributed to a higher overall terrestrial and freshwater DOC loss. Additionally, we found that the fraction of BDOC decreased moving down the fluvial network in continuous permafrost regions, i.e. from streams to large rivers, suggesting that highly biodegradable DOC is lost in headwater streams. We also observed a seasonal (January–December) decrease in BDOC in large streams and rivers, but saw no apparent change in smaller streams or soil leachates. We attribute this seasonal change to a combination of factors including shifts in carbon source, changing DOC residence time related to increasing thaw-depth, increasing water temperatures later in the summer, as well as decreasing hydrologic ... Article in Journal/Newspaper Arctic Climate change permafrost Directory of Open Access Journals: DOAJ Articles Arctic Biogeosciences 12 23 6915 6930 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 J. E. Vonk S. E. Tank P. J. Mann R. G. M. Spencer C. C. Treat R. G. Striegl B. W. Abbott K. P. Wickland Biodegradability of dissolved organic carbon in permafrost soils and aquatic systems: a meta-analysis |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
As Arctic regions warm and frozen soils thaw, the large organic carbon pool stored in permafrost becomes increasingly vulnerable to decomposition or transport. The transfer of newly mobilized carbon to the atmosphere and its potential influence upon climate change will largely depend on the degradability of carbon delivered to aquatic ecosystems. Dissolved organic carbon (DOC) is a key regulator of aquatic metabolism, yet knowledge of the mechanistic controls on DOC biodegradability is currently poor due to a scarcity of long-term data sets, limited spatial coverage of available data, and methodological diversity. Here, we performed parallel biodegradable DOC (BDOC) experiments at six Arctic sites (16 experiments) using a standardized incubation protocol to examine the effect of methodological differences commonly used in the literature. We also synthesized results from 14 aquatic and soil leachate BDOC studies from across the circum-arctic permafrost region to examine pan-arctic trends in BDOC. An increasing extent of permafrost across the landscape resulted in higher DOC losses in both soil and aquatic systems. We hypothesize that the unique composition of (yedoma) permafrost-derived DOC combined with limited prior microbial processing due to low soil temperature and relatively short flow path lengths and transport times, contributed to a higher overall terrestrial and freshwater DOC loss. Additionally, we found that the fraction of BDOC decreased moving down the fluvial network in continuous permafrost regions, i.e. from streams to large rivers, suggesting that highly biodegradable DOC is lost in headwater streams. We also observed a seasonal (January–December) decrease in BDOC in large streams and rivers, but saw no apparent change in smaller streams or soil leachates. We attribute this seasonal change to a combination of factors including shifts in carbon source, changing DOC residence time related to increasing thaw-depth, increasing water temperatures later in the summer, as well as decreasing hydrologic ... |
format |
Article in Journal/Newspaper |
author |
J. E. Vonk S. E. Tank P. J. Mann R. G. M. Spencer C. C. Treat R. G. Striegl B. W. Abbott K. P. Wickland |
author_facet |
J. E. Vonk S. E. Tank P. J. Mann R. G. M. Spencer C. C. Treat R. G. Striegl B. W. Abbott K. P. Wickland |
author_sort |
J. E. Vonk |
title |
Biodegradability of dissolved organic carbon in permafrost soils and aquatic systems: a meta-analysis |
title_short |
Biodegradability of dissolved organic carbon in permafrost soils and aquatic systems: a meta-analysis |
title_full |
Biodegradability of dissolved organic carbon in permafrost soils and aquatic systems: a meta-analysis |
title_fullStr |
Biodegradability of dissolved organic carbon in permafrost soils and aquatic systems: a meta-analysis |
title_full_unstemmed |
Biodegradability of dissolved organic carbon in permafrost soils and aquatic systems: a meta-analysis |
title_sort |
biodegradability of dissolved organic carbon in permafrost soils and aquatic systems: a meta-analysis |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/bg-12-6915-2015 https://doaj.org/article/6bbf9616ea8d4ab2abe4e0d48a4be416 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change permafrost |
genre_facet |
Arctic Climate change permafrost |
op_source |
Biogeosciences, Vol 12, Iss 23, Pp 6915-6930 (2015) |
op_relation |
http://www.biogeosciences.net/12/6915/2015/bg-12-6915-2015.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-12-6915-2015 https://doaj.org/article/6bbf9616ea8d4ab2abe4e0d48a4be416 |
op_doi |
https://doi.org/10.5194/bg-12-6915-2015 |
container_title |
Biogeosciences |
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12 |
container_issue |
23 |
container_start_page |
6915 |
op_container_end_page |
6930 |
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1766324491359617024 |