Multi-molecular tracers of terrestrial carbon transfer across the pan-Arctic: comparison of hydrolyzable components with plant wax lipids and lignin phenols
Hydrolyzable organic carbon (OC) comprises a significant component of sedimentary particulate matter transferred from land into oceans via rivers. Its abundance and nature are however not well studied in Arctic river systems, and yet may represent an important pool of carbon whose fate remains uncle...
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ftdoajarticles:oai:doaj.org/article:acff5fc9f0b8428b94e5cd8333372cd0 2023-05-15T14:50:12+02:00 Multi-molecular tracers of terrestrial carbon transfer across the pan-Arctic: comparison of hydrolyzable components with plant wax lipids and lignin phenols X. Feng Ö. Gustafsson R. M. Holmes J. E. Vonk B. E. van Dongen I. P. Semiletov O. V. Dudarev M. B. Yunker R. W. Macdonald D. B. Montluçon T. I. Eglinton 2015-08-01T00:00:00Z https://doi.org/10.5194/bg-12-4841-2015 https://doaj.org/article/acff5fc9f0b8428b94e5cd8333372cd0 EN eng Copernicus Publications http://www.biogeosciences.net/12/4841/2015/bg-12-4841-2015.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-12-4841-2015 https://doaj.org/article/acff5fc9f0b8428b94e5cd8333372cd0 Biogeosciences, Vol 12, Iss 15, Pp 4841-4860 (2015) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2015 ftdoajarticles https://doi.org/10.5194/bg-12-4841-2015 2022-12-31T00:03:11Z Hydrolyzable organic carbon (OC) comprises a significant component of sedimentary particulate matter transferred from land into oceans via rivers. Its abundance and nature are however not well studied in Arctic river systems, and yet may represent an important pool of carbon whose fate remains unclear in the context of mobilization and related processes associated with a changing climate. Here, we examine the molecular composition and source of hydrolyzable compounds isolated from sedimentary particles derived from nine rivers across the pan-Arctic. Bound fatty acids (b-FAs), hydroxy FAs, n-alkane-α,ω-dioic acids (DAs) and phenols were the major components released upon hydrolysis of these sediments. Among them, b-FAs received considerable inputs from bacterial and/or algal sources, whereas ω-hydroxy FAs, mid-chain substituted acids, DAs, and hydrolyzable phenols were mainly derived from cutin and suberin of higher plants. We further compared the distribution and fate of suberin- and cutin-derived compounds with those of other terrestrial biomarkers (plant wax lipids and lignin phenols) from the same Arctic river sedimentary particles and conducted a benchmark assessment of several biomarker-based indicators of OC source and extent of degradation. While suberin-specific biomarkers were positively correlated with plant-derived high-molecular-weight (HMW) FAs, lignin phenols were correlated with cutin-derived compounds. These correlations suggest that, similar to leaf-derived cutin, lignin was mainly derived from litter and surface soil horizons, whereas suberin and HMW FAs incorporated significant inputs from belowground sources (roots and deeper soil). This conclusion is supported by the negative correlation between lignin phenols and the ratio of suberin-to-cutin biomarkers. Furthermore, the molecular composition of investigated biomarkers differed between Eurasian and North American Arctic rivers: while lignin dominated in the terrestrial OC of Eurasian river sediments, hydrolyzable OC represented a much ... Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Biogeosciences 12 15 4841 4860 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
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 X. Feng Ö. Gustafsson R. M. Holmes J. E. Vonk B. E. van Dongen I. P. Semiletov O. V. Dudarev M. B. Yunker R. W. Macdonald D. B. Montluçon T. I. Eglinton Multi-molecular tracers of terrestrial carbon transfer across the pan-Arctic: comparison of hydrolyzable components with plant wax lipids and lignin phenols |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Hydrolyzable organic carbon (OC) comprises a significant component of sedimentary particulate matter transferred from land into oceans via rivers. Its abundance and nature are however not well studied in Arctic river systems, and yet may represent an important pool of carbon whose fate remains unclear in the context of mobilization and related processes associated with a changing climate. Here, we examine the molecular composition and source of hydrolyzable compounds isolated from sedimentary particles derived from nine rivers across the pan-Arctic. Bound fatty acids (b-FAs), hydroxy FAs, n-alkane-α,ω-dioic acids (DAs) and phenols were the major components released upon hydrolysis of these sediments. Among them, b-FAs received considerable inputs from bacterial and/or algal sources, whereas ω-hydroxy FAs, mid-chain substituted acids, DAs, and hydrolyzable phenols were mainly derived from cutin and suberin of higher plants. We further compared the distribution and fate of suberin- and cutin-derived compounds with those of other terrestrial biomarkers (plant wax lipids and lignin phenols) from the same Arctic river sedimentary particles and conducted a benchmark assessment of several biomarker-based indicators of OC source and extent of degradation. While suberin-specific biomarkers were positively correlated with plant-derived high-molecular-weight (HMW) FAs, lignin phenols were correlated with cutin-derived compounds. These correlations suggest that, similar to leaf-derived cutin, lignin was mainly derived from litter and surface soil horizons, whereas suberin and HMW FAs incorporated significant inputs from belowground sources (roots and deeper soil). This conclusion is supported by the negative correlation between lignin phenols and the ratio of suberin-to-cutin biomarkers. Furthermore, the molecular composition of investigated biomarkers differed between Eurasian and North American Arctic rivers: while lignin dominated in the terrestrial OC of Eurasian river sediments, hydrolyzable OC represented a much ... |
format |
Article in Journal/Newspaper |
author |
X. Feng Ö. Gustafsson R. M. Holmes J. E. Vonk B. E. van Dongen I. P. Semiletov O. V. Dudarev M. B. Yunker R. W. Macdonald D. B. Montluçon T. I. Eglinton |
author_facet |
X. Feng Ö. Gustafsson R. M. Holmes J. E. Vonk B. E. van Dongen I. P. Semiletov O. V. Dudarev M. B. Yunker R. W. Macdonald D. B. Montluçon T. I. Eglinton |
author_sort |
X. Feng |
title |
Multi-molecular tracers of terrestrial carbon transfer across the pan-Arctic: comparison of hydrolyzable components with plant wax lipids and lignin phenols |
title_short |
Multi-molecular tracers of terrestrial carbon transfer across the pan-Arctic: comparison of hydrolyzable components with plant wax lipids and lignin phenols |
title_full |
Multi-molecular tracers of terrestrial carbon transfer across the pan-Arctic: comparison of hydrolyzable components with plant wax lipids and lignin phenols |
title_fullStr |
Multi-molecular tracers of terrestrial carbon transfer across the pan-Arctic: comparison of hydrolyzable components with plant wax lipids and lignin phenols |
title_full_unstemmed |
Multi-molecular tracers of terrestrial carbon transfer across the pan-Arctic: comparison of hydrolyzable components with plant wax lipids and lignin phenols |
title_sort |
multi-molecular tracers of terrestrial carbon transfer across the pan-arctic: comparison of hydrolyzable components with plant wax lipids and lignin phenols |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/bg-12-4841-2015 https://doaj.org/article/acff5fc9f0b8428b94e5cd8333372cd0 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Biogeosciences, Vol 12, Iss 15, Pp 4841-4860 (2015) |
op_relation |
http://www.biogeosciences.net/12/4841/2015/bg-12-4841-2015.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-12-4841-2015 https://doaj.org/article/acff5fc9f0b8428b94e5cd8333372cd0 |
op_doi |
https://doi.org/10.5194/bg-12-4841-2015 |
container_title |
Biogeosciences |
container_volume |
12 |
container_issue |
15 |
container_start_page |
4841 |
op_container_end_page |
4860 |
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1766321242999095296 |