Variable respiration rates of incubated permafrost soil extracts from the Kolyma River lowlands, north-east Siberia
Thawing permafrost supplies dissolved organic carbon (DOC) to aquatic systems; however, the magnitude, variability and fate of this DOC is not well constrained. Our objective was to examine DOC respiration from seasonally thawed and near-surface (<1.5 m) permafrost soils collected from five locat...
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Norwegian Polar Institute
2017
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ftdoajarticles:oai:doaj.org/article:4f8d2c1ad4b047b99bd9f48b1ae5f920 2023-05-15T15:11:36+02:00 Variable respiration rates of incubated permafrost soil extracts from the Kolyma River lowlands, north-east Siberia Joanne K. Heslop Sudeep Chandra William V. Sobzcak Sergey P. Davydov Anna I. Davydova Valentin V. Spektor Katey M. Walter Anthony 2017-01-01T00:00:00Z https://doi.org/10.1080/17518369.2017.1305157 https://doaj.org/article/4f8d2c1ad4b047b99bd9f48b1ae5f920 EN eng Norwegian Polar Institute http://dx.doi.org/10.1080/17518369.2017.1305157 https://doaj.org/toc/1751-8369 1751-8369 doi:10.1080/17518369.2017.1305157 https://doaj.org/article/4f8d2c1ad4b047b99bd9f48b1ae5f920 Polar Research, Vol 36, Iss 1 (2017) Arctic carbon export and processing yedoma climate change greenhouse gas production Environmental sciences GE1-350 Oceanography GC1-1581 article 2017 ftdoajarticles https://doi.org/10.1080/17518369.2017.1305157 2022-12-31T11:49:35Z Thawing permafrost supplies dissolved organic carbon (DOC) to aquatic systems; however, the magnitude, variability and fate of this DOC is not well constrained. Our objective was to examine DOC respiration from seasonally thawed and near-surface (<1.5 m) permafrost soils collected from five locations in the Kolyma River Basin, north-east Russia. We measured soil organic carbon (OC) content, water-soluble macronutrients (DOC, NH4, PO4) and the heterotrophic respiration potentials of soil extract DOC in five-day laboratory incubations. DOC concentrations ranged from 2.8 to 27.9 mg L−1 (n = 14). Carbon respiration was 0.03–0.47 mg C (n = 16) and 8.7–31.4%, total DOC (n = 14). While DOC concentration was a function of soil OC concentration, we did not find a relationship between C respiration and soil OC or DOC concentrations. Respiration was highest in the top active layer, but varied widely among sites, and lowest at the bottom of the active layer. Respiration from yedoma varied across sites (0.04–0.47 mg C respired, 8.7–31.4% total DOC). Despite the small sample size, our study indicates near-surface soils and permafrost are spatially variable in terms of both soil OC content and C respiration rates, and also that OC contents do not predict C respiration rates. While a larger sample size would be useful to confirm these results at broader geographic scales, these initial results suggest that soil OC heterogeneity should be considered in efforts to determine the fate of soil OC released from permafrost-dominated terrestrial ecosystems to aquatic ecosystems following permafrost thaw. Article in Journal/Newspaper Arctic Climate change kolyma river permafrost Polar Research Siberia Directory of Open Access Journals: DOAJ Articles Arctic Kolyma ENVELOPE(161.000,161.000,69.500,69.500) Polar Research 36 1 1305157 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Arctic carbon export and processing yedoma climate change greenhouse gas production Environmental sciences GE1-350 Oceanography GC1-1581 |
spellingShingle |
Arctic carbon export and processing yedoma climate change greenhouse gas production Environmental sciences GE1-350 Oceanography GC1-1581 Joanne K. Heslop Sudeep Chandra William V. Sobzcak Sergey P. Davydov Anna I. Davydova Valentin V. Spektor Katey M. Walter Anthony Variable respiration rates of incubated permafrost soil extracts from the Kolyma River lowlands, north-east Siberia |
topic_facet |
Arctic carbon export and processing yedoma climate change greenhouse gas production Environmental sciences GE1-350 Oceanography GC1-1581 |
description |
Thawing permafrost supplies dissolved organic carbon (DOC) to aquatic systems; however, the magnitude, variability and fate of this DOC is not well constrained. Our objective was to examine DOC respiration from seasonally thawed and near-surface (<1.5 m) permafrost soils collected from five locations in the Kolyma River Basin, north-east Russia. We measured soil organic carbon (OC) content, water-soluble macronutrients (DOC, NH4, PO4) and the heterotrophic respiration potentials of soil extract DOC in five-day laboratory incubations. DOC concentrations ranged from 2.8 to 27.9 mg L−1 (n = 14). Carbon respiration was 0.03–0.47 mg C (n = 16) and 8.7–31.4%, total DOC (n = 14). While DOC concentration was a function of soil OC concentration, we did not find a relationship between C respiration and soil OC or DOC concentrations. Respiration was highest in the top active layer, but varied widely among sites, and lowest at the bottom of the active layer. Respiration from yedoma varied across sites (0.04–0.47 mg C respired, 8.7–31.4% total DOC). Despite the small sample size, our study indicates near-surface soils and permafrost are spatially variable in terms of both soil OC content and C respiration rates, and also that OC contents do not predict C respiration rates. While a larger sample size would be useful to confirm these results at broader geographic scales, these initial results suggest that soil OC heterogeneity should be considered in efforts to determine the fate of soil OC released from permafrost-dominated terrestrial ecosystems to aquatic ecosystems following permafrost thaw. |
format |
Article in Journal/Newspaper |
author |
Joanne K. Heslop Sudeep Chandra William V. Sobzcak Sergey P. Davydov Anna I. Davydova Valentin V. Spektor Katey M. Walter Anthony |
author_facet |
Joanne K. Heslop Sudeep Chandra William V. Sobzcak Sergey P. Davydov Anna I. Davydova Valentin V. Spektor Katey M. Walter Anthony |
author_sort |
Joanne K. Heslop |
title |
Variable respiration rates of incubated permafrost soil extracts from the Kolyma River lowlands, north-east Siberia |
title_short |
Variable respiration rates of incubated permafrost soil extracts from the Kolyma River lowlands, north-east Siberia |
title_full |
Variable respiration rates of incubated permafrost soil extracts from the Kolyma River lowlands, north-east Siberia |
title_fullStr |
Variable respiration rates of incubated permafrost soil extracts from the Kolyma River lowlands, north-east Siberia |
title_full_unstemmed |
Variable respiration rates of incubated permafrost soil extracts from the Kolyma River lowlands, north-east Siberia |
title_sort |
variable respiration rates of incubated permafrost soil extracts from the kolyma river lowlands, north-east siberia |
publisher |
Norwegian Polar Institute |
publishDate |
2017 |
url |
https://doi.org/10.1080/17518369.2017.1305157 https://doaj.org/article/4f8d2c1ad4b047b99bd9f48b1ae5f920 |
long_lat |
ENVELOPE(161.000,161.000,69.500,69.500) |
geographic |
Arctic Kolyma |
geographic_facet |
Arctic Kolyma |
genre |
Arctic Climate change kolyma river permafrost Polar Research Siberia |
genre_facet |
Arctic Climate change kolyma river permafrost Polar Research Siberia |
op_source |
Polar Research, Vol 36, Iss 1 (2017) |
op_relation |
http://dx.doi.org/10.1080/17518369.2017.1305157 https://doaj.org/toc/1751-8369 1751-8369 doi:10.1080/17518369.2017.1305157 https://doaj.org/article/4f8d2c1ad4b047b99bd9f48b1ae5f920 |
op_doi |
https://doi.org/10.1080/17518369.2017.1305157 |
container_title |
Polar Research |
container_volume |
36 |
container_issue |
1 |
container_start_page |
1305157 |
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1766342443351932928 |