Circumpolar assessment of permafrost C quality and its vulnerability over time using long‐term incubation data
Abstract High‐latitude ecosystems store approximately 1700 Pg of soil carbon (C), which is twice as much C as is currently contained in the atmosphere. Permafrost thaw and subsequent microbial decomposition of permafrost organic matter could add large amounts of C to the atmosphere, thereby influenc...
Published in: | Global Change Biology |
---|---|
Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2013
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/gcb.12417 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fgcb.12417 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.12417 |
id |
crwiley:10.1111/gcb.12417 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/gcb.12417 2024-06-23T07:56:03+00:00 Circumpolar assessment of permafrost C quality and its vulnerability over time using long‐term incubation data Schädel, Christina Schuur, Edward A. G. Bracho, Rosvel Elberling, Bo Knoblauch, Christian Lee, Hanna Luo, Yiqi Shaver, Gaius R. Turetsky, Merritt R. 2013 http://dx.doi.org/10.1111/gcb.12417 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fgcb.12417 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.12417 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Global Change Biology volume 20, issue 2, page 641-652 ISSN 1354-1013 1365-2486 journal-article 2013 crwiley https://doi.org/10.1111/gcb.12417 2024-06-13T04:21:07Z Abstract High‐latitude ecosystems store approximately 1700 Pg of soil carbon (C), which is twice as much C as is currently contained in the atmosphere. Permafrost thaw and subsequent microbial decomposition of permafrost organic matter could add large amounts of C to the atmosphere, thereby influencing the global C cycle. The rates at which C is being released from the permafrost zone at different soil depths and across different physiographic regions are poorly understood but crucial in understanding future changes in permafrost C storage with climate change. We assessed the inherent decomposability of C from the permafrost zone by assembling a database of long‐term (>1 year) aerobic soil incubations from 121 individual samples from 23 high‐latitude ecosystems located across the northern circumpolar permafrost zone. Using a three‐pool (i.e., fast, slow and passive) decomposition model, we estimated pool sizes for C fractions with different turnover times and their inherent decomposition rates using a reference temperature of 5 °C. Fast cycling C accounted for less than 5% of all C in both organic and mineral soils whereas the pool size of slow cycling C increased with C : N. Turnover time at 5 °C of fast cycling C typically was below 1 year, between 5 and 15 years for slow turning over C, and more than 500 years for passive C. We project that between 20 and 90% of the organic C could potentially be mineralized to CO 2 within 50 incubation years at a constant temperature of 5 °C, with vulnerability to loss increasing in soils with higher C : N. These results demonstrate the variation in the vulnerability of C stored in permafrost soils based on inherent differences in organic matter decomposability, and point toward C : N as an index of decomposability that has the potential to be used to scale permafrost C loss across landscapes. Article in Journal/Newspaper permafrost Wiley Online Library Global Change Biology 20 2 641 652 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract High‐latitude ecosystems store approximately 1700 Pg of soil carbon (C), which is twice as much C as is currently contained in the atmosphere. Permafrost thaw and subsequent microbial decomposition of permafrost organic matter could add large amounts of C to the atmosphere, thereby influencing the global C cycle. The rates at which C is being released from the permafrost zone at different soil depths and across different physiographic regions are poorly understood but crucial in understanding future changes in permafrost C storage with climate change. We assessed the inherent decomposability of C from the permafrost zone by assembling a database of long‐term (>1 year) aerobic soil incubations from 121 individual samples from 23 high‐latitude ecosystems located across the northern circumpolar permafrost zone. Using a three‐pool (i.e., fast, slow and passive) decomposition model, we estimated pool sizes for C fractions with different turnover times and their inherent decomposition rates using a reference temperature of 5 °C. Fast cycling C accounted for less than 5% of all C in both organic and mineral soils whereas the pool size of slow cycling C increased with C : N. Turnover time at 5 °C of fast cycling C typically was below 1 year, between 5 and 15 years for slow turning over C, and more than 500 years for passive C. We project that between 20 and 90% of the organic C could potentially be mineralized to CO 2 within 50 incubation years at a constant temperature of 5 °C, with vulnerability to loss increasing in soils with higher C : N. These results demonstrate the variation in the vulnerability of C stored in permafrost soils based on inherent differences in organic matter decomposability, and point toward C : N as an index of decomposability that has the potential to be used to scale permafrost C loss across landscapes. |
format |
Article in Journal/Newspaper |
author |
Schädel, Christina Schuur, Edward A. G. Bracho, Rosvel Elberling, Bo Knoblauch, Christian Lee, Hanna Luo, Yiqi Shaver, Gaius R. Turetsky, Merritt R. |
spellingShingle |
Schädel, Christina Schuur, Edward A. G. Bracho, Rosvel Elberling, Bo Knoblauch, Christian Lee, Hanna Luo, Yiqi Shaver, Gaius R. Turetsky, Merritt R. Circumpolar assessment of permafrost C quality and its vulnerability over time using long‐term incubation data |
author_facet |
Schädel, Christina Schuur, Edward A. G. Bracho, Rosvel Elberling, Bo Knoblauch, Christian Lee, Hanna Luo, Yiqi Shaver, Gaius R. Turetsky, Merritt R. |
author_sort |
Schädel, Christina |
title |
Circumpolar assessment of permafrost C quality and its vulnerability over time using long‐term incubation data |
title_short |
Circumpolar assessment of permafrost C quality and its vulnerability over time using long‐term incubation data |
title_full |
Circumpolar assessment of permafrost C quality and its vulnerability over time using long‐term incubation data |
title_fullStr |
Circumpolar assessment of permafrost C quality and its vulnerability over time using long‐term incubation data |
title_full_unstemmed |
Circumpolar assessment of permafrost C quality and its vulnerability over time using long‐term incubation data |
title_sort |
circumpolar assessment of permafrost c quality and its vulnerability over time using long‐term incubation data |
publisher |
Wiley |
publishDate |
2013 |
url |
http://dx.doi.org/10.1111/gcb.12417 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fgcb.12417 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.12417 |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Global Change Biology volume 20, issue 2, page 641-652 ISSN 1354-1013 1365-2486 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/gcb.12417 |
container_title |
Global Change Biology |
container_volume |
20 |
container_issue |
2 |
container_start_page |
641 |
op_container_end_page |
652 |
_version_ |
1802648893693886464 |