Circumpolar assessment of permafrost C quality and its vulnerability over time using long-term incubation data
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 g...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.637.5270 2023-05-15T17:55:39+02:00 Circumpolar assessment of permafrost C quality and its vulnerability over time using long-term incubation data Merritt R. Turetsky The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.637.5270 http://www.lter.uaf.edu/pdf/1811_Schadel_Schuur_2014.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.637.5270 http://www.lter.uaf.edu/pdf/1811_Schadel_Schuur_2014.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.lter.uaf.edu/pdf/1811_Schadel_Schuur_2014.pdf text ftciteseerx 2016-01-08T15:46:07Z 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 circumpo-lar 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 Text permafrost Unknown |
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English |
description |
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 circumpo-lar 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 |
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The Pennsylvania State University CiteSeerX Archives |
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Text |
author |
Merritt R. Turetsky |
spellingShingle |
Merritt R. Turetsky Circumpolar assessment of permafrost C quality and its vulnerability over time using long-term incubation data |
author_facet |
Merritt R. Turetsky |
author_sort |
Merritt R. Turetsky |
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 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.637.5270 http://www.lter.uaf.edu/pdf/1811_Schadel_Schuur_2014.pdf |
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permafrost |
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permafrost |
op_source |
http://www.lter.uaf.edu/pdf/1811_Schadel_Schuur_2014.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.637.5270 http://www.lter.uaf.edu/pdf/1811_Schadel_Schuur_2014.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766163606887464960 |