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  Circumpolar assessment of permafrost C quality and its vulnerability over time using long-term incubation data

Schaedel, C., Schuur, E. A. G., Bracho, R., Elberling, B., Knoblauch, C., Lee, H., et al. (2014). Circumpolar assessment of permafrost C quality and its vulnerability over time using long-term incubation data. GLOBAL CHANGE BIOLOGY, 20(2), 641-652. doi:10.1111/gcb.12417.

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Schaedel, Christina1, Autor
Schuur, Edward A. G.1, Autor
Bracho, Rosvel1, Autor
Elberling, Bo1, Autor
Knoblauch, Christian2, Autor           
Lee, Hanna1, Autor
Luo, Yiqi1, Autor
Shaver, Gaius R.1, Autor
Turetsky, Merritt R.1, Autor
Affiliations:
1external, ou_persistent22              
2B 1 - Arctic and Permafrost, Research Area B: Climate Manifestations and Impacts, The CliSAP Cluster of Excellence, External Organizations, ou_1863481              

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Schlagwörter: SOIL ORGANIC-MATTER; TEMPERATURE SENSITIVITY; CARBON RELEASE; CLIMATE-CHANGE; TUNDRA SOILS; DECOMPOSITION; FOREST; CO2; TURNOVER; PEATAlaska; boreal forest; C decomposition; climate change; Siberia; soil organic carbon; tundra;
 Zusammenfassung: High-latitude ecosystems store approximately 1700Pg 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 (>1year) 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 degrees 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 degrees C of fast cycling C typically was below 1year, between 5 and 15years for slow turning over C, and more than 500years for passive C. We project that between 20 and 90% of the organic C could potentially be mineralized to CO2 within 50 incubation years at a constant temperature of 5 degrees 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.

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Sprache(n): eng - English
 Datum: 2014-02
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: ISI: 000329349700028
DOI: 10.1111/gcb.12417
 Art des Abschluß: -

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Titel: GLOBAL CHANGE BIOLOGY
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 20 (2) Artikelnummer: - Start- / Endseite: 641 - 652 Identifikator: ISSN: 1354-1013