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Drying/rewetting cycles mobilize old C from deep soils from a California annual grassland

Schimel, Joshua P. and Wetterstedt, J. Å. Martin and Holden, Patricia A. and Trumbore, Susan E. (2010). Drying/rewetting cycles mobilize old C from deep soils from a California annual grassland.
[Preprint] (Unpublished)

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Abstract

We measured the natural abundance of 14C in CO2 respired from surface and deep soils released through multiple dry/rewetting cycles in laboratory incubations. While the C respired from surface soils was 'young', that respired from deep soils came from C pools with an average turnover time of 650-850 years. This reinforces previous research suggesting that a substantial amount of deep soil C is chemically labile but physically inaccessible to microorganisms, but also suggests that substantial amounts of that C may not be so strongly bound to minerals as to be effectively inert, raising the question of why it hasn't already been metabolized.

Authors/Creators:Schimel, Joshua P. and Wetterstedt, J. Å. Martin and Holden, Patricia A. and Trumbore, Susan E.
Title:Drying/rewetting cycles mobilize old C from deep soils from a California annual grassland
Year of publishing :4 March 2010
Publisher:Sveriges lantbruksuniversitet
Language:English
Publication Type:Preprint
Full Text Status:Public
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Soil science
Keywords:soil carbon, deep soil, physical protection, radiocarbon, priming
URN:NBN:urn:nbn:se:slu:epsilon-3-22
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-3-22
ID Code:4559
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Deposited By: Martin Wetterstedt
Deposited On:15 Mar 2010 00:00
Metadata Last Modified:02 Dec 2014 10:31

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