publication . Article . 2011

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

Schimel, Joshua P.; Wetterstedt, J. Å. Martin; Holden, Patricia A.; Trumbore, Susan E.;
Open Access English
  • Published: 01 May 2011
  • Publisher: eScholarship, University of California
Abstract
We measured the14C and13C signatures of CO2respired from surface and deep soils released through multiple dry/rewetting cycles in laboratory incubations. The C respired from surface soils included components fixed before and after the 1960s. However, that respired from deep soils was derived from organic matter with a mean turnover time estimated in the range 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 qu...
Subjects
free text keywords: Soil science
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publication . Article . 2011

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

Schimel, Joshua P.; Wetterstedt, J. Å. Martin; Holden, Patricia A.; Trumbore, Susan E.;