Wetterstedt, Martin
- Institutionen för ekologi, Sveriges lantbruksuniversitet
Sammanfattning
We measured the (14)C and (13)C signatures of CO(2) respired 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 question of why it hasn't already been metabolized. It also demonstrates the contribution of C fixed before the 1960s to CO(2) metabolized in the surface soils at this site. (C) 2011 Elsevier Ltd. All rights reserved.
Nyckelord
soil carbon; deep soil; physical protection; radiocarbon; priming
Publicerad i
Soil Biology and Biochemistry
2011, volym: 43, nummer: 5, sidor: 1101-1103
Utgivare: PERGAMON-ELSEVIER SCIENCE LTD
SLU författare
UKÄ forskningsämne
Miljö- och naturvårdsvetenskap
Publikationens identifierare
- DOI: https://doi.org/10.1016/j.soilbio.2011.01.008
Permanent länk till denna sida (URI)
https://res.slu.se/id/publ/59207