Soil Biology and Biochemistry, Sept, 2012, Vol.52, p.43(6)
To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.soilbio.2012.04.001 Byline: Bertrand Guenet (a), Sabrina Juarez (b), Gerard Bardoux (c), Luc Abbadie (a), Claire Chenu (b) Abstract: A significant fraction of soil organic carbon, named stable organic carbon (C) pool, has residence times longer than centuries and its vulnerability to land use or climatic changes is virtually unknown. Long-term bare fallows offer a unique opportunity to isolate the stable organic pool of soils and study its properties. We investigated the vulnerability of the stable organic C pool to fresh organic matter inputs by comparing the mineralization in a long-term bare fallow soil with that of an adjacent arable soil, containing stable C as well as more labile C. For this, we amended or not the soil samples with two different.sup.13C-labelled fresh organic matter (straw or cellulose). In all cases we found a positive priming effect (i.e. an increased mineralization of soil organic carbon) when fresh organic matter was added. By comparing the results obtained on both soils, we estimated that half of the "primed" C in the arable soil due to straw addition as fresh organic matter, originated from the stable C pool. Our results suggest that under such conditions, which frequently occur, the stable pool of soil organic matter may largely contribute to soil extra-CO.sub.2 emissions due to priming effect. Consequently, the C storage potential of this pool may be modified by changes in land use and/or biomass production that might change the priming of the mineralization of the stable pool of soil organic carbon. Author Affiliation: (a) UPMC, UMR 7618 Bioemco, 46 rue d'Ulm, F-75230 Paris, France (b) AgroParisTech, UMR 7618 Bioemco, Batiment EGER, 78850 Thiverval Grignon, France (c) CNRS, UMR 7618 Bioemco, Batiment EGER, 78850 Thiverval Grignon, France Article History: Received 31 August 2011; Revised 1 April 2012; Accepted 2 April 2012
Soil Carbon ; Cellulose
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