Evidence that stable C is as vulnerable to priming effect as is more labile C in soil

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• 作者：Bertrand Guenet^a ; ¹ ; Sabrina Juarez^b ; Gé ; rard Bardoux^c ; Luc Abbadie^a ; Claire Chenu^b ; ^{chenu@grignon.inra.fr}
• 关键词：Priming effect ; Stable carbon ; Long-term bare fallow ; Mineralization ; 13C-fresh organic matter
• 刊名：Soil Biology & Biochemistry
• 出版年：2012
• 期刊代码：96_00380717
• 类别：abs
• 出版时间：September, 2012
• 卷：52
• 期：Complete
• 页码：43-48
• 文件大小：399 K

摘要

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 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 鈥減rimed鈥?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-CO₂ 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.