Pyrogenic Carbon Lacks Long-Term Persistence in Temperate Arable Soils

Frontiers in Digital Humanities

van Oort, Folkert¹  Lutfalla, Suzanne¹  Macdonald, Andy J.²  Chenu, Claire³  Wiedemeier, Daniel B.⁴  tterer, Thomas⁴  Kä⁶  , Pierre⁶  Abiven, Samuel⁷  Christensen, Bent T.⁷  Houot, Sabine⁸  Barré⁸ 

[1] AgroParisTech, Institut National de la Recherche Agronomique, UMR 1402 ECOSYS, France;Department of Agroecology, Aarhus University, Denmark;Department of Ecology, Swedish University of Agricultural Sciences, Sweden;Department of Geography, University of Zurich, Switzerland;Department of Sustainable Soils and Grassland Systems, Rothamsted Research, United Kingdom;ENS-PSL Research University–Centre National de la Recherche Scientifique UMR8538, France;Laboratoire de Géologie de l'

关键词: Soil organic matter persistence;    Carbon Cycle;    pyrogenic carbon;    Climate change mitigation;    Arable soils;   

DOI  :  10.3389/feart.2017.00096

学科分类：社会科学、人文和艺术（综合）

来源: Frontiers

【 摘 要 】

Pyrogenic organic carbon (PyOC) derived from incomplete burning of biomass is considered the most persistent fraction of soil organic carbon (SOC), being expected to remain in soil for centuries. However, PyOC persistence has seldom been evaluated under field conditions. Based on a unique set of soils from five European long-term bare fallows, i.e. vegetation-free field experiments, we provide the first direct comparison between PyOC and SOC persistence in temperate arable soils. We found that soil PyOC contents decreased more rapidly than expected from current concepts, the mean residence time of native PyOC being just 1.6 times longer than that of SOC. At the oldest experimental site, 55% of the initial PyOC remained after 80 years of bare fallow. Our results suggest that while the potential for long-term C storage exists, the persistence of PyOC in soil may currently be overestimated.

【 授权许可】

CC BY