Evidence that stable C is as vulnerable to priming effect as is more labile C in soil |
| |
| Institution: | 1. UPMC, UMR 7618 Bioemco, 46 rue d''Ulm, F-75230 Paris, France;2. AgroParisTech, UMR 7618 Bioemco, Bâtiment EGER, 78850 Thiverval Grignon, France;3. CNRS, UMR 7618 Bioemco, Bâtiment EGER, 78850 Thiverval Grignon, France;1. Bioforsk – Norwegian Institute for Agricultural and Environmental Research, Organic Food and Farming Division, Gunnars Veg 6, N-6630 Tingvoll, Norway;2. Norwegian University of Life Sciences, Department of Environmental Sciences, Fougnerbakken 3, N-1432 Ås, Norway;1. Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan, 410125, China;2. Changsha Research Station for Agricultural and Environmental Monitoring, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan, 410125, China;3. Institute of Soil and Water Resources and Environmental Science, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou, 310058, China;4. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100081, China;5. Institute of Soil Science, Leibniz Universität Hannover, Hannover, 30419, Germany;6. VN Sukachev Institute of Forest, SB-RAS, Krasnoyarsk, 660036, Russian Federation;1. Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK;2. School of Geosciences, University of Edinburgh, Drummond Street, Edinburgh EH8 9XP, UK;3. Smithsonian Tropical Research Institute, Apartado 0843-03092, Balboa, Ancón, Panama;4. Centre of Ecology and Hydrology, Lancaster Environment Centre, Lancaster LA1 4AP, UK;1. Institute of Biological and Environmental Sciences, University of Aberdeen, Cruickshank, Building, St Machar Drive, AB24 3UU, Aberdeen, Scotland, UK;2. Teagasc; Environment, Soils and Land Use Research Department, Johnstown Castle, Wexford, Ireland;3. James Hutton Institute, Craigiebuckler, AB15 8QH, Aberdeenshire, Scotland, UK;1. Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, AZ, 86011, USA;2. Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ, 86011, USA;1. CSIRO A&F, GPO Box 1666, Canberra ACT 2601, Australia;2. College of Forest Science, Beijing Forestry University, Beijing 100083, China |
| |
| 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 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-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. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
