Discrete functional pools of soil organic matter in a UK grassland soil are differentially affected by temperature and priming |
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| Affiliation: | 1. School of the Environment and Natural Resources, Bangor University, Gwynedd LL57 2UW, UK;2. School of Biological Sciences, Bangor University, Gwynedd LL57 2UW, UK;1. College of Environment and Planning, Henan University, Jinming Avenue, Kaifeng, 475004, China;2. UCA, INRA, VetAgro Sup, UMR Ecosystème Prairial, 5, Chemin de Beaulieu, 63000, Clermont-Ferrand, France;3. IEES-Paris (IRD, CNRS, UPMC, INRA, UPEC), 4 place Jussieu, 75252 Paris cedex 05, France;4. Université du Québec à Trois-Rivières, Trois-Rivières, QC, G9A 5H7, Canada;5. Department of Soil and Crop Sciences and Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, 80523, CO, USA;6. Department of Environmental Sciences & Engineering, Government College University Faisalabad, Allama Iqbal Road, 38000, Faisalabad, Pakistan;7. Agro-Technology Institute, RUDN University, Miklukho-Maklay st. 6, 117198, Moscow, Russia;8. United States Department of Agriculture, Agricultural Research Service, 2150 Centre Ave Building D, Suite 100, Fort Collins, CO 80526-8119, USA;9. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 210008 Nanjing, China;10. Institut für Biowissenschaften, TU Bergakademie Freiberg, 09599 Freiberg, Germany;11. INRA, UPR AgroImpact, Site de Laon, Pôle du Griffon, 02000 Barenton-Bugny, France;1. Department of Earth System Science, University of California, Irvine, CA 92697-3100, USA;2. Department of Biogeochemical Processes, Max Planck Institute for Biogeochemistry, 07745 Jena, Germany;3. Department of Earth, Atmospheric & Planetary Sciences and the Purdue Climate Change Research Center, Purdue University, West Lafayette, IN, USA;4. School of Agricultural, Forest and Environmental Sciences, Clemson University, Clemson, South Carolina, USA;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. College of Life and Environmental Sciences, University of Exeter, Rennes Drive, Exeter, Devon, EX4 4RJ, UK;2. Sustainable Agriculture Sciences, Rothamsted Research, North Wyke, Okehampton, Devon, EX20 2SB, UK;3. School of Environment, Natural Resources and Geography, Bangor University, Gwynedd, LL57 2UW, UK |
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| Abstract: | We show that both temperature and priming act differently on distinct C pools in a temperate grassland soil. We used SOM which was 14C-labelled in four different ways: by labelling soil with 14C-glucose, by adding leaf litter from plants pre-labelled with 14CO2, and by labelling in situ with 14CO2 applied to the ryegrass canopy either 6 or 18 months earlier. Samples of each type of 14C labelled soil were incubated at either 4, 10, 15, or 20 °C and the exponential loss of 14CO2 used to characterise treatment effects. 14C allocation to microbial fractions was greater, and so overall mineralization by microbes was greater, as temperature rose, but turnover of the microbial labile pool was temperature-insensitive, and the turnover of microbial structural material was reduced as temperature rose. The ability of the microbial population to degrade just one fraction of plant litter was increased greatly by temperature. A pool of SOM with a half-life of about 70 d was degraded faster at higher temperatures. Less tractable but abundant pools of SOM were not accessed more readily at higher temperatures by the microbial population. Priming with glucose or amino-acids only speeded the mineralization of recent SOM (probably from the living microbial biomass), and was not altered by temperature. These results have implications for the impacts of climate change on soil C cycling. |
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