Warming effects on soil C-cycling: Nine years of artificial soil warming in a temperate mountain forest

Andreas Schindlbacher1, Robert Jandl1, Wolfgang Wanek2, Jörg Schnecker2, Ivika Ostonen3, Kaarin Paarts3, Douglas Godbold4, Sumitra Dewan4, Inken Krüger5, Alena Hubach5, Werner Borken5
1 Federal Research and Training Centre for Forests, Natural Hazards and Landscape – BFW, Vienna, Austria
2 Vienna Ecology Centre, Faculty of Life Sciences, Department of Microbiology and Ecosystem Research, University of Vienna, Vienna, Austria
3 Institute of Ecology and Earth Sciences, University of Tartu, Estonia
4 Institute of Forest Ecology, University of Natural Resources and Life Sciences - BOKU, Vienna, Austria
5 Bayreuth Center for Ecology and Environmental Research - BAYCEER, Department of Soil Ecology, University of Bayreuth, Germany

O 4.5 in Below ground turnover of C and nutrients in forest soils

14.07.2014, 15:15-15:35, H17

Global warming will affect the carbon cycling of many forest ecosystems. Major biological processes such as the decomposition of soil organic matter are primarily driven by temperature. We artificially warmed the soil of a mature mixed stand by 4°C throughout the snow free seasons since 2004. Warming increased the soil CO2 efflux by 40-50%, but in contrast to many other warming studies, the warming effect did not decline over time. Warming effects on soil C pools, fine roots, and mycorrhiza were assessed in detail during 2012 and 2013, the 8th and 9th year of artificial soil warming, respectively. First results suggest that soil warming fuelled the labile C pool by greater transfer of assimilates to the rhizosphere. Final results of the extensive study will be presented at the conference.

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Letzte Änderung 01.04.2014