How will a drier climate change carbon sequestration in soils of the deciduous forests of Central Europe?
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How will a drier climate change carbon sequestration in soils of the deciduous forests of Central Europe? Istva´n Fekete . Imre Berki . Kate Lajtha . Susan Trumbore . Ornella Francioso . ´ ron Be´ni . Paola Gioacchini . Daniela Montecchio . Ga´bor Va´rbı´ro´ . A . . . ´ ´ ´ Marianna Makadi Ibolya Demeter Balazs Madarasz Katalin Juhos . Zsolt Kotroczo´
Received: 29 March 2020 / Accepted: 8 November 2020 Ó The Author(s) 2020, corrected publication 2020
Abstract Global warming is accompanied by increasing water stress across much of our planet. We studied soil biological processes and changes in soil organic carbon (SOC) storage in 30 Hungarian oak forest sites in the Carpathian Basin along a climatic gradient (mean annual temperature (MAT) 9.6–12.1 °C, mean annual precipitation (MAP) 545–725 mm) but on similar gently sloped hillsides where the parent materials are loess and weathered dust inputs dating from the end of the ice age. The purpose of this research was to understand how a drying climate, predicted for this region, might regulate long-term SOC sequestration. To examine
Responsible Editor: R. Kelman Wieder I. Fekete (&) Institute of Environmental Sciences, University of Nyı´regyha´za, Nyı´regyha´za, Hungary e-mail: [email protected] I. Fekete K. Juhos Z. Kotroczo´ (&) Department of Soil Science and Water Management, Szent Istva´n University, Budapest, Hungary e-mail: [email protected] I. Berki Institute of Environmental and Earth Sciences, University of Sopron Hungary, Sopron, Hungary
the effects of decreasing water availability, we compared soil parameters and processes in three categories of forest that represented the moisture extremes along our gradient and that were defined using a broken-stick regression model. Soil biological activity was significantly lower in the driest (‘‘dry’’) forests, which had more than double the SOC concentration in the upper 30 cm layer (3.28 g C/100 g soil ± 0.11 SE) compared to soils of the wettest (‘‘humid’’) forests (1.32 g C/100 g soil ± 0.09 SE), despite the fact that annual surface litter production in humid forests was * 37% higher than in dry forests. A two-pool SOM model constrained to fit radiocarbon data indicates that turnover times for fast and slow pools are about half as long in the humid soil compared to the dry soil, and humid soils transfer C twice as efficiently from fast to S. Trumbore Max Planck Institute for Biogeochemistry, Jena, Germany O. Francioso P. Gioacchini D. Montecchio Department of Agricultural and Food Sciences, University of Bologna, Bologna, Italy G. Va´rbı´ro´ Department of Tisza River Research, Danube Research Institute, Centre for Ecology of HAS, Debrecen, Hungary ´ . Be´ni A Institute of Agricultural Chemistry and Soil Science, University of Debrecen, Debrecen, Hungary
K. Lajtha Department of Crop and Soil Sciences, Oregon State University, Corvallis, OR, USA
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Biogeochemistry
slow pools. Enzyme activity and fungal biomass data also imply shorter turnover time
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