Impact of modified temperature and precipitation regime on soil microorganisms and carbon cycling in arable soils
Zusammenfassung der Projektergebnisse
The aim of this project was to link SOC turnover under conditions of increased temperature and modified precipitation to microbial abundance, diversity and activity in an agricultural ecosystem. We successfully established the Hohenheim Climate Change (HoCC) experiment, which simulates an elevated soil temperature by 2.5°C and reduced summer precipitation amount and frequency. The results of the first two years underline the importance of soil moisture as driving factor for ecosystem response to elevated temperature. In contrast, altered precipitation showed only minor effects during the first two years of the experiment. Preliminary results indicate a shift towards a fungal dominated microbial community and an altered functioning of soil microorganisms due to soil warming. In the future, we aim to investigate microbial adaptation at the taxonomical and physiological level in more detail and to link this to different processes involved in C cycling. Beside the effect of climate change on C cycling in soil, we found an increased N2O emission in 2009, which underlines the importance of soils as source for other greenhouse gases than CO2 and its relevance as potential feedback mechanism to climate change. The projected increase in temperature under climate change may also affect crop quality, which have to date received little attention under realistic field conditions. We conclude from our study that the moisture regime of soils under elevation of temperature will largely determine whether different soils will serve either as carbon sources or carbon sinks and that other functions of agricultural ecosystems like N2O emission or food production have to be considered. Linking these effects will help to get a comprehensive view on the response of agricultural ecosystems to climate change.
Projektbezogene Publikationen (Auswahl)
- (2009). Einfluss des Klimawandels auf die CO2 und N2O Emissionen eines Agrarökosystems. Annual meeting of the German Soil Science Society in Bonn, Germany
Marhan S., Back F., Kandeler E., Poll C.
- (2010). Einfluss des Klimawandels auf die CO2 Emission und die mikrobielle Aktivität eines Agrarökosystems. Meeting of Commission III (Soil Biology) of the German Soil Science Society in Chiemsee, Germany
Poll C., Marhan S., Kandeler E.
- (2010). Manipulation of temperature and precipitation alter CO2 and N2O fluxes from an arable soil. Annual meeting of the European Geosciences Union in Vienna, Austria
Poll C., Marhan S., Kandeler E.
- (2010). Manipulation of temperature and precipitation alter CO2 fluxes from an arable soil. “Organic matter stabilization and ecosystem functions” in Presqu’ile de Giens, France
Poll C., Marhan S., Kandeler E.
- (2011). Crop yield and yield quality of barley as affected by temperature increase and change in precipitation pattern. Botanikertagung “Diversity makes the difference” in Berlin, Germany
Högy P., Poll C., Marhan S., Kandeler E., Fangmeier A.
- (2011). Einfluss des Klimawandels auf die Biomasse und Aktivität von Bodenmikroorganismen in einem Agrarökosystem. Annual meeting of the German Soil Science Society in Berlin, Germany
Poll C., Marhan S., Kandeler E.
- (2011). Grain quality characteristics of barley as affected by temperature increase and change in precipitation pattern. Proceedings of the EuroCereal “Science and technology meeting real world challenges” in Chipping Campden, United Kingdom
Högy P., Poll C., Marhan S., Kandeler E., Fangmeier A.
- (2011). Response of Soil Microbial Activity to Elevated Temperature and Altered Precipitation. “Enzymes in the Environment: Activity, Ecology & Applications” in Bad Nauheim, Germany
Poll C., Kandeler E.
- (2011). The influence of climate change on N-cycling microorganisms in soil. “Ecology of Soil Microorganisms- Microbes as Important Drivers of Soil Processes” in Prague, Czech Republic
Marhan S., Niehörster J., Niklaus P.A., Philippot L., Schloter M., Kandeler E., Poll C.
