Institute for Soil Science University of Hohenheim Soil Biology Prof. Dr. Ellen Kandeler Community Structure and Activity of Nitrate-Reducing Microorganisms in Soils under Global Climate Change Dissertation Submitted in fulfilment of the requirements for the degree “Doktor der Agrarwissenschaften” (Dr. sc. agr.) to the Faculty of Agricultural Sciences presented by Kathrin Deiglmayr München 2006