Swiss Federal Institute for Forest, Snow and Landscape Research WSL COST Action FP0803 Technical Report Belowground Carbon Turnover in European Forests: Fine Roots, Mycorrhizal Mycelia, Soil Organic Matter and Soil Models A Technical Report for National C Reporters, LULUCF Experts and Ecosystem Modellers Authors: Ivano Brunner, Isabella Børja, Lise Dalsgaard, Gaby Deckmyn, Alf Ekblad, Douglas L. Godbold, Irene Guerra Avalos, Martin Lukac, Karsten Kalbitz, Kaie Kriiska, Ivika Ostonen, Andrea Schnepf, Primož Simončič, Elena Vanguelova