Anthropogenic impact on the carbon cycle of fen peatlands in NE-Germany

(1) Leibniz-Centre of Agricultural Landscape Research (ZALF) e.V., Eberswalderstr. 84, D-15374 Muncheberg, Germany, giebels@zalf.de, jaug@zalf.de, mertenchristian@gmx.de, emma.halle@mailbox.tu-dresden.de, madlen.beyer@gmx.net, behrig@uni-potsdam.de, eva.leith, (2) University of Life Sciences in Poznan, Department of Agrometeorology, Piatkowska 94, 60-649 Poznan, Poland, chojnick@au.poznan.pl, radjusz@au.poznan.pl, tserba@wp.pl