B31B-0546
Net carbon balance of three full crop rotations at an agricultural site near Gebesee, Germany
Wednesday, 16 December 2015
Poster Hall (Moscone South)
Miriam Hurkuck1, Christian Brümmer1, Olaf Kolle2, Werner Leo Kutsch3, Antje Maria Moffat1, Kanisios Mukwashi1, Sina C Truckenbrodt4 and Mathias Herbst1, (1)Thunen Institute of Climate Smart Agriculture, Braunschweig, Germany, (2)Max Planck Institute for Biogeochemistry, Jena, Germany, (3)University of Helsinki, Helsinki, Finland, (4)Friedrich Schiller University of Jena, Jena, Germany
Abstract:
Continuous eddy-covariance (EC) measurements of biosphere-atmosphere CO2 and H2O exchange have been conducted since 2001 at an agricultural site near Gebesee, Germany, thus providing one of the longest EC time series of European croplands. During the experimental period, winter wheat and winter barley were alternately planted with potatoes, sugar beet, rape, and peppermint covering three full crop rotations (2001-2004, 2005-2009, and 2010-2014). In this study, data of 14 years of net ecosystem CO2 exchange (NEE) and evapotranspiration (E) were re-calculated. Based on these data, we present the net carbon (C) balance (net biome production, NBP) accounting for any additional C input by fertilization and C output by harvest. Further emphasis was placed on the sensitivity of water use efficiency (WUE) and E to climate and crop type. The main aim was to investigate the interannual variability in both NBP and WUE, thus disentangling the impacts of climatic conditions and land management on the net C balance as well as on WUE and E.
