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@ARTICLE{Dold:888313,
      author       = {Dold, Christian and Wacha, K. M. and Sauer, T. J. and
                      Hatfield, J. L. and Prueger, J. H.},
      title        = {{M}easured and simulated carbon dynamics in {M}idwestern
                      {US} corn‐soybean rotations},
      journal      = {Global biogeochemical cycles},
      volume       = {35},
      number       = {1},
      issn         = {1944-9224},
      address      = {Hoboken, NJ},
      publisher    = {Wiley},
      reportid     = {FZJ-2020-04833},
      pages        = {e2020GB006685},
      year         = {2021},
      abstract     = {Corn (Zea mays L.) and soybean (Glycine max [L.] Merr.)
                      production dominate Midwestern U.S. agriculture and impact
                      the regional carbon and nitrogen cycles. Sustaining soil
                      carbon is important for corn‐soybean production (CS);
                      however, quantifying soil carbon changes requires
                      long‐term field measurements and/or model simulations. In
                      this study, changes in soil organic (SOC), inorganic (SIC),
                      and total (TC) carbon; pH; total nitrogen (TN); and net
                      ecosystem production (NEP) were measured in a conventional
                      corn‐soybean rotation in central Iowa. Soil samples (n =
                      42; 0–120 cm depth) were collected from two adjacent
                      fields in 2005 and 2016. Eddy‐flux stations set up in the
                      fields continuously monitored NEP from 2005–2016, and net
                      biome production (NBP) was calculated using yield records.
                      The DayCENT model was used to simulate the effects of
                      conventional management practices on soil carbon and
                      calibrated with field‐measured NEP and SOC. Measured soil
                      TC (0–120 cm) decreased by −14.19 ± 6.25 Mg ha−1,
                      with highest reductions in SOC and SIC (p < 0.05) at 0–15
                      and 90–120 cm, respectively. Measured TN decreased by
                      −0.7 ± 0.29 Mg ha−1 with N‐accumulation at 60–90 cm
                      (p < 0.05). Eddy‐flux NBP decreased by −13.19 ± 0.05 Mg
                      ha−1. Soil and eddy‐flux records show a carbon reduction
                      by −1.14 ± 0.63 and −1.20 ± 0.06 Mg ha−1 yr−1,
                      respectively. The validated DayCENT model suggests that all
                      SOC pools declined. We postulate that conventional CS
                      production has adverse effects on C and N dynamics in
                      Midwestern United States.},
      cin          = {IBG-3},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255) / 2173 - Agro-biogeosystems: controls, feedbacks
                      and impact (POF4-217)},
      pid          = {G:(DE-HGF)POF3-255 / G:(DE-HGF)POF4-2173},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000613330700003},
      doi          = {10.1029/2020GB006685},
      url          = {https://juser.fz-juelich.de/record/888313},
}