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@ARTICLE{Meyer:835194,
      author       = {Meyer, N. and Bornemann, L. and Welp, G. and Schiedung,
                      Henning and Herbst, Michael and Amelung, Wulf},
      title        = {{C}arbon saturation drives spatial patterns of soil organic
                      matter losses under long-term bare fallow},
      journal      = {Geoderma},
      volume       = {306},
      issn         = {0016-7061},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2017-05048},
      pages        = {89 - 98},
      year         = {2017},
      abstract     = {Spatial controls of soil organic carbon (SOC) turnover are
                      not well understood. We hypothesized that spatialpatterns of
                      SOC turnover are related to carbon (C) saturation rather
                      than to the size of measurable SOC-poolssuch as particulate
                      organic matter (POM), determined as SOC in particle-size
                      fractions. Therefore, we repeatedlygrid-sampled a field
                      after one, three, seven, and eleven years under bare fallow
                      management, which revealed aspatial gradient from high to
                      low degrees of C saturation. We measured the contents of SOC
                      and the contents ofSOC in coarse sand-size (2000–250 μm,
                      POM1), fine sand-size (250–53 μm, POM2), silt-size
                      (53–20 μm, POM3),and fine silt to clay-size fractions
                      (nonPOM,< 20 μm), calculated the degree of C saturation
                      from texturalproperties and nonPOM contents, and related
                      these parameters to SOC losses. In the first year of bare
                      fallow, thesoil contained on average 12.1 g SOC kg−1, of
                      which 0.6 g kg−1, 1.7 g kg−1, and 2.1 g kg−1 were lost
                      afterthree, seven, and eleven years of bare fallow,
                      respectively. The SOC losses within eleven years were
                      spatiallyvariable and varied between $1\%$ and $46\%$
                      relative to the initial SOC content. In support of our
                      hypothesis, SOClosses were largest at subsites with largest
                      degrees of C saturation (R2 =0.83). Although the POM
                      fractionsdeclined most drastically, they only comprised 4 to
                      $9\%$ of bulk SOC, and they did neither correlate with
                      norexplain spatial patterns of SOC losses. We conclude that
                      the concept of C saturation is superior to
                      conventionalphysical fractionation approaches for predicting
                      spatio-temporal patterns of SOC turnover at sites with a
                      highdegree of C saturation.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000409291000011},
      doi          = {10.1016/j.geoderma.2017.07.004},
      url          = {https://juser.fz-juelich.de/record/835194},
}