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@ARTICLE{Bornemann:17192,
      author       = {Bornemann, L. and Herbst, M. and Welp, G. and Vereecken, H.
                      and Amelung, W.},
      title        = {{R}ock {F}ragments {C}ontrol {S}ize and {S}aturation of
                      {O}rganic {C}arbon {P}ools in {A}gricultural {T}opsoil},
      journal      = {Soil Science Society of America journal},
      volume       = {75},
      issn         = {0361-5995},
      address      = {Madison, Wis.},
      publisher    = {SSSA},
      reportid     = {PreJuSER-17192},
      pages        = {1898 - 1907},
      year         = {2011},
      note         = {We thank Sven-Oliver Franz for <SUP>137</SUP>Cs
                      measurements and Armin Skowronek for assistance in soil
                      classification. Financial support was received by the
                      Deutsche Forschungsgemeinschaft (DFG), Subproject B3 of the
                      Transregional Collaborative Research Centre 32 "Patterns in
                      Soil-Vegetation-Atmosphere Systems."},
      abstract     = {Rock fragments (RF) may severely reduce the amount of fine
                      earth (FE) per soil volume. Here we quantified the effect of
                      variable RF on spatial patterns of bulk soil organic carbon
                      (SOC), particulate organic matter (POM) of three size
                      classes, nonparticulate organic matter (nonPOM), and black
                      carbon (BC). One hundred and twenty-nine soil samples (0-30
                      cm) were taken in a regular grid on an arable field nearby
                      Selhausen (Germany). The weakly inclined site featured a
                      strong gradient in RF, soil types covered Alfic Eutrochepts,
                      as well as Typic and Albaquic Hapludalfs. In addition to
                      C-pool patterns and RF we determined texture, Fe oxides,
                      soil moisture, as well as hillslope and elevation above sea
                      level. Additionally, Cs-137 measurements were conducted to
                      indicate soil erosion. The reduction of SOC stocks by
                      increasing amounts of RF on a percentage basis was smaller
                      than attributable to mere dilution effects. Multiple
                      regression analysis indicated BETA values of 0.65 to 0.73
                      between RF and FE contents of BC, nonPOM, and the finest POM
                      fraction. The C contents of the coarse POM fractions were
                      positively correlated with the amount of RF (R-2 =
                      0.72-0.78) and their spatial patterns were assumed to be
                      caused by disproportionate input of plant litter to a
                      reduced solum when the amount of RF increased. Statistical
                      structure analysis and variography pointed to hierarchical C
                      saturation of nonPOM and the finest POM fraction, which was
                      additionally regulated by Fe oxide contents. Only the
                      spatial distribution of BC (BETA = -0.15) was affected by
                      erosion.},
      keywords     = {J (WoSType)},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Soil Science},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000294810500030},
      doi          = {10.2136/sssaj2010.0454},
      url          = {https://juser.fz-juelich.de/record/17192},
}