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@ARTICLE{Krause:845990,
      author       = {Krause, Lars and Rodionov, Andrei and Schweizer, Steffen A.
                      and Siebers, Nina and Lehndorff, Eva and Klumpp, Erwin and
                      Amelung, Wulf},
      title        = {{M}icroaggregate stability and storage of organic carbon is
                      affected by clay content in arable {L}uvisols},
      journal      = {Soil $\&$ tillage research},
      volume       = {182},
      issn         = {0167-1987},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2018-03162},
      pages        = {123 - 129},
      year         = {2018},
      abstract     = {As soil microaggregates (<250 μm, SMA) usually withstand
                      long-term tillage, we hypothesized that i) elevated clay
                      contents in arable soil support aggregation already at
                      microaggregate level, leading to ii) increasing organic
                      carbon (SOC) enrichment in smaller SMA size fractions. To
                      test these hypotheses we sampled the topsoil (5–20 cm)
                      of Luvisols with a long history of agricultural management
                      at the Scheyern experiment station (Germany) in
                      quintuplicates from each of five subsites with different
                      clay contents $(19–34\%).$ The field-fresh topsoil was
                      fractionated into macroaggregates (8000–250 μm), large
                      SMA (250–20 μm), and small SMA (<20 μm) and the mass
                      distribution was recorded. In addition, the water stable
                      macroaggregates (>250 μm) were dispersed ultrasonically
                      to study occluded SMA and single building units. Finally, we
                      analyzed the size distribution of the small SMA by laser
                      diffraction analysis. The total mass distribution of free
                      and occluded SMA grouped soils into those with small (19,
                      22, and $24\%)$ and large (32 and $34\%)$ clay contents. The
                      finer textured soils exhibited larger portions of occluded
                      SMA, with a gamma size distribution of small SMA peaking at
                      6 μm. Yet the occluded small SMA in the finer textured
                      soils showed an additional enrichment of colloids <1 μm.
                      The SOC was indeed enriched in finer fractions, but more in
                      the small SMA of the coarse textured sites than in the finer
                      textured ones, whereas the opposite was true for the large
                      SMA. We conclude, therefore, that elevated contents of
                      clay-sized particles promote SMA formation and
                      stabilization, therewith shifting SOC enrichment from small
                      to larger SMA.},
      cin          = {IBG-3},
      ddc          = {630},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255) / MAD Soil - MAD Soil - Microaggregates:
                      Formation and turnover of the structural building blocks of
                      soils (251268514)},
      pid          = {G:(DE-HGF)POF3-255 / G:(GEPRIS)251268514},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000436651400013},
      doi          = {10.1016/j.still.2018.05.003},
      url          = {https://juser.fz-juelich.de/record/845990},
}