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@INPROCEEDINGS{Krause:837577,
      author       = {Krause, Lars and Rodionov, Andrei and Schweizer, Steffen A.
                      and Lehndorff, Eva and Klumpp, Erwin and Amelung, Wulf},
      title        = {{T}exture controls on the size distribution and properties
                      of nano- and small microaggregates in soil},
      reportid     = {FZJ-2017-06465},
      year         = {2017},
      abstract     = {Soil microaggregates (SMA) with a size of <250 µm are one
                      of the key factors influencing soil properties of ecological
                      and structural relevance. In order to better understand
                      their role in soil ecosystems, a quantitative understanding
                      about the building units (BU) is necessary. The BU (divided
                      into small SMA (<20 µm) and nanoparticles (NP, <220 nm))
                      where analyzed to quantify their size distribution and
                      chemical composition. This approach will help to evaluate
                      the properties of BU required for SMA formation.Soils with
                      different clay contents of a Luvisol site (Scheyern,
                      Germany) were fractionated into SMA and NP by wet sieving
                      and pressure filtration. The differentiation between free
                      and occluded BU was carried out by mechanical disaggregation
                      using ultrasonic treatment. The size distribution of small
                      SMA was analyzed with a XPT particle analyzer, while the
                      abundance and chemical composition of NP were analyzed by
                      field flow fractionation (AF4) coupled to a UV detector and
                      ICP-MS.According to the mass distribution of the
                      macroaggregate (8 mm-250 µm), large and small SMA
                      fractions, the soils could be grouped into low (15, 18 and
                      $19\%)$ and high (28 and $30\%)$ clay content. The
                      proportion of occluded small and large SMA was increased
                      with clay content. Interestingly the free small SMA
                      proportion was constant and independent from clay content.
                      Also the particle size distribution (PSD) of free small SMA
                      did not correlate with clay content. The similar PSD of free
                      and occluded small SMA was interpreted as a pool of
                      potential BU for the formation of new aggregates. The NP
                      showed three different size fractions. The evaluation of the
                      elements Al, Si and Fe in these size fractions revealed
                      different mass ratios and gave an insight into the
                      composition of free and occluded NP.},
      month         = {Sep},
      date          = {2017-09-02},
      organization  = {DBG Jahrestagung, Göttingen
                       (Germany), 2 Sep 2017 - 7 Sep 2017},
      subtyp        = {Other},
      cin          = {IBG-3},
      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)6},
      url          = {https://juser.fz-juelich.de/record/837577},
}