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@PHDTHESIS{Drewes:49543,
      author       = {Drewes, Norbert},
      title        = {{U}msatz verschiedener {E}rnterückstände in einem
                      {B}odensäulenversuchssystem - {E}influss auf die organische
                      {B}odensubstanz und den {T}ransport zweier {X}enobiotika.},
      volume       = {59},
      school       = {RWTH Aachen},
      type         = {Dr. (Univ.)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-49543},
      isbn         = {3-89336-417-X},
      series       = {Schriften des Forschungszentrums Jülich. Reihe Umwelt /
                      Environment},
      pages        = {XI, 201 S.},
      year         = {2005},
      note         = {Record converted from VDB: 12.11.2012; RWTH Aachen, Diss.,
                      2005},
      abstract     = {Knowledge about the formation and structure of soil organic
                      matter provides essential contributions towards
                      understanding fundamental soil functions and thus
                      contributes to securing a high-yielding and sustainable
                      agriculture. With a view to the translocation or
                      immobilization and the conversion of widely differing
                      xenobiotics, soil organic matter has frequently received
                      attention in numerous studies. In the present study, the
                      conversion of four different crop residues (maize straw,
                      sugar beet leaves freeze-dried, oat straw, rape straw),
                      applied in quantities as usual in agricultural practice, and
                      their impact on the transport behaviour of the two
                      xenobiotics benzo[a]pyrene and benazolin was investigated in
                      soil column experiments with undisturbed soil cores (40 cm
                      length, 20 cm diameter) of an orthic luvisol. In addition, a
                      soil column variant without crop residues was examined for
                      comparison. During the experimental period, different
                      physical and chemical parameters were observed in the soil
                      of the soil cores and in the percolate. Particular attention
                      was given here to the structure of the soil organic matter,
                      which was investigated by different spectroscopic methods.
                      The results of the study can be summarized as follows: •
                      The conversion of the different crop residues was observed
                      for twelve weeks by measuring soil respiration rates.
                      Subsequently, selected soil columns were segmented and the
                      elemental composition of the soil segments analysed. During
                      the experimental period, the pH value and the DOC content in
                      the percolate were determined. By recording the soil
                      respiration rates it was possible to reproduce both the
                      quality of the crop residues and the conversion profile.
                      Thus, for example, the freeze-dried beet leaves with soil
                      respiration rates of 10 g ⋅ m$^{–1}$ h$^{-1}$ were
                      converted much faster than the other crop residues. The
                      influence of soil tillage operations prior to incorporating
                      the crop residues on the activity of soil microorganisms was
                      also documented. This technique newly introduced at the
                      institute has proved very efficient and can be a valuable
                      aid in further noninvasive studies of microbial activity.
                      Sampling times can also be better defined by accompanying
                      measurements. • The discharge of dissolved organic carbon
                      was observed for twelve weeks after incorporating the crop
                      residues. The DOC concentrations in the percolate of the
                      soil columns varied significantly both within one variant
                      and between the soil columns. DOC concentrations between
                      approx. 30 mg ⋅ L$^{-1}$ and more than 2500 mg ⋅
                      L$^{-1}$ were measured in the percolate. For the extremely
                      high DOC concentrations no parallel was found for other
                      experimental arrangements in the literature. Nevertheless,
                      the critical micelle concentration was not attained. The
                      incorporation of the crop residues led to an increase in DOC
                      concentration in nearly all the soil columns and then
                      decreased [...]},
      cin          = {ICG-IV},
      ddc          = {333.7},
      cid          = {I:(DE-Juel1)VDB50},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/49543},
}