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@ARTICLE{Moradi:890019,
      author       = {Moradi, Ghazal and Bol, Roland and Trbojevic, Luka and
                      Missong, Anna and Mörchen, Ramona and Fuentes, Barbara and
                      May, Simon M. and Lehndorff, Eva and Klumpp, Erwin},
      title        = {{C}ontrasting depth distribution of colloid-associated
                      phosphorus in the active and abandoned sections of an
                      alluvial fan in a hyper-arid region of the {A}tacama
                      {D}esert},
      journal      = {Global and planetary change},
      volume       = {185},
      issn         = {0921-8181},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2021-00613},
      pages        = {103090 -},
      year         = {2020},
      abstract     = {Colloids and their subset nanoparticles are key soil
                      constituents for nutrient and Organic Carbon (OC) storage
                      and transport, yet little is known about their specific role
                      in overall transfer of elements under hyper-arid conditions.
                      We analyzed the Water Dispersible Colloids (WDCs) of two
                      adjacent soil profiles, located either on the active (named:
                      Fan) or passive (named: Crust) sections of an alluvial fan.
                      Colloidal particles (<500 nm) were fractionated using
                      Asymmetric Field-Flow-Field Fractionation (AF4), which was
                      coupled online to an Inductively Coupled Plasma-Mass
                      Spectrometer (ICP-MS) and an Organic Carbon Detector (OCD)
                      to detect the composition of size-fractionated colloids.
                      Three size categories of particles were identified:
                      nanoparticles (0.6–24 nm), fine colloids (24–210 nm),
                      and medium colloids (210–500 nm). The two profiles
                      differed distinctively in vertical WDC distribution and
                      associated phosphorus (P) content. Fractograms of the Crust
                      profile predominantly showed fine colloids, whereas the
                      medium-sized colloids dominated those of the Fan.
                      Furthermore, the highest colloid content in the Crust
                      profile was found at the surface, while in the Fan, colloids
                      accumulated at 10–20 cm depth, thus overall reflecting the
                      different genesis and infiltration capacities of the soils.
                      Despite very low concentration of colloidal P in these
                      hyper-arid soils, a strong correlation between colloidal P
                      and calcium (Ca), Silica (Si), aluminum (Al), iron (Fe), and
                      OC content were found. This also revealed Ca-phosphates as
                      the primary P retention from, with the association of P to
                      phyllosilicates and Fe/Al (hydr-) oxides as the main soil
                      colloidal fractions. Overall, our results did highlight that
                      small local scale differences in topographic-derived
                      distribution of water flow pathways, defined the formation
                      of the crust-like surfaces, and ultimately the overall
                      movement and distribution of nanoparticles and colloids in
                      soil profiles under hyper-arid conditions.},
      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:000510315900010},
      doi          = {10.1016/j.gloplacha.2019.103090},
      url          = {https://juser.fz-juelich.de/record/890019},
}