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@ARTICLE{Brosens:904445,
      author       = {Brosens, Liesa and Robinet, Jérémy and Pelckmans, Ignace
                      and Ameijeiras-Mariño, Yolanda and Govers, Gerard and
                      Opfergelt, Sophie and Minella, Jean P. G. and Vanderborght,
                      Jan},
      title        = {{H}ave land use and land cover change affected soil
                      thickness and weathering degree in a subtropical region in
                      {S}outhern {B}razil? {I}nsights from applied mid-infrared
                      spectroscopy},
      journal      = {Catena},
      volume       = {207},
      issn         = {0008-7769},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2021-06015},
      pages        = {105698 -},
      year         = {2021},
      abstract     = {Land use and land cover changes (LUCC) can drastically
                      alter various components of the critical zone, including
                      soil thickness and soil chemical weathering processes. Often
                      these studies, however, tend to focus on extreme cases, not
                      representing what actually happens on average at larger,
                      regional scales. Here, we evaluate the impact of LUCC on
                      soil thickness and soil weathering degree at the regional
                      scale, where we use soil spectroscopy to derive weathering
                      indices. In a subtropical region in Southern Brazil, we
                      collected calibration/validation soil samples (n = 49) from
                      4 different locations for which we measured the mid-infrared
                      (MIR) spectral reflectance and 3 soil chemical weathering
                      indices: chemical index of alteration (CIA), the total
                      reserve in bases (TRB), and the iron ratio (Fed/Fet). We
                      used partial least square regressions on this
                      calibration/validation dataset to relate the MIR spectra of
                      the soil samples to these weathering indices, resulting in
                      good calibration relationships with R2 values of 0.97, 0.91
                      and 0.84 for CIA, TRB and Fed/Fet, respectively. Applying
                      these relations to MIR spectra of regionally collected soil
                      samples allowed us to calculate soil weathering degrees for
                      a large number of soil samples (n = 229), without requiring
                      costly and time-consuming chemical analyses. We collected
                      these soil samples at 100 mid-slope positions: 50 under
                      forest and 50 under agricultural land use. Land use
                      explained only a minor part of the variation in soil
                      thickness and weathering degree. Thus, while local water and
                      tillage erosion rates might be considerable after
                      deforestation, this has not led to significant reductions in
                      average soil thickness and has not affected soil weathering
                      degree. Slope gradient is the main factor influencing the
                      spatial variability in soil thickness and weathering degree
                      on mid-slope sections in our study area. Human activities
                      over the last century did not fundamentally alter these
                      patterns.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217)},
      pid          = {G:(DE-HGF)POF4-2173},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000703268900111},
      doi          = {10.1016/j.catena.2021.105698},
      url          = {https://juser.fz-juelich.de/record/904445},
}