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@ARTICLE{Groh:811917,
      author       = {Groh, Jannis and Vanderborght, Jan and Pütz, Thomas and
                      Vereecken, Harry},
      title        = {{H}ow to {C}ontrol the {L}ysimeter {B}ottom {B}oundary to
                      {I}nvestigate the {E}ffect of {C}limate {C}hange on {S}oil
                      {P}rocesses?},
      journal      = {Vadose zone journal},
      volume       = {15},
      number       = {7},
      issn         = {1539-1663},
      address      = {Madison, Wis.},
      publisher    = {SSSA},
      reportid     = {FZJ-2016-04231},
      pages        = {15},
      year         = {2016},
      abstract     = {A dynamic tension-controlled bottom boundary of lysimeters
                      allows observing water and matter fluxes in lysimeters that
                      are close to natural field conditions, as pressure heads at
                      the lysimeter bottom are adjusted to measured pressure heads
                      at the same depth in the surrounding field. However
                      lysimeters are often transferred from their sampling
                      location for practical reasons or to study, for example, the
                      effect of climate change on soil functions. This transfer
                      can be accompanied by a change aboveground but also in
                      subsurface conditions that are used to control the bottom
                      boundary and that may affect the soil water balance of
                      lysimeters. This issue is also relevant for lysimeter
                      stations which use a tension-controlled bottom boundary and
                      are not directly installed near the site of excavation. The
                      potential impact of different bottom boundary conditions on
                      the water balance of lysimeters that were transferred in a
                      climate impact experiment (SOILCan) was investigated
                      exemplarily by a numerical study. Results showed that by
                      using nonappropriate pressure heads, which were measured in
                      soil profiles with a different texture and water table depth
                      than the profile where the lysimeter was taken from, had
                      partially large impacts on soil water fluxes, especially
                      when the water table was located within a specific critical
                      range. Different climate conditions between sampling and
                      installation site were buffered by the soil and did not show
                      a strong influence on the bottom boundary control of
                      lysimeters when the groundwater table depth was assumed to
                      remain constant. Considering a change in groundwater table
                      depths due to changing climate tempered the effects of
                      climate change on the soil water balance terms. In general,
                      results demonstrate the importance of a proper control of
                      the lysimeters bottom boundary conditions in studies that
                      investigate the influence of climate change on soil
                      functions and ecosystem variables by transferring lysimeter
                      along climate gradients.},
      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:000381301700003},
      doi          = {10.2136/vzj2015.08.0113},
      url          = {https://juser.fz-juelich.de/record/811917},
}