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@ARTICLE{deWilligen:22888,
      author       = {de Willigen, P. and van Dam, J.C. and Javaux, M. and
                      Heinen, M.},
      title        = {{R}oot {W}ater {U}ptake as {S}imulated by {T}hree {S}oil
                      {W}ater {F}low {M}odels},
      journal      = {Vadose zone journal},
      volume       = {11},
      number       = {3},
      issn         = {1539-1663},
      address      = {Madison, Wis.},
      publisher    = {SSSA},
      reportid     = {PreJuSER-22888},
      year         = {2012},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {We compared four root water uptake (RWU) models of
                      different complexity that are all embedded in greater soil
                      water flow models. The soil models used were SWAP
                      (one-dimensional), FUSSIM2 (two-dimensional), and RSWMS
                      (three-dimensional). Within SWAP, two RWU functions were
                      utilized (SWAP-macro and SWAP-micro). The complexity of the
                      processes considered in RWU increases from SWAP-macro, to
                      SWAP-micro, to FUSSIM2, to RSWMS. The objective of our study
                      was to determine to what extent the RWU models differed when
                      tested under extreme conditions: low root length density,
                      high transpiration rate, and low water content. Comparison 1
                      looked at the results of the models for a scenario of
                      transpiration and uptake and Comparison 2 studied
                      compensation mechanisms of water uptake. The uptake scenario
                      pertained to a long dry period with constant transpiration
                      and a single rainfall event. As could be expected, the
                      models yielded different results in Comparison 1, but the
                      differences in cumulative transpiration were modest due to
                      various feedback mechanisms. In Comparison 2, the cumulative
                      effect of different feedback processes were studied.
                      Redistribution of water due to soil pressure head gradients
                      generated by water uptake led to an increase in cumulative
                      transpiration of $32\%,$ and the inclusion of compensation
                      in uptake by the roots resulted in a further increase of
                      $10\%.$ Going from one-to three-dimensional modeling, the
                      horizontal gradients in the soil and root system increased,
                      which reduced the actual transpiration. The analysis showed
                      that both soil physical and root physiological factors are
                      important for proper deterministic modeling of RWU.},
      keywords     = {J (WoSType)},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Environmental Sciences / Soil Science / Water Resources},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000308526800032},
      doi          = {10.2136/vzj2012.0018},
      url          = {https://juser.fz-juelich.de/record/22888},
}