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@ARTICLE{Nguyen:889160,
      author       = {Nguyen, Thuy Huu and Langensiepen, Matthias and
                      Vanderborght, Jan and Hüging, Hubert and Mboh, Cho Miltin
                      and Ewert, Frank},
      title        = {{C}omparison of root water uptake models in simulating
                      ${CO}\<sub\>2\</sub\>$ and ${H}\<sub\>2\</sub\>{O}$ fluxes
                      and growth of wheat},
      journal      = {Hydrology and earth system sciences},
      volume       = {24},
      number       = {10},
      issn         = {1607-7938},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2021-00083},
      pages        = {4943 - 4969},
      year         = {2020},
      abstract     = {Stomatal regulation and whole plant hydraulic signaling
                      affect water fluxes and stress in plants. Land surface
                      models and crop models use a coupled
                      photosynthesis–stomatal conductance modeling approach.
                      Those models estimate the effect of soil water stress on
                      stomatal conductance directly from soil water content or
                      soil hydraulic potential without explicit representation of
                      hydraulic signals between the soil and stomata. In order to
                      explicitly represent stomatal regulation by soil water
                      status as a function of the hydraulic signal and its
                      relation to the whole plant hydraulic conductance, we
                      coupled the crop model LINTULCC2 and the root growth model
                      SLIMROOT with Couvreur's root water uptake model (RWU) and
                      the HILLFLOW soil water balance model. Since plant hydraulic
                      conductance depends on the plant development, this model
                      coupling represents a two-way coupling between growth and
                      plant hydraulics. To evaluate the advantage of considering
                      plant hydraulic conductance and hydraulic signaling, we
                      compared the performance of this newly coupled model with
                      another commonly used approach that relates root water
                      uptake and plant stress directly to the root zone water
                      hydraulic potential (HILLFLOW with Feddes' RWU model).
                      Simulations were compared with gas flux measurements and
                      crop growth data from a wheat crop grown under three water
                      supply regimes (sheltered, rainfed, and irrigated) and two
                      soil types (stony and silty) in western Germany in 2016. The
                      two models showed a relatively similar performance in the
                      simulation of dry matter, leaf area index (LAI), root
                      growth, RWU, gross assimilation rate, and soil water
                      content. The Feddes model predicts more stress and less
                      growth in the silty soil than in the stony soil, which is
                      opposite to the observed growth. The Couvreur model better
                      represents the difference in growth between the two soils
                      and the different treatments. The newly coupled model
                      (HILLFLOW–Couvreur's RWU–SLIMROOT–LINTULCC2) was also
                      able to simulate the dynamics and magnitude of whole plant
                      hydraulic conductance over the growing season. This
                      demonstrates the importance of two-way feedbacks between
                      growth and root water uptake for predicting the crop
                      response to different soil water conditions in different
                      soils. Our results suggest that a better representation of
                      the effects of soil characteristics on root growth is needed
                      for reliable estimations of root hydraulic conductance and
                      gas fluxes, particularly in heterogeneous fields. The newly
                      coupled soil–plant model marks a promising approach but
                      requires further testing for other scenarios regarding
                      crops, soil, and climate.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255) / DFG project 15232683 - TRR 32: Muster und
                      Strukturen in Boden-Pflanzen-Atmosphären-Systemen:
                      Erfassung, Modellierung und Datenassimilation},
      pid          = {G:(DE-HGF)POF3-255 / G:(GEPRIS)15232683},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000585918000001},
      doi          = {10.5194/hess-24-4943-2020},
      url          = {https://juser.fz-juelich.de/record/889160},
}