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@ARTICLE{Couvreur:187133,
      author       = {Couvreur, V. and Vanderborght, J. and Draye, X. and Javaux,
                      M.},
      title        = {{D}ynamic aspects of soil water availability for isohydric
                      plants: {F}ocus on root hydraulic resistances},
      journal      = {Water resources research},
      volume       = {50},
      number       = {11},
      issn         = {0043-1397},
      address      = {Washington, DC},
      publisher    = {AGU},
      reportid     = {FZJ-2015-00807},
      pages        = {8891 - 8906},
      year         = {2014},
      abstract     = {Soil water availability for plant transpiration is a key
                      concept in agronomy. The objective of this study is to
                      revisit this concept and discuss how it may be affected by
                      processes locally influencing root hydraulic properties. A
                      physical limitation to soil water availability in terms of
                      maximal flow rate available to plant leaves ( inline image)
                      is defined. It is expressed for isohydric plants, in terms
                      of plant-centered variables and properties (the equivalent
                      soil water potential sensed by the plant, inline image; the
                      root system equivalent conductance, inline image; and a
                      threshold leaf water potential, inline image). The resulting
                      limitation to plant transpiration is compared to commonly
                      used empirical stress functions. Similarities suggest that
                      the slope of empirical functions might correspond to the
                      ratio of inline image to the plant potential transpiration
                      rate. The sensitivity of inline image to local changes of
                      root hydraulic conductances in response to soil matric
                      potential is investigated using model simulations. A
                      decrease of radial conductances when the soil dries induces
                      earlier water stress, but allows maintaining higher night
                      plant water potentials and higher inline image during the
                      last week of a simulated 1 month drought. In opposition, an
                      increase of radial conductances during soil drying provokes
                      an increase of hydraulic redistribution and inline image at
                      short term. This study offers a first insight on the effect
                      of dynamic local root hydraulic properties on soil water
                      availability. By better understanding complex interactions
                      between hydraulic processes involved in soil-plant
                      hydrodynamics, better prospects on how root hydraulic traits
                      mitigate plant water stress might be achieved.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {246 - Modelling and Monitoring Terrestrial Systems: Methods
                      and Technologies (POF2-246) / 255 - Terrestrial Systems:
                      From Observation to Prediction (POF3-255)},
      pid          = {G:(DE-HGF)POF2-246 / G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000346654600028},
      doi          = {10.1002/2014WR015608},
      url          = {https://juser.fz-juelich.de/record/187133},
}