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@ARTICLE{Weihermller:5537,
      author       = {Weihermüller, L. and Huisman, J. A. and Graf, A. and
                      Herbst, M. and Séquaris, J.-M.},
      title        = {{M}ultistep {O}utflow {E}xperiments to {D}etermine {S}oil
                      {P}hysical and {C}arbon {D}ioxide {P}roduction {P}arameters},
      journal      = {Vadose zone journal},
      volume       = {8},
      issn         = {1539-1663},
      address      = {Madison, Wis.},
      publisher    = {SSSA},
      reportid     = {PreJuSER-5537},
      pages        = {772 - 782},
      year         = {2009},
      note         = {We want to thank H. Hardelauf for the implementation of all
                      necessary features into the SOILCO2-RothC code. We also want
                      to thank C. Walraf for the C-pool fractionation and T.
                      Schuster for his helpful hands during the experimental
                      setup. This research was supported by the German Research
                      Foundation DFG (Transregional Collaborative Research Centre
                      32-Patterns in Soil-Vegetation-Atmosphere Systems:
                      Monitoring, Modelling, and Data Assimilation).},
      abstract     = {Soil water content (SWC) plays a crucial role in the
                      production and transport of CO2 in soils. Classical
                      approaches estimating the effects of SWC on soil respiration
                      are incubation experiments, where soil structure is
                      disturbed and processes are neglected. Nevertheless, such
                      data govern the water reduction function of C turnover
                      models. our approach, the water reduction control parameters
                      (WRCP) of a water reduction function were estimated from
                      experiments using inverse modeling. Therefore, we used the
                      SOILCO2-RothC model in combination with multistep outflow
                      (MSO) experiments. First, the effective hydraulic properties
                      were estimated and then used in a second to estimate the
                      WRCP and rate constants of the resistant plant material
                      (RPM) C pool. The results showed the estimated hydraulic
                      parameters can be used for the prediction of CO2 production
                      and transport of a second experiment only if the WRCP and
                      the C turnover rate of the RPM pool of RothC will also be
                      optimized. Optimizing the WRCP matched the CO2 efflux fairly
                      well but the WRCP at the highest matric potential, which
                      determines the of reduction, was too low at -1.61 cm and
                      (water-filled pore space [WFPS] = $99.9\%).$ Calibrating
                      both WRCP and the rate constant matched the efflux again
                      fairly well and the results indicate a reduction of optimal
                      CO2 production water contents of 0.224 m(3) m(-3) or
                      $53.3\%$ WFPS. Also, the estimated RPM rate constant seems
                      to be in a reasonable at k(RPM) = 2.5791 x 10(-7) cm(-1).},
      keywords     = {J (WoSType)},
      cin          = {ICG-4},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB793},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Environmental Sciences / Soil Science / Water Resources},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000268871900024},
      doi          = {10.2136/vzj2008.0041},
      url          = {https://juser.fz-juelich.de/record/5537},
}