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Volume 16 Issue 9, September 2017



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    • Francois Tardieu, Xavier Draye and Mathieu Javaux
      Root Water Uptake and Ideotypes of the Root System: Whole-Plant Controls Matter
      Core Ideas
      • The threshold soil water potential for water uptake depends on stomatal control.
      • Whole-plant transpiration increases hydraulic conductance in roots and shoots.
      • It decreases the rhizosphere hydraulic conductance, resulting in feedback loops.
      • Root system ideotypes for water uptake are not always associated with the best yields.
      • Models integrating controls in shoots and roots are needed to optimize root traits.
      doi:10.2136/vzj2017.05.0107
      Vadose Zone Journal 2017 16:
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      unlockOPEN ACCESS
  • ORIGINAL RESEARCH up

    • Eva Kroener, Gaylon S. Campbell and Marco Bittelli
      Estimation of Thermal Instabilities in Soils around Underground Electrical Power Cables
      Core Ideas
      • We studied coupled water, vapor, and heat flow around underground cables.
      • There is a water–vapor flow cycle in the soil around these cables.
      • This water–vapor cycle breaks down at the critical heat dissipation rate.
      • The critical heat dissipation rate depends on soil hydraulic properties.
      doi:10.2136/vzj2017.04.0082
      Vadose Zone Journal 2017 16:
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    • Ashley Paradiś, Christopher Brueck, Douglas Meisenheimer, Thomas Wanzek and Maria Ines Dragila
      Sandy Soil Microaggregates: Rethinking Our Understanding of Hydraulic Function
      Core Ideas
      • Sandy soil microaggregates are comprised of a solid sand core encrusted with fines.
      • Thick films control a significant proportion of water retention in coarse sandy soil.
      • Three water pools drain sequentially: capillary water, thick films, and adsorptive films.
      • Film seepage rates should be considered when irrigating sandy soil.
      doi:10.2136/vzj2017.05.0090
      Vadose Zone Journal 2017 16:
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      [ Supplement 1 ]
    • Alessandra Calegari da Silva, Robson André Armindo, Alexsandro dos Santos Brito and Marcel G. Schaap
      An Assessment of Pedotransfer Function Performance for the Estimation of Spatial Variability of Key Soil Hydraulic Properties
      Core Ideas
      • PTFs have been widely applied in environmental and hydrological watershed studies.
      • PTFs can simulate the spatial variability of hydraulic functions.
      • The simulation of hydraulic maps using PTF data should be performed with care.
      doi:10.2136/vzj2016.12.0139
      Vadose Zone Journal 2017 16:
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    • Kristin M. Sample-Lord and Charles D. Shackelford
      Apparatus for Measuring Coupled Membrane and Diffusion Behavior of Unsaturated Sodium Bentonite
      Core Ideas
      • Coupled membrane and diffusion behavior was measured in unsaturated Na-bentonite.
      • A new testing apparatus advances the state of the art for coupled processes in clays.
      • The membrane efficiency of Na-bentonite increased as the degree of saturation decreased.
      doi:10.2136/vzj2016.12.0140
      Vadose Zone Journal 2017 16:
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    • Martin Leue, Kai-Uwe Eckhardt, Horst H. Gerke, Ruth H. Ellerbrock and Peter Leinweber
      Spatial Distribution of Organic Matter Compounds at Intact Macropore Surfaces Predicted by DRIFT Spectroscopy
      Core Ideas
      • Clay coatings in Bt horizons are enriched in heterocyclic organic matter compounds.
      • The enrichment results from preferential transport in the soil macropore network.
      • These compounds probably originate from long-term humification and biomass combustion.
      • Py-FIMS and DRIFT spectroscopy approach enables millimeter-scale spatial characterization.
      doi:10.2136/vzj2017.05.0111
      Vadose Zone Journal 2017 16:
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      [ Supplement 1 ]
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