An infiltration column to investigate experimentally the response of the soil-plant-atmosphere continuum

R. Dainese, A. Belli, T. Fourcaud, A. Tarantino

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Abstract

This paper presents an experimental setup to study the SPAC (Soil-Plant-Atmosphere Continuum) and the mechanisms of water extraction by vegetation. The infiltration column was equipped with TDR probes and High-Capacity Tensiometers to monitor the profiles of volumetric water content and suction respectively. A balance was used to monitor the evaporation/evapotranspiration rate. Experiments were run in parallel on a bare sample and a soil sample vegetated with grass respectively. Two different evaporation/evapotranspiration regimes were imposed by considering natural and forced ventilation. The experimental setup was able to cap-ture the transition from the energy-limited to the water–limited regime. The profiles of water content and suc-tion recorded by TDR probes and the high-capacity tensiometers where coherent with the different stages in the evapotranspiration process. The response of the TDR probes has also been successfully validated by com-parison with measurements of water content by oven-drying.
Original languageEnglish
Number of pages6
Publication statusPublished - 3 Aug 2018
Event7th International Conference on Unsaturated Soils - HKUST, Hong Kong, China
Duration: 3 Aug 20185 Aug 2018
http://www.unsat2018.org/

Conference

Conference7th International Conference on Unsaturated Soils
Abbreviated titleUNSAT2018
CountryChina
CityHong Kong
Period3/08/185/08/18
Internet address

Keywords

  • infiltration column
  • unsaturated soil
  • soil-plant-atmosphere continuum
  • soil atmosphere interaction
  • evapo transpiration

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