Transpiration in the water-limited regime: soil-plant-atmosphere interactions

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Abstract

The use of vegetation to improve stability of natural and engineered slopes is an engineering Nature Based Solution. One effect of vegetation is to reinforce slopes 'hydrologically', i.e., by generatingsuction by the removal of soil water via transpiration. In turn, the depletion of soil water content reduces the hydraulic conductivity of the shallow layers of the soil, and this hinders rainwater infiltration during the wet period, possibly preserving suction in the deeper layers susceptible to failure. To improve upon thisstabilising technique, it is key to develop transpiration models that account for the hydraulic characteristics of the soil and plant (below- and above-ground). In this way, modelling can guide the choice of the plant functional traits. This paper first discusses the conceptual and experimental limitations of common empirical evapotranspiration reduction functions (e.g. Feddes function) and then revisits the physically-based 'bottlenecks'generating the decline in evapotranspiration in the water-limited regime within the framework of the Soil-Plant-Atmosphere Continuum.

Original languageEnglish
Article number13001
Number of pages12
JournalE3S Web of Conferences
Volume382
DOIs
Publication statusPublished - 24 Apr 2023
Event8th International Conference on Unsaturated Soils, UNSAT 2023 - Milos, Greece
Duration: 2 May 20235 May 2023

Keywords

  • vegetation mapping
  • transpiration
  • soil-plant-atmosphere continuum

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