Impact of wetting-drying cycles on the hydro-mechanical behaviour of vegetated soil

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Abstract

Climate change strongly affects the hydro-mechanical properties of soil. Due to drought and heavy rains the soil is subjected to severe hydro-mechanical loads, that, in turn, alter the microstructure of the soil. The most affected area is the so-called vadose zone, the layer of soil situated between the ground surface and the water table. Here the presence of vegetation has a strong impact, related to the elongation/expansion of the root architecture and the hydro-mechanical interactions with soil. Additionally, the presence of plant roots facilitate the evapotranspiration process from deeper soil layers. The research presents an experimental investigation, aimed to reproduce the typical hydro-mechanical conditions as found in the vadose zone in controlled laboratory conditions. Drying-wetting cycles are induced in soils samples, where maize plants are free to sprout and develop as well as in reference non-vegetated samples. The water content and distribution within the soil matrix are studied through 4D (3D+time) in-vivo x-ray computed tomography and effects on the soil-root microstructure are quantified with 3D image analysis. Those are correlated with above ground measurements such as fluorescence (through a spectroradiometer) that, in turn, provides leaf water potential, and the stomatal conductance that controls the evapotranspiration.
Original languageEnglish
Number of pages1
DOIs
Publication statusPublished - 28 Mar 2022
EventEGU General Assembly 2022 - Vienna, Austria
Duration: 23 May 202227 May 2022

Conference

ConferenceEGU General Assembly 2022
Abbreviated titleEGU 2022
Country/TerritoryAustria
CityVienna
Period23/05/2227/05/22

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