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The influence of root water uptake on solute transport is recognized as significant yet remains underexplored in literature. Plants absorb substantial amounts of infiltrating water, affecting soil water flow patterns and solute transport processes. Therefore, experiments are essential to examine the relationship between root water uptake and flow field variability. This PhD project aims to clarify the role of root water uptake on soil moisture distribution and solute transport in two undisturbed soil columns. Over three experimental phases, we investigated soil hydraulic and solute transport characteristics, focusing on the impact of growing barley on water content and tracer movement. Soil water concentration and moisture content were monitored non-invasively using 3-D electrical resistivity tomography (ERT). Additionally, time domain reflectometry (TDR) probes, tensiometers, and temperature probes were employed to measure local soil water contents, matrix potentials, and electrical conductivities. Outflow volume and electrical conductivity of the effluent were also recorded. ERT proved to be an effective technique for monitoring unsaturated zone processes, quantifying solute concentration or soil moisture at the decimeter scale across various soils and conditions. Combined with TDR and effluent measurements, it facilitated the investigation of solute transport and preferential flow. Steady-state step tracer experiments were
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Non-invasive monitoring of water and solute fluxes in a cropped soil, Sarah Garré
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- Pubblicato
- 2010
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