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- W2300679770 abstract "The flow of water from soil to plant roots is affected by the narrow region of soil close to the roots, the so-called rhizosphere. The rhizosphere is influenced by mucilage, a polymeric gel exuded by roots that alters the hydraulic properties of the rhizosphere. When in contact with water mucilage can hold large volumes of water but when dry it turns hydrophobic.Here we focus on the effect of mucilage on soil hydaulic properties. At first we present experimental and numerical studies describing the rewetting dynamics of dry rhizosphere. Below a certain concentration of mucilage water could flow across the rhizosphere layer, above this concentration the layer turned water repellent. We present an analytical estimation of mucilage concentration at percolation threshold as function of mean soil particle size and bulk soil water potential after irrigation. The estimation was validated with capillary rise experiments.We developed an effective model describing how mucilage alters soil hydraulic functions, namely (a) swelling and shrinking dynamics of mucilage result in non-equilibrium dynamics between water potential and water content, (b) the presence of mucilage in gel reduces the water potential at a given water content and (c) mucilage is viscous and reduces the soil hydraulic conductivity at a given water content.In experiments on soil-mucilage mixtures we tested the model and we applied it to simulate observations of past experiments with real plants that show evidences of altered hydraulic dynamics in the rhizosphere.Attached to this thesis are two studies on heat dissipation from underground electrical power cables. Here hydraulic dynamics similar to those of water flow towards a single root can occur." @default.
- W2300679770 created "2016-06-24" @default.
- W2300679770 creator A5084726307 @default.
- W2300679770 date "2016-03-10" @default.
- W2300679770 modified "2023-09-26" @default.
- W2300679770 title "Water dynamics in the rhizosphere" @default.
- W2300679770 hasPublicationYear "2016" @default.
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