Implementing small scale processes at the soil-plant interface – the role of root architectures for calculating root water uptake profiles

Schneider, Christoph; Attinger, Sabine; Delfs, Jens-Olaf; Hildebrandt, Anke

doi:10.5194/hessd-6-4233-2009

Cited by 29 publications

(45 citation statements)

References 32 publications

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“…Gardner's work has been implemented in models with increasing complexity. The last generation of these models is now capable of coupling the microscopic "Gardner" flow to a single root with the water redistribution along the soil profile and the water potential inside the root (Roose and Fowler 2004;Doussan et al 2006;Siqueira et al 2008;Javaux et al 2008;Schneider et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Dynamics of soil water content in the rhizosphere

et al. 2010

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Water flow from soil to plants depends on the properties of the soil next to roots, the rhizosphere. Although several studies showed that the rhizosphere has different properties than the bulk soil, effects of the rhizosphere on root water uptake are commonly neglected. To investigate the rhizosphere's properties we used neutron radiography to image water content distributions in soil samples planted with lupins during drying and subsequent rewetting. During drying, the water content in the rhizosphere was 0.05 larger than in the bulk soil. Immediately after rewetting, the picture reversed and the rhizosphere remained markedly dry. During the following days the water content of the rhizosphere increased and after 60 h it exceeded that of the bulk soil. The rhizosphere's thickness was approximately 1.5 mm. Based on the observed dynamics, we derived the distinct, hysteretic and time-dependent water retention curve of the rhizosphere. Our hypothesis is that the rhizosphere's water retention curve was determined by mucilage exuded by roots. The rhizosphere properties reduce water depletion around roots and weaken the drop of water potential towards roots, therefore favoring water uptake under dry conditions, as demonstrated by means of analytical calculation of water flow to a single root.

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Section: Introductionmentioning

confidence: 99%

Dynamics of soil water content in the rhizosphere

et al. 2010

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“…It found that once a tree is established under slightly unfavorable soil moisture conditions it cannot be outcompeted by smaller trees with better soil moisture uptake capabilities, both in dry as in wet conditions. To investigate water flow within and around a root network, Schneider, et al [50] proposed a standalone root water uptake model to investigate the role of root architecture on the spatial distribution of root water uptake. Model simulations show a redistribution of water uptake from more densely to less densely rooted layers with time.…”

Section: Discussionmentioning

confidence: 99%

Simulation of Water Use Dynamics by Salix Bush in a Semiarid Shallow Groundwater Area of the Chinese Erdos Plateau

Huang

Zhou

Hou

et al. 2015

Water

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Abstract:This study analyzed the water use of the Salix psammophila bush in a semi-arid area in northwest China using a Hydrus-1D model. The model incorporated the effect of thermally driven water flow coupling liquid water, water vapor and heat transport. The model was calibrated and validated using hourly field measurements of soil water content and temperature at different depths for a growing season of 154 days. Furthermore, another Hydrus-1D model was established to simulate environments with decreased heat, rainfall or temperature and an increased leaf area index using calibrated and validated parameters. Our results show that upward and downward thermally driven water vapor fluxes account for 0.11% and 0.28%, respectively, of the corresponding direction of total water flux during the bush's growing season. Although the vapor flux is very small, simulations incorporating heat flow revealed alterations in the temperature and pressure head gradients over the root zone, especially during dry periods. Consequently, the cumulative contributions of groundwater to evapotranspiration (ETg) with heat flow and without heat flow were 26.9% and 40.6%, respectively, during the simulation period. Therefore, the cumulative contribution of groundwater to ETg is overestimated when heat flow is excluded. Thus, we recommended that heat transport be incorporated when evaluating ETg in arid and semi-arid areas.

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“…These days, functional root-soil models at the single plant scale are available and e.g. Doussan et al (2006), Javaux et al (2008), Vrugt et al (2001) or Schneider et al (2010) use such small scale models for water uptake which clearly indicate that water flow in the soil near the root is controlling the uptake behavior of the plant.…”

Section: Introductionmentioning

confidence: 99%

The IWAS-ToolBox: Software coupling for an integrated water resources management

et al. 2011

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Numerical modeling of interacting flow and transport processes between different hydrological compartments, such as the atmosphere/land surface/vegetation/ soil/groundwater systems, is essential for understanding the comprehensive processes, especially if quantity and quality of water resources are in acute danger, like e.g. in semi-arid areas and regions with environmental contaminations. The computational models used for system and scenario analysis in the framework of an integrated water resources management are rapidly developing instruments. In particular, advances in computational mathematics have revolutionized the variety and the nature of the problems that can be addressed by environmental scientists and engineers. It is certainly true that for each hydro-compartment, there exists many excellent simulation codes, but traditionally their development has been isolated within the different disciplines. A new generation of coupled tools based on the profound scientific background is needed for integrated modeling of hydrosystems. The objective of the IWAS-ToolBox is to develop innovative methods to combine and extend existing modeling software to address coupled processes in the hydrosphere, especially for the analysis of hydrological systems in sensitive regions. This involves, e.g. the provision of models for the prediction of water availability, water quality and/or the ecological situation under changing natural and socio-economic boundary conditions such as climate change, land use or population growth in the future.

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Implementing small scale processes at the soil-plant interface – the role of root architectures for calculating root water uptake profiles

Cited by 29 publications

References 32 publications

Dynamics of soil water content in the rhizosphere

Dynamics of soil water content in the rhizosphere

Simulation of Water Use Dynamics by Salix Bush in a Semiarid Shallow Groundwater Area of the Chinese Erdos Plateau

The IWAS-ToolBox: Software coupling for an integrated water resources management

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