Rhizosphere Dynamics and Soil Hydrological Properties

The rhizosphere is the narrow zone of soil surrounding living roots, where intense physical, chemical and biological interactions govern water retention, flow and uptake. Root growth and associated exudation of mucilage and other organic compounds modify pore geometry, wettability and matric potential gradients at the micro-scale. These modifications influence capillary rise, hydraulic conductivity and hysteresis in soil water release and imbibition. Microbial activity further mediates aggregation and bioclogging, altering transport pathways for water and solutes. Advanced imaging and modelling techniques have revealed that rhizosphere structure is highly localised—often at micrometre scales—and dynamically evolves with root age, soil texture and moisture regimes. Understanding these processes is critical for optimising plant water use efficiency, improving drought resilience in crops and managing soil carbon and nutrient cycles under changing climatic conditions.

Research from Nature Portfolio

Recent work using high-resolution X-ray computed tomography has shown that root penetration does not simply compact soil at the interface but instead increases porosity in a highly localised zone around the root. This emergent rhizosphere pore structure, at micrometre resolution, contrasts with earlier assumptions of densification and has profound implications for water and solute transport. It demonstrates that root growth can create preferential pathways for rewetting and gas exchange, thereby reshaping local hydraulic properties in ways that support efficient water uptake and nutrient acquisition.

Rhizosphere Dynamics and Soil Hydrological Properties publication trend

The graph below shows the total number of articles in rhizosphere dynamics and soil hydrological properties across all publications each year (not limited to Nature Index journals).

Technical terms

Rhizosphere: The soil region immediately surrounding roots, influenced by root exudates and microbial activity.

Mucilage: Gel-like polysaccharide secretion from roots that modifies soil wettability and pore structure.

Porosity: The fraction of soil volume occupied by pores, controlling storage and movement of water and air.

Wettability: The tendency of a solid surface to be wetted by water, often quantified by the contact angle.

Matric potential: The energy status of water in soil, driving capillary movement and retention.

Hysteresis: The difference in soil water retention during drying versus wetting cycles, reflecting structural and chemical soil changes.

References

1. Variations in pore size and contact angle distributions control rhizosphere rewetting. Geoderma (2023).
2. The emergent rhizosphere: imaging the development of the porous architecture at the root-soil interface. Scientific Reports (2017).
3. Surface tension, rheology and hydrophobicity of rhizodeposits and seed mucilage influence soil water retention and hysteresis. Plant and Soil (2019).
4. Assessing the influence of the rhizosphere on soil hydraulic properties using X-ray computed tomography and numerical modelling. Journal of Experimental Botany (2015).