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Related Concept Videos

Pore Size Distribution01:23

Pore Size Distribution

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In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
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Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
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The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
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Updated: Apr 15, 2026

A Simple Protocol for Mapping the Plant Root System Architecture Traits
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Coarse and fine root plants affect pore size distributions differently.

G Bodner1, D Leitner2, H-P Kaul1

  • 1Department of Crop Sciences, Division of Agronomy, University of Natural Resources and Life Sciences, Konrad-Lorenz-Strasse 24, 3430 Tulln, Austria.

Plant and Soil
|April 3, 2015
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Summary

Plant roots significantly impact soil structure and pore dynamics at the field scale. Different root systems alter soil properties, influencing water movement and soil management strategies.

Keywords:
Conceptual modelCover cropsPore evolutionPore size distributionRoot systemSoil structure

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Area of Science:

  • Soil Science
  • Plant Ecology
  • Hydrology

Background:

  • Root-pore interactions at the micro-scale are crucial but their field-scale hydraulic impacts require validation.
  • Understanding how root traits influence macroscopic soil pore parameters is essential for bridging knowledge gaps.

Purpose of the Study:

  • To develop a framework linking root effects on pore parameters to rhizosphere-scale knowledge.
  • To investigate the impact of root systems on soil pore size distribution and dynamics at the field scale.

Main Methods:

  • Field experiment with twelve plant species.
  • Pore size distribution (PSD) modeling using Kosugi's model and tension infiltrometer data.
  • Regression analysis relating root traits to pore variables and pore evolution modeling.

Main Results:

  • Rooting density above 0.5% of pore space stabilized soil structure.
  • Coarse roots increased macroporosity by 30%; dense fine roots led to pore space heterogenization and increased micropore volume.
  • Particle re-orientation and aggregate coalescence were suggested as key processes; pore evolution models partially explained observed dynamics.

Conclusions:

  • Distinct root system morphologies induce specific pore dynamics.
  • Effective hydraulic impacts of root systems necessitate scaling from root-pore interfaces for plant-based soil management.