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Soil Pore Network Complexity Changes Induced by Wetting and Drying Cycles-A Study Using X-ray Microtomography and 3D

Jocenei A T de Oliveira1, Fábio A M Cássaro1, Adolfo N D Posadas2

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Area of Science:

  • Soil Science
  • Agronomy
  • Earth Science

Background:

  • Soils are dynamic systems altered by management and environmental factors.
  • Wetting and drying (W-D) cycles are common in agricultural soils and impact pore structure complexity.
  • Understanding these impacts is crucial for soil health and sustainable agriculture.

Purpose of the Study:

  • To investigate the effects of successive wetting and drying cycles on Oxisol pore network architecture.
  • To compare these effects across different soil management systems: conventional tillage (CT), minimum tillage (MT), no tillage (NT), and secondary forest (F).

Main Methods:

  • Utilized a 3D multifractal approach to analyze soil pore architecture.
  • Incorporated lacunarity, Shannon's entropy, and pore geometric parameters for quantitative assessment.
  • Evaluated soil samples from Oxisols under four contrasting management systems.

Main Results:

  • The 3D multifractal analysis effectively quantified W-D cycle-induced changes in soil pore architecture.
  • Lacunarity curves highlighted significant modifications, particularly in F, NT, and MT systems.
  • Pore connectivity and tortuosity were notably affected in F and NT soils.
  • 3D geometric parameters and normalized Shannon's entropy proved complementary for analysis.

Conclusions:

  • W-D cycles significantly alter soil pore complexity, with management practices influencing the extent of these changes.
  • Soil management systems could be broadly categorized into two groups based on pore architecture similarity: (F and NT) and (CT and MT).
  • The study provides a comprehensive understanding of how soil management and W-D cycles interact to shape soil pore structure.