Soil Carbon pp 327-335 | Cite as

Clay Addition and Redistribution to Enhance Carbon Sequestration in Soils

  • G. Jock Churchman
  • Andrew Noble
  • Glenn Bailey
  • David Chittleborough
  • Richard Harper
Chapter
Part of the Progress in Soil Science book series (PROSOIL)

Abstract

The association of organic carbon (SOC) with clay in soils means that additions of clay to soils can increase the capacity of the soils for storage, and, eventually, sequestration of C. Addition of a fine-textured waste from bauxite processing to sandy soils for up to 29 years has led to increases of about 12 Mg C ha−1, with a strong (r 2 = 0.93, P < 0.001) correlation between clay content and SOC. An increase of 2.2 Mg C ha−1 has also occurred after 8 years in a sandy topsoil amended with subsoil clay-rich material. Bentonite addition increased plant yield in degraded and light-textured soils in tropical Australia. In Thailand, addition of clay-rich materials, particularly bentonite, but also clayey termite mound material, greatly increased the productivity of a degraded light-textured soil.

Examination of soil modified by redistribution of subsoil clay into sandy topsoil by mechanical inversion showed the growth of roots in incorporated lumps of clay. Electron micrographs of clay-rich soils showed that fine mineral material (clay) can become closely associated with roots and other organic matter, which can protect them from decomposition. Roots within added or redistributed clay, along with microbes and their products, may become coated, enabling carbon sequestration in the long-term.

Keywords

Clay wastes Subsoil clay Plant productivity Roots Sandy soils SOC 

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • G. Jock Churchman
    • 1
  • Andrew Noble
    • 2
  • Glenn Bailey
    • 3
  • David Chittleborough
    • 1
  • Richard Harper
    • 4
  1. 1.School of Agriculture, Food and Wine, and School of Earth and Environmental SciencesUniversity of AdelaideAdelaideAustralia
  2. 2.International Water Management InstituteColomboSri Lanka
  3. 3.BeneTerra Pty LtdToowoombaAustralia
  4. 4.School of Environmental ScienceMurdoch UniversityMurdochAustralia

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