Effect of soil organic carbon on soil water retention

Reports about the relationship between soil water retention and organic carbon content are contradictory. We hypothesized that this relationship is affected by both proportions of textural components and amount of organic carbon

W.J. Rawls

2003

Scholarcy highlights

  • Reports about the relationship between soil water retention and organic carbon content are contradictory. We hypothesized that this relationship is affected by both proportions of textural components and amount of organic carbon
  • Sand and silt along with organic carbon content and taxonomic order resulted in 25% improvement in accuracy over using textural classes
  • At low organic carbon contents, the sensitivity of the water retention to changes in organic matter content was highest in sandy soils
  • Increase in organic matter content led to increase of water retention in sandy soils, and to a decrease in fine-textured soils
  • At high organic carbon values, all soils showed an increase in water retention
  • Results are expressed as equations that can be used to evaluate effect of the carbon sequestration and management practices on soil hydraulic properties

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