A coupled carbon, aggregation, and structure turnover (CAST) model for topsoils

  • Stamati F
  • Nikolaidis I
  • Banwart S
 et al. 
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Abstract

In this work, a soil carbon, aggregation, and structure turnover (CAST) model was developed based on the concept suggested by many authors in the scientific literature that macro-aggregates are formed around particulate organic matter, followed by the release of micro-aggregates. A simplified mechanistic Nitrogen model was also developed. The CAST model was evaluated by field data of cropland to set-aside conversions of Critical Zone Observatories in Greece (fine textured Mediterranean) and Iowa (coarse textured humid continental). The model was calibrated successfully to capture the carbon content and the C-to-N ratio content of the pools comprising the three aggregate types (macro-aggregates: >. 250. μm, micro-aggregates: 53-250. μm, silt-clay sized aggregates:

Author-supplied keywords

  • Aggregation
  • C/N sequestration
  • Calibration
  • Particulate OM
  • RothC
  • Structure

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