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A model and its implications for denitrification in soil environment.

C Lin1, C Chen, W Hsiang

  • 1Department of Soil and Environmental Sciences, National Chung Hsing University, Taichung, Taiwan, ROC.

Proceedings of the National Science Council, Republic of China. Part B, Life Sciences
|August 16, 2000
PubMed
Summary

Soil nitrogen (N) loss is influenced by soil water content and temperature, which are key factors in denitrification. Organic matter decomposition can be slowed by fractional treatment, reducing N loss and denitrification.

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Area of Science:

  • Agricultural Science
  • Environmental Science
  • Soil Science

Background:

  • The Crop-Environment Resources Synthesis (CERES)-maize model simulates crop yield and includes a soil nitrogen (N) sub-model.
  • Understanding N transformations, particularly denitrification, is crucial for managing N losses in agricultural soils and addressing human impacts on the N cycle.

Purpose of the Study:

  • To analyze the mechanisms of the CERES-maize soil N sub-model.
  • To assess the impact of various parameters and organic matter treatments on N transformations, focusing on denitrification.
  • To identify the dominant factors influencing N losses in upland soils.

Main Methods:

  • Calibrated and validated the CERES-maize model in Taiwan.
  • Conducted specific experiments to test the N sub-model's performance against field observations.

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  • Developed computer programs to calculate parameter sensitivity and simulate organic matter treatments.

    • Main Results:

    • Soil water content and temperature were identified as the most dominant factors influencing N transformations, significantly more so than decomposition rates, soil pH, or bulk density.
    • Fractional treatment of organic matter with varying carbon/nitrogen (C/N) ratios slowed decomposition.
    • Fractional organic matter treatment decreased denitrification, except when the organic matter quantity was very large with a high C/N ratio.

    Conclusions:

    • Soil water content and temperature are critical drivers of nitrogen cycling and loss through denitrification.
    • Managing organic matter decomposition through fractional application can mitigate nitrogen losses and reduce denitrification.
    • The CERES-maize N sub-model effectively simulates field observations, providing a tool for understanding and managing soil nitrogen dynamics.