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Assessing thermodynamic parameter sensitivity for simulating temperature responses of soil nitrification.

Hussnain Mukhtar1, Yu-Pin Lin, Chiao-Ming Lin

  • 1Department of Bioenvironmental Systems Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan. yplin@ntu.edu.tw yplin@seas.harvard.edu.

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Understanding soil nitrification temperature sensitivity is key for the nitrogen cycle. This study identifies key thermodynamic parameters in models, improving how we interpret soil biochemical processes and temperature responses.

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Area of Science:

  • Environmental Science
  • Soil Science
  • Biogeochemistry

Background:

  • Soil nitrification is crucial for the global nitrogen cycle.
  • Accurate modeling of temperature sensitivity in soil nitrification is essential.
  • Existing models' thermodynamic parameters require validation for temperature response accuracy.

Purpose of the Study:

  • To identify key thermodynamic parameters influencing soil nitrification potential (NP) temperature response simulations.
  • To assess parameter sensitivity and identifiability across different temperature gradients and models.
  • To enhance the interpretation of thermodynamic parameters in soil biochemical processes.

Main Methods:

  • Global sensitivity analysis was performed on NP temperature response simulations.
  • Two mathematical models (SQRT and MMRT) were applied to sixteen diverse soils.
  • Simulations were conducted across two distinct temperature gradients (4-40 °C and 20-45 °C).

Main Results:

  • Two thermodynamic parameters demonstrated moderate to high sensitivity and unique identifiability across models and temperatures.
  • Parameter sensitivity was influenced by temperature ranges, particularly for the SQRT model.
  • Parameters controlling minimum temperature (Tmin) and response curve curvature (ΔC‡P) showed low sensitivity in SQRT and MMRT models, respectively.

Conclusions:

  • Model parameter sensitivity and temperature range significantly impact the description of soil nitrification temperature sensitivity.
  • A framework is proposed for better interpretation of thermodynamic parameters in temperature-dependent soil processes.
  • Methodological recommendations are provided for future soil temperature sensitivity studies.