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Ammonia volatilization modeling optimization for rice watersheds under climatic differences.

Zhongmin Lian1, Wei Ouyang1, Hongbin Liu2

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The Science of the Total Environment
|February 27, 2021
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Summary
This summary is machine-generated.

Ammonia (NH3) volatilization is complex, varying by watershed. Environmental factors like temperature and soil carbon significantly influence NH3 emissions more than nitrogen input alone.

Keywords:
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Area of Science:

  • Environmental Science
  • Agricultural Science
  • Atmospheric Chemistry

Background:

  • Ammonia (NH3) volatilization is a complex process influenced by diverse watershed conditions.
  • Understanding NH3 emission dynamics is crucial for environmental management and agricultural sustainability.

Purpose of the Study:

  • To develop and validate a watershed NH3 emission dynamics model.
  • To simulate temporal NH3 emission patterns and volatilization dynamics.
  • To investigate the impacts of climatic conditions and soil properties on NH3 emissions.

Main Methods:

  • Integrated field measurements with the Soil Water Assessment Tool (SWAT) and NH3 volatilization algorithms.
  • Developed a watershed NH3 emission dynamics model.
  • Validated the model using data from five monitoring sites and three case watersheds across China.

Main Results:

  • Simulated NH3 emissions varied significantly across watersheds, ranging from 14.94 to 120.33 kg N ha-1.
  • NH3 emissions showed a positive correlation with temperature (r=0.56, p<0.01) and a negative correlation with soil organic carbon (r=-0.33, p<0.01).
  • Significant differences in NH3 volatilization were observed between watersheds (R=0.758-0.834, p<0.01).

Conclusions:

  • Environmental variabilities, including climate and soil properties, play a more critical role in NH3 volatilization than nitrogen input amounts.
  • The developed model effectively simulates NH3 emission dynamics across different watershed conditions.
  • Findings highlight the need for localized management strategies to mitigate NH3 emissions.