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Related Experiment Videos

Phosphorus cycling through phosphine in paddy fields.

S H Ha1, Y H Zhuang, J A Liu

  • 1Institute of Animal Hygiene and Veterinary Public Health, University of Leipzig, Germany.

The Science of the Total Environment
|September 28, 2000
PubMed
Summary

Paddy fields release phosphine (PH3) with fluctuating seasonal and daily fluxes, especially during drainage. Most phosphine remains bound in the soil, indicating soil acts as both a source and sink for this gas.

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Area of Science:

  • Environmental Science
  • Soil Science
  • Atmospheric Chemistry

Background:

  • Paddy fields are significant agricultural ecosystems.
  • Phosphine (PH3) is a gas with implications for atmospheric chemistry.
  • Understanding gas emissions from soils is crucial for environmental monitoring.

Purpose of the Study:

  • To quantify phosphine emission fluxes from paddy fields.
  • To measure ambient phosphine levels and soil-bound phosphine.
  • To investigate the seasonal and diurnal dynamics of phosphine in a rice-growing environment.

Main Methods:

  • Field measurements of phosphine emission fluxes throughout the rice growing season.
  • Monitoring of ambient phosphine levels in the air.
  • Analysis of the vertical profile of matrix-bound phosphine in paddy soil.

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Main Results:

  • Significant seasonal and diurnal fluctuations in phosphine emission fluxes and ambient levels were observed.
  • Highest phosphine emission flux occurred during the initial drainage period (approx. 17.7 ng m(-2) h(-1)).
  • The average seasonal phosphine emission flux was approximately 1.78 ng m(-2) h(-1), with most phosphine remaining matrix-bound in the soil.

Conclusions:

  • Paddy soils act as both a source and a sink for phosphine.
  • Phosphine emissions from paddy fields are variable and influenced by soil moisture conditions.
  • The majority of phosphine produced or present in the soil remains in a matrix-bound form, rather than being released into the atmosphere.