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Related Experiment Videos

[Rice-wheat rotational FACE platform. I. System structure and control].

Gang Liu1, Yong Han, Jianguo Zhu

  • 1Institute of Soil Science, Chinese Academy of Science, Nanjing 210008. gliu@issas.ac.cn

Ying Yong Sheng Tai Xue Bao = the Journal of Applied Ecology
|February 1, 2003
PubMed
Summary
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A novel Free Air CO2 Enrichment (FACE) system precisely controls elevated CO2 levels for crops like rice and wheat. This advanced system ensures uniform CO2 distribution, crucial for climate change research.

Area of Science:

  • Agricultural Science
  • Environmental Science
  • Atmospheric Chemistry

Context:

  • Rising atmospheric CO2 concentrations impact global agriculture.
  • Controlled environment studies are vital for understanding crop responses to elevated CO2.
  • Free Air CO2 Enrichment (FACE) systems offer a method for in-situ experimentation.

Purpose:

  • To establish and evaluate a Free Air CO2 Enrichment (FACE) system for a rice and winter wheat rotation.
  • To precisely control elevated CO2 concentrations (200 µmol·mol⁻¹ above ambient) using a dynamic computer-controlled system.
  • To assess the uniformity of CO2 distribution within FACE rings under varying environmental conditions.

Summary:

  • A computer-controlled FACE system was developed for rice and winter wheat, maintaining CO2 levels 200 µmol·mol⁻¹ above ambient.

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  • Control precision is influenced by wind speed, crop/soil respiration, and diffuse layer thickness.
  • Post-adjustment, 83% daytime and 68% nighttime control precision were achieved, with uniform CO2 distribution (557 mol·mol⁻¹ daytime, 608 mol·mol⁻¹ nighttime) and high Target Achievement Ratios (TAR) of 1.03-1.09 during the 2001 rice season.

    • Impact:

    • Provides a reliable platform for studying crop physiological and yield responses to future atmospheric CO2 levels.
    • Contributes to refining FACE technology for more accurate climate change impact assessments on agriculture.
    • Enhances understanding of CO2 uptake dynamics and distribution in agricultural ecosystems.