Effect of free-air CO2 enrichment (FACE) on CO2 exchange at the flood-water surface in a rice paddy field

Hiroshi Koizumi*, Takeshi Kibe, Shigeru Mariko, Toshiyuki Ohtsuka, Toshie Nakadai, Wenhong Mo, Hideshige Toda, Nishimura Seiichi, Kazuhiko Kobayashi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


Diurnal and seasonal changes in CO2 exchange between flooding water and the atmosphere are reported in a rice (Oryza sativa) paddy field under ambient and free-air CO2 enrichment (FACE) conditions. Measurements of CO2 exchange were made in a randomized complete-block design experiment with two CO2 mole fractions (ambient; FACE, ambient +200 mmol mol-1) and four blocks. Evolution of CO2 from the flooding water occurred throughout the entire day under ambient CO2, although the rate decreased in the daytime. By contrast, under FACE, CO2 evolution from the flooding water was observed at night, and CO2 absorption from the atmosphere was observed in the daytime. The time course of CO2 exchange was similar to that of solar radiation. The diurnal pattern is similar to that for photosynthesis of terrestrial plant communities. This suggests that photosynthesis of the free-floating weeds and algae in the flooding water is related to the CO2 exchange between the flooding water and the atmosphere. In addition, the amplitude of the diurnal cycle of CO2 exchange was larger under the FACE than under ambient conditions.

Original languageEnglish
Pages (from-to)231-239
Number of pages9
JournalNew Phytologist
Issue number2
Publication statusPublished - 2001
Externally publishedYes


  • CO flux
  • Diurnal change
  • Lemna perpusilla
  • Rice FACE
  • Spirodela polyrhiza
  • Spirogyra sp.

ASJC Scopus subject areas

  • Plant Science
  • General Biochemistry,Genetics and Molecular Biology
  • Biochemistry


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