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Effect of free‐air CO 2 enrichment (FACE) on CO 2 exchange at the flood‐water surface in a rice paddy field
Author(s) -
Koizumi Hiroshi,
Kibe Takeshi,
Mariko Shigeru,
Ohtsuka Toshiyuki,
Nakadai Toshie,
Mo Wenhong,
Toda Hideshige,
Seiichi Nishimura,
Kobayashi Kazuhiko
Publication year - 2001
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1046/j.1469-8137.2001.00104.x
Subject(s) - photosynthesis , atmosphere (unit) , paddy field , environmental science , photosynthetically active radiation , diurnal temperature variation , diurnal cycle , daytime , rice plant , oryza sativa , flooding (psychology) , chemistry , environmental chemistry , atmospheric sciences , agronomy , meteorology , biology , geology , psychology , biochemistry , physics , gene , psychotherapist
Summary• Diurnal and seasonal changes in CO 2 exchange between flooding water and the atmosphere are reported in a rice ( Oryza sativa ) paddy field under ambient and free‐air CO 2 enrichment (FACE) conditions.• Measurements of CO 2 exchange were made in a randomized complete‐block design experiment with two CO 2 mole fractions (ambient; FACE, ambient +200 mmol mol −1 ) and four blocks.• Evolution of CO 2 from the flooding water occurred throughout the entire day under ambient CO 2 , although the rate decreased in the daytime. By contrast, under FACE, CO 2 evolution from the flooding water was observed at night, and CO 2 absorption from the atmosphere was observed in the daytime. The time course of CO 2 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 CO 2 exchange between the flooding water and the atmosphere. In addition, the amplitude of the diurnal cycle of CO 2 exchange was larger under the FACE than under ambient conditions.