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[B-12.3 Experimental Studies on the Effects of Global Warming on Plants]

[Contact Person]

Hideyuki Shimizu
Senior Researcher
Environmental Biology Division,
National Institute for Environmental Studies
Environment Agency
16-2 Onogawa, Tsukuba, Ibaraki 305, Japan
Phone +81-298-50-2451 , Fax +81-298-51-0471
E-mail: hshimizu@nies.go.jp

[Total Budget for FY1993-FY1995]

8,441,000 Yen (FY1995; 2,936,000 Yen)

[Abstract]

　The effects of "global warming"(carbon dioxide(CO₂) concentration, air temperature and/or relative humidity) on the transpiration and growth of crops(C₃ and C₄ plants) were investigated using the environment-controlled growth cabinets. The growths of dry weight and leaf area were accelerated by an increase in CO₂ concentration but were reduced by an increase in air temperature or a decrease in air humidity. These environmental factors modified the several growth parameters and the transpiration rates. The water use efficiency was increased by an increase in CO₂ concentration but decreased by an increase in air temperature or a decrease in air humidity. The relative humidity and CO₂ concentration or air temperature functioned independently in many cases, while the interaction between these factors was significant in some cases. The effects of high temperature(36.5-39.5C) on the fertility of rice plants were also studied. Then, the impacts of "global warming" on rice yield in Japan simulated under 2 x CO₂(640ppm) climate scenarios were predicted.

[Key Words]

Carbon dioxide, Global warming, Growth, Humidity, Temperature