An elevated atmospheric CO 2 concentration ([ CO 2 ]) can reduce stomatal conductance of leaves for most plant species, including rice ( O ryza sativa L.). However, few studies have quantified seasonal changes in the effects of elevated [ CO 2 ] on canopy evapotranspiration, which integrates the response of stomatal conductance of individual leaves with other responses, such as leaf area expansion, changes in leaf surface temp...

The projected increase of atmospheric CO 2 concentration ([CO 2 ]) is expected to increase rice yield, but little is known of the effects of [CO 2 ] at low temperature, which is the major constraint to growing rice in cool climates. We grew rice under two levels of [CO 2 ] (ambient and elevated by 200 μmol mol −1 ) and two nitrogen (N) fertilization regimes in northern Japan in 2003 (cool weather) and 2004 (warm weather) in th...

Methane (CH 4 ) is a particularly potent greenhouse gas with a radiative forcing 23 times that of CO 2 on a per mass basis. Flooded rice paddies are a major source of CH 4 emissions to the Earth's atmosphere. A free‐air CO 2 enrichment (FACE) experiment was conducted to evaluate changes in crop productivity and the crop ecosystem under enriched CO 2 conditions during three rice growth seasons from 1998 to 2000 in a rice paddy...

Over time, the stimulative effect of elevated CO 2 on the photosynthesis of rice crops is likely to be reduced with increasing duration of CO 2 exposure, but the resultant effects on crop productivity remain unclear. To investigate seasonal changes in the effect of elevated CO 2 on the growth of rice ( Oryza sativa L.) crops, a free air CO 2 enrichment (FACE) experiment was conducted at Shizukuishi, Iwate, Japan in 1998–2000....