Abstract: Using Chinese FACE (Free Air gas Concentration Enrichment) facility, we conducted a field experiment to investigate the impacts of ambient air (Ambient), elevated \[CO₂\] (EC, Ambient+200 μmol·mol^-1), elevated temperature (ET, Ambient+2 ℃) and elevated \[CO₂\]+elevated temperature (EC+ET) on growth and development of a super rice cultivar ⅡY084. The results showed that the heading and maturity stage arrived 1-3 days later in EC and EC+ET treatments than in Ambient, but no response was detected in ET treatment. Compared with Ambient, EC and EC+ET treatments significantly increased the final dry weight per stem by 49% and 40%, respectively, but ET treatment showed the opposite tendency. On average, leaf, stem and sheath, panicle and aboveground biomass at maturity increased under EC by 40% (P<0.01), 69% (P<0.01), 30% (P<0.01), and 39% (P<0.01), but decreased under ET by 11% (P<0.05), 21% (P=0.14), 31% (P<0.01) and 26% (P<0.01), respectively. The respective increase due to EC+ET treatment was 40% (P<0.05), 47% (P<0.05), 10% (P=0.33) and 18% (P<0.05), respectively. In general, aboveground biomass and its components at heading and 20 days after heading showed a similar pattern, with the magnitude of responses being less than those at maturity. In contrast to biomass production, less effect of CO₂ or temperature treatment was found on dry matter allocation in plants. EC and EC+ET treatments significantly increased the concentration and content of nonstructural carbohydrates (NSC) in stem and sheath at the maturity stage, but ET showed the opposite trend. The above results indicated that, as for super rice ⅡY084, the combination of elevated CO₂ concentration and temperature in the near future would result in increases in the concentration and content of NSC in stem and sheath, total biomass production and its components at harvest time, but the magnitudes of the increases are less than those by elevated CO₂ concentration alone.

Key words: microplate fluorimetric assay, soil quality, redundancy analysis, soil enzyme activity