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大气ＣＯ２浓度升高对植物光合作用的影响研究多集中在单叶水平，在高ＣＯ２及高温下对植物单叶及群体光合进行比较的研究少有报道，而群体水平的研究则是预测生态系统反应所不可缺少的。采用田间开顶式培养室研究了大气ＣＯ２浓度和温度升高对水稻（ＯｒｙｚａｓａｔｉｖａＬ．）叶片及群体光合作用的影响。发现ＣＯ２浓度和温度对水稻叶片光合作用有协同促进作用，而对群体光合作用的促进则随时间的推移而减弱；单叶光合受到的促进作用大于群体光合；叶面积指数只在营养生长期受到促进，冠层叶片含氮量受ＣＯ２影响降低。群体呼吸（包括茎杆）增加及冠层叶片早衰可能是后期ＣＯ２对群体光合促进作用下降的原因。
The studies on the effects of elevated atmospheric CO2 on plant photosynthesis are mostly concentrated at single leaf level. There are few reports on the photosynthesis of single leaf and population under high CO2 and high temperature, while the study on population level is based on the prediction of ecosystem The reaction is indispensable. The effect of atmospheric CO2 concentration and temperature on the photosynthesis of rice (Oryzasativa L.) leaves and their populations was studied using a field open top chamber. It was found that CO2 concentration and temperature had a synergistic effect on photosynthesis of rice leaves, while the promotion of photosynthesis decreased with the passage of time. The promoting effect of single leaf photosynthesis was larger than that of population photosynthesis. The leaf area index was only affected during vegetative growth Promote, canopy leaf nitrogen content reduced by the impact of CO2. Population respiration (including stems) increased and canopy leaf premature senescence may be the reason for the decrease of CO2 photosynthesis in the late stage.