植物地上部分对大气CO2浓度升高的响应

大气CO2浓度升高对植物的影响，主要是促进了植物生长早期的光合作用，同时也增加了对其他资源的需求；植物的光合作用也存在对高CO2浓度的适应，不会一直维持较高的光合水平，而且植物的呼吸作用也可能会增加；大气CO2浓度升高和其他环境条件，如水分，温度和光照等对植物生长和产量存在相互作用，可以部分弥补条件的不足，也影响作物和杂草的竞争关系；自然植物群落由于有很高的多样性和复杂性，对其研究应该在生物群落水平上进行，用外推法回到植物水平，而不是相反，而且自然物种间的竞争是激烈的，CO2浓度升高或其他因素带来的任何改善，都会明显地改变竞争平衡。

Study on response of vegetable aboveground to the elevated atmospheric CO2

This paper summaries the current researches about the effects of the elevated CO2 on vegetable above-ground. Elevated CO2 mainly increased the photosynthesis of plant at early growing stage and increased the need of plant for other source like nutrients. Plant photosynthesis can acclimate to the elevated CO2 and not keep a higher rate throughout the whole season. The plant respiration may be increased by the elevated CO2. There are reciprocity effect of elevated CO2 and other environment, such as water, temperature and light, and so forth on plant growth, and the elevated CO2 can partly make up the shortage of environmental condition and the competitive relation between plant and weed. Because natural plant community has great diversity and complexity, the study about the effect of elevated CO2 should be on level of community and then used on plant level by extrapolating, not reverse. The competition between the natural species is furious, any improve made by the elevated CO2 or other factors can significantly change the competitive balance.