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中文摘要：
在FACE（free-aircarbon dioxide enrichment）实验平台上，采用水培的方法观测了抽穗期水稻根系的生长情况。结果表明，FACE条件下根生物量、根体积和根冠比极显著增加且不定根明显增多、变粗。高CO2浓度显著降低了根中N含量，而C含量变化不明显，导致碳氮比极显著增加。基于单位根质量的根系活力在CO2浓度增加条件下极显著降低，养分吸收效率的降低可能是根中N含量下降的重要原因。
英文摘要：
Rice root growth was examined by using hydroponics in a FACE（free air carbon dioxide enrichment）study. Root biomass, root volume, ratio of root/shoot, number of adventitious roots and root diameter were all increased significantly under FACE conditions. CO2 enrichment decreased the N content in the rice root, but did not change the C content, leading to an obvious increase in the ratio of C/N. Elevated CO2 decreased the rice root activity remarkably. Decrement in nutrient uptake efficiency may be the mechanism of decreased N content in root.
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