中文摘要：

为探讨CO2浓度升高对不同品种水稻吸收重金属的影响，利用土培试验研究了2个水平Cu、Cd复合污染条件下6个品种水稻生物量、Cu和Cd吸收量、生物富集系数以及2种水稻根际土Cu和Cd形态变化特征。结果表明，不同品种水稻根、茎、叶、糙米生物量以及Cu、Cd含量之间存在显著差异，各部分Cu、Cd含量顺序为根〉茎〉叶〉糙米。c0：浓度升高显著增加水稻各部分生物量，根、茎、叶、糙米生物量分别平均增加81．6％，59．5％，31．3％，47．7％；6个品种各部位Cu含量不变或者降低，Cd在3个品种各部位的含量增加而在另外3个品种中含量降低，并增加了4个品种对Cd的生物富集系数。CO2浓度升高，增加了根际土中可交换态的Cu、Cd含量，而减少了碳酸盐结合态的Cu、Cd含量。

英文摘要：

A pot experiment was conducted in open top chambers （OTCs） to study the effects of elevated CO2 on the Cu and Cd uptake and rhizosphere Cu, Cd fractions of different rice varieties. The results showed that there were obvious variations of root, stem, leaf and grain biomass and Cu, Cd concentration. The concen- tration order of Cu and Cd in different parts of rice was root 〉stem 〉leaf 〉grain. Elevated CO2 increased the varieties dry biomass significantly, and root, stem, leaf and grain biomass increased by 81.6%, 59.5%, 31.3%, 47.7% on average, respectively. Cu concentrations in the parts of 6 rice varieties did not change or decrease under elevated CO2 treatments, and Cd concentrations increased in 3 rice varieties and decreased in other 3 rice varieties. Elevated CO2 increased Cd bio-accumulation factor of 4 rice varieties. Compare with the ambient COe, elevated CO2 increased exchangeable Cu and Cd amount in rhizospheric soil significantly and decreased Cu and Cd amount bonded to carbonates.