中文摘要：

采用盆栽试验,研究了CO2浓度升高对铜镉不同复合污染水平土壤中5种粳稻吸收N、S、P的影响。结果表明,在铜镉复合污染下,除千重浪2号外,CO2浓度升高总体上使其他品种粳稻的生物量增加。对低复合污染土壤,CO2浓度升高均降低了稻米N质量比,降低幅度为2.66%~14.02%,但对不同品种稻米S、P质量比的影响不同。对高复合污染土壤,CO2浓度升高均降低了稻米中N、S质量比,降低幅度分别为4.71%~10.35%、10.59%~22.84%,但对稻米P质量比的影响不明显。CO2浓度升高对稻米N、S、P总吸收量的影响与稻米干物重和其N、S、P质量比有关。对低复合污染土壤,除千重浪2号外,CO2浓度升高均增加了稻米对N、S的吸收量,增加幅度分别为6.29%~21.88%、21.34%~26.57%;除富禾77外,其他品种稻米对P的吸收量也有所增加,增加幅度为2.12%~45.48%。对高复合污染土壤,CO2浓度升高均降低了稻米N、S吸收量,降低幅度分别为2.99%~17.33%、10.22%~25.70%,而稻米对P的吸收量有升高有降低。

英文摘要：

The paper takes it as a target to make an investigation of elevated C02 concentration on the uptake of N, S and P of rice in copper and cadmium contaminated soils. As is known, the increase of the atmospheric CO2 concentration in the world has become a problem attracting more and more attention. Starting from the urgent nature, we have made an investigation of the effects of elevated CO2 concentration on the uptake of nitrogen （N）, sulfur （S）, and phosphor （P） in the rice fields with the soil contaminated by copper （Cu） and cadmium （Cd）. Our experiments for the said purpose were conducted in a pot-growing form with two CO2 levels, 380 μL/L （ambient） and 760 μL/L （elevated） in six climatrons. The results of our experiments show that there is a noticeable increase of the crop dry matters （DM） under elevated CO2 concentration level except for the variety of rice named ＂Qiangchonglang-2＂ （p 〈 0.05）. As a result, we have found that elevated CO2 concentration had significantly decreased N content in the rice by 2.66%- 14.02% in the low contaminated soil, whereas those of S and P were found different in regard with the rice varieties. At the same time, in the high contaminated soil, the content of N and S in the rice tends to decrease by 4.71% - 10.35%, 10.59%-22.84%, respectively. As compared with the ambient CO2, the impact of elevated CO2 concentration on P content doesn＇t seem obvious in the high contaminated soil. Moreover, in the low contaminated soil, it has been found that, in addition to Qiang- chonglang-2 variety, elevated CO2 concentration also tend to lead to the increase of N and S uptake by 6.29%-21.88% and 21.34%- 26.57%, respectively. Except for the variety of Fuhe-77, the uptake of P has been found increased by 2.12%-45.48% under elevated CO2 concentration in the low contaminated soil, Furthermore, in the high contaminated soil, N and S uptake has been found decreased by 2.99%- 17.33% and 10.22%-25.70%, with the increase of CO2 concentration correspondingly;