Contrasting effects of elevated CO₂ on Cu and Cd uptake by different rice varieties grown on contaminated soils with two levels of metals: Implication for phytoextraction and food safety

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• 作者：Zhongyang Li ; Shirong Tang ; Xiaofang Deng ; Ruigang Wang ; Zhengguo Song
• 关键词：Elevated CO₂ ; Rice ; Multi-metal uptake ; Phytoextraction ; Food safety
• 刊名：Journal of Hazardous Materials
• 出版年：2010
• 出版时间：15 May 2010
• 年：2010
• 卷：177
• 期：1-3
• 页码：352-361
• 全文大小：1112 K

文摘

A pot experiment in six open-top chambers with two levels of CO₂ and two multi-metal contaminated soils was conducted to investigate combined effects of elevated CO₂ levels and metals (Cu and Cd) on rice. Elevated CO₂ significantly increased the total dry weight biomass of six Chinese rice by 20–108 and 32–142 % for low and high levels of contaminated soils, respectively. We observed dilution/little varied phenomena in grain Cu concentration in six rice varieties grown on both contaminated soils under elevated CO₂. We found significantly higher Cd concentrations in the parts of three rice varieties under elevated CO₂, but lower levels for the others. Two major conclusions can be drawn from our study: (1) rice varieties with significantly increased biomass and metal uptake under elevated CO₂ exhibit greater potential for phytoextraction and (2) given expected global increases in CO₂ concentration, CO₂-induced accumulation of metals in rice might be a component contributing to the potential health risk in the future, with Cd being a more important threat to human health than Cu.