Elevated CO2 Levels Affects the Concentrations of Copper and Cadmium in Crops Grown in Soil Contaminated with Heavy Metals under Fully Open-Air Field Conditions

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• 作者：Hongyan Guo ; Jianguo Zhu ; Hui Zhou ; Yuanyuan Sun ; Ying Yin ; Daping Pei ; Rong Ji ; Jichun Wu ; Xiaorong Wang
• 刊名：Environmental Science & Technology
• 出版年：2011
• 出版时间：August 15, 2011
• 年：2011
• 卷：45
• 期：16
• 页码：6997-7003
• 全文大小：864K
• 年卷期：v.45,no.16(August 15, 2011)
• ISSN：1520-5851

文摘

Elevated CO₂ levels and the increase in heavy metals in soils through pollution are serious problems worldwide. Whether elevated CO₂ levels will affect plants grown in heavy-metal-polluted soil and thereby influence food quality and safety is not clear. Using a free-air CO₂ enrichment (FACE) system, we investigated the impacts of elevated atmospheric CO₂ on the concentrations of copper (Cu) or cadmium (Cd) in rice and wheat grown in soil with different concentrations of the metals in the soil. In the two-year study, elevated CO₂ levels led to lower Cu concentrations and higher Cd concentrations in shoots and grain of both rice and wheat grown in the respective contaminated soil. Elevated CO₂ levels slightly but significantly lowered the pH of the soil and led to changes in Cu and Cd fractionation in the soil. Our study indicates that elevated CO₂ alters the distribution of contaminant elements in soil and plants, thereby probably affecting food quality and safety.