Elevated Atmospheric CO2 Enhances Copper Uptake in Crops and Pasture Species Grown in Copper-Contaminated Soils in a Micro-Plot Study

Shuai Tian; Yan Jia; Yongzhen Ding; Ruigang Wang; Renwei Feng; Zhengguo Song; Junkang Guo; Li Zhou

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Elevated Atmospheric CO2 Enhances Copper Uptake in Crops and Pasture Species Grown in Copper-Contaminated Soils in a Micro-Plot Study

机译：在微区研究中，大气CO2浓度升高会提高铜污染土壤中种植的农作物和牧场物种的铜吸收量

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The biomass of plants for the purpose of phytoremediation is often small. Carbon dioxide (CO2) can enhance plant biomass and so, it is reasonable to draw such an assumption that CO2 can be used to help plants to phytoremediate heavy metal contaminated soils through enhancing the biomass of remediating plants. To identify this assumption, a micro-plot study in six separate growth chambers was conducted to investigate the effect of high CO2 levels (approximately 1000 ± 50 µL L−1) on Cu accumulation and the remediation potential of three rape varieties and another five crop and pasture species grown in soils contaminated with Cu (485 mg Cu kg−1, denoted as soil-L, and 1200 mg Cu kg−1, denoted as soil-H). The results showed that independently of the CO2 treatment, the shoot biomass and Cu concentration in the eight plants varied with the species and soil Cu levels. The plants grown in soil-L produced a higher aboveground biomass than those grown in the more heavily contaminated soil-H, but the Cu levels were high in all the plants grown in soil-H. Regardless of the CO2 treatment, the shoot biomass and Cu concentration in the plant parts also varied with the species and soil Cu levels. Overall, the exposure of all the plants to elevated CO2 resulted in a biomass increase of 6–136% and a significantly higher remediation capacity. The results indicate that the ever-increasing atmospheric CO2 may enhance the phytoremediation efficiency of Cu contaminated soils; however it also suggests a risk of food safety under the future scenario of elevated atmospheric CO2.

机译：用于植物修复的植物生物量通常很小。二氧化碳（CO2）可以增强植物的生物量，因此可以合理地得出这样一个假设，即CO2可用于通过增强修复植物的生物量来帮助植物修复受重金属污染的土壤。为了确定这一假设，在六个独立的生长室中进行了微样研究，以研究高CO2水平（约1000±50 µL L-1）对Cu积累以及对三个油菜品种和另外五个作物的修复潜力的影响。和在被Cu污染的土壤中生长的草种（485 mg Cu kg-1，表示为L型土壤； 1200 mg Cu kg-1，表示为H型土壤）。结果表明，与CO2处理无关，八种植物的茎生物量和Cu浓度随物种和土壤Cu水平的变化而变化。在土壤L中生长的植物比在污染更严重的土壤H中生长的植物产生更高的地上生物量，但是在土壤H中生长的所有植物中的铜含量都很高。无论采用何种CO2处理，植物部位的枝条生物量和Cu浓度也随物种和土壤Cu水平的变化而变化。总体而言，所有植物暴露于较高的CO2导致生物量增加6–136％，并且修复能力显着提高。结果表明，大气中二氧化碳浓度的不断增加可以提高铜污染土壤的植物修复效率。然而，这也暗示了未来大气中二氧化碳浓度升高的情况下存在食品安全风险。

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来源
《Clean》 |2014年第3期|1-8|共8页
作者
Shuai Tian; Yan Jia; Yongzhen Ding; Ruigang Wang; Renwei Feng; Zhengguo Song; Junkang Guo; Li Zhou;
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作者单位

Agro-Environmental Protection Institute Ministry of Agriculture Tianjin P. R. China;

Key Laboratory of Original Agro-Environmental Quality Ministry of Agriculture Tianjin P. R. China;

College of Great Wall China University of Geosciences Baoding P. R. China;

Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing P. R. China;

Agro-Environmental Protection Institute Ministry of Agriculture Tianjin P. R. China;

Key Laboratory of Original Agro-Environmental Quality Ministry of Agriculture Tianjin P. R. China;

Agro-Environmental Protection Institute Ministry of Agriculture Tianjin P. R. China;

Key Laboratory of Original Agro-Environmental Quality Ministry of Agriculture Tianjin P. R. China;

Agro-Environmental Protection Institute Ministry of Agriculture Tianjin P. R. China;

Agro-Environmental Protection Institute Ministry of Agriculture Tianjin P. R. China;

Agro-Environmental Protection Institute Ministry of Agriculture Tianjin P. R. China;

Agro-Environmental Protection Institute Ministry of Agriculture Tianjin P. R. China;

Agro-Environmental Protection Institute Ministry of Agriculture Tianjin P. R. China;

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正文语种 eng
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关键词
Biomass; Heavy metal contamination; Micro-plot study; Phytoremediation; Plant species;

机译：生物质;重金属污染;微区研究;植物修复;植物种类;

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Elevated Atmospheric CO2 Enhances Copper Uptake in Crops and Pasture Species Grown in Copper-Contaminated Soils in a Micro-Plot Study

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