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| Atmospheric ozone stress improving biological availability of Cd in soil during the rice season |
| Received:March 01, 2017 |
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| KeyWord:OTCs;elevated O3 concentration;cadmium;rice season;biological availability |
| Author Name | Affiliation | E-mail | | WANG Ya-bo | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | | | WEI Si-yu | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | | | SUN Yue | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | | | DANG Ting-ting | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | | | YIN Wei-qin | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | | | WANG Sheng-sen | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | | | WANG Xiao-zhi | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | xzwang@yzu.edu.cn |
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| Abstract: |
| The objective of this study was to determine the changes in the bioavailability of Cd in soil exposed to elevated atmospheric O3 during the rice season. Open-top chambers(OTCs) were used to set up normal atmospheric conditions and an elevated atmospheric O3 condition(elevated 40 nmol·mol-1 more than normal atmospheric conditions). We added 0 mg·kg-1,5 mg·kg-1, and 50 mg·kg-1 extrinsic Cd to soil to study the dynamic changes of Cd in the soil while the rice was growing. The changes in plant biomass and Cd content in different plant organs at the maturity period were recorded. Soil samples were collected at 0~5 cm, 5~10 cm, and 10~15 cm depths of topsoil at tillering, jointing, heading, and maturity stages. The bioavailability of soil Cd was evaluated by the Community Bureau of Reference(BCR) sequential extraction and the DTPA extraction. The results showed that ozone fumigation significantly reduced the grain yield of rice in the treatment of non-polluted soil, with a decrease of 2.92%. However, Cd content tended to increase in plant organs from contaminated soil-20.20%(moderately polluted soil) and 6.67%(heavily polluted soil), respectively. Ozone fumigation aggravated the activation of residual Cd in rice growth, and the vegetative growth period. Ozone fumigation demonstrated a negative effect on the growth of rice, while the presence of Cd pollution did more harm to the crops, which may increase the risk of Cd biological enrichment into the food chain. |
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