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| Effects of Elevated CO2 and O3 on Environmental Chemical Properties in a Stimulated Micro-Aquatic Ecosystem |
| Received:April 21, 2014 |
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| KeyWord:elevated CO2;elevated O3;combined effects;aquatic ecosystem |
| Author Name | Affiliation | E-mail | | HU Zheng-xue | State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Nanjing 210023, China | | | YIN Ying | State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Nanjing 210023, China | | | AI Fu-xun | State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Nanjing 210023, China | | | GUO Hong-yan | State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Nanjing 210023, China | hyguo@nju.edu.cn |
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| Abstract: |
| In this study we investigated the responses of chemical properties in aquatic ecosystem to treatments with elevated CO2 and O3 in open top chamber(OTC) for 5 months. The physiochemical parameters of surface water(pH, Eh, soluble Zn, Mg, Fe, TN and TP) and sediments(pH, Eh,and percentages of Zn, Mg and Fe fractions) were measured. Elevated CO2[(600±10)μL·L-1] decreased pH, but increased soluble Zn and Mg concentrations in the surface water. Increasing CO2 had no influence on soluble TP in the surface water. Elevated O3[(125±20)nL·L-1] did not influence pH or concentrations of soluble Zn, Mg and TP in the surface water.Elevation of both CO2 and O3[600±10)μL·L-1 CO2, (125±20)nL·L-1 O3] decreased water pH, whereas increased soluble Mg and TP concentrations significantly. Soluble Zn was not influenced by elevated CO2 and O3 combination. These results indicate that elevated CO2 decreases surface water pH but increases metal concentrations, while elevated O3 has no significant influence on pH or element contents in water. Combination of elevated CO2 and O3 reduces pH and enhances Mg and phosphorus in surface water. Further studies are necessary to investigate the mechanisms under which future atmospheric conditions influence aquatic ecosystem especially under combined CO2 and O3. |
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