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Article

Effects of Elevated Atmospheric CO2 Concentration on Phragmites australis and Wastewater Treatment Efficiency in Constructed Wetlands

1
Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan 250100, China
2
Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
3
College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
4
Department of Plant Physiology, Slovak Agricultural University, 94976 Nitra, Slovakia
5
Department of Botany and Plant Physiology, Czech University of Life Sciences Prague, Kamycka 129, 16500 Prague, Czech Republic
*
Author to whom correspondence should be addressed.
Equally contributed as first authors.
Academic Editor: Zhongbing Chen
Water 2021, 13(18), 2500; https://doi.org/10.3390/w13182500
Received: 30 July 2021 / Revised: 8 September 2021 / Accepted: 9 September 2021 / Published: 12 September 2021
(This article belongs to the Special Issue Pollutants Removal from Wastewater Using Constructed Wetlands)
Elevated atmospheric CO2 concentration (e[CO2]) has been predicted to rise to more than 400 ppm by the end of this century. It has received extensive attention with regard to the pros and cons of e[CO2] effects in terrestrial and marine ecosystems, while the effects of e[CO2] on wastewater treatment efficiency in constructed wetlands (CWs) are rarely known. In this study, the atmospheric CO2 concentration was set as 400 ppm (that is, ambient [CO2]) and 800 ppm (that is, e[CO2]). The physiological performance of Phragmites australis and microbial enzyme activities in constructed wetlands in response to e[CO2] were tested. Significantly higher net photosynthetic rate and plant growth were found under e[CO2]. The concentrations of nitrate, total anions, and total ions in the xylem sap of Phragmites australis were reduced, while the uptake of N and P in plants were not affected under e[CO2] condition. In addition, the ammonia monooxygenase activity was reduced, while the phosphatase activity was enhanced by e[CO2]. The increased removal efficiency of chemical oxygen demand and total nitrogen in CWs could be ascribed to the changes in physiological performance of Phragmites australis and activities of microbial enzymes under e[CO2]. These results suggested that the future atmospheric CO2 concentration could affect the wastewater treatment efficiency in CWs, due to the direct effects on plants and microorganisms. View Full-Text
Keywords: constructed wetlands; CO2 elevation; plant physiology; carbohydrate metabolism; microbial activity constructed wetlands; CO2 elevation; plant physiology; carbohydrate metabolism; microbial activity
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MDPI and ACS Style

Wang, Z.; Li, S.; Liu, S.; Wang, F.; Kong, L.; Li, X.; Brestic, M. Effects of Elevated Atmospheric CO2 Concentration on Phragmites australis and Wastewater Treatment Efficiency in Constructed Wetlands. Water 2021, 13, 2500. https://doi.org/10.3390/w13182500

AMA Style

Wang Z, Li S, Liu S, Wang F, Kong L, Li X, Brestic M. Effects of Elevated Atmospheric CO2 Concentration on Phragmites australis and Wastewater Treatment Efficiency in Constructed Wetlands. Water. 2021; 13(18):2500. https://doi.org/10.3390/w13182500

Chicago/Turabian Style

Wang, Zongshuai, Shuxin Li, Shengqun Liu, Fahong Wang, Lingan Kong, Xiangnan Li, and Marian Brestic. 2021. "Effects of Elevated Atmospheric CO2 Concentration on Phragmites australis and Wastewater Treatment Efficiency in Constructed Wetlands" Water 13, no. 18: 2500. https://doi.org/10.3390/w13182500

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