NDLI: Plant species diversity reduces N$_{2}$O but not CH$_{4}$ emissions from constructed wetlands under high nitrogen levels

Content Provider	Springer Nature Link
Author	Han, Wenjuan Shi, Mengmeng Chang, Jie Ren, Yuan Xu, Ronghua Zhang, Chongbang Ge, Ying
Copyright Year	2017
Abstract	Constructed wetlands (CWs) have been widely used for treating wastewater. CWs also are the sources of greenhouse gas (GHG) due to high pollutant load. It has been reported that plant species diversity can enhance nitrogen (N) removal efficiency in CWs for treating wastewater. However, the influence of plant species diversity on GHG emissions from CWs in habitats with high N levels still lack research. This study established four species richness levels (1, 2, 3, 4) and 15 species compositions by using 75 simulated vertical flow CWs microcosms to investigate the effects of plant species diversity on the GHG emissions and N removal efficiency of CWs with a high N level. Results showed plant species richness reduced nitrous oxide (N$_{2}$O) emission and N (NO$_{3}$ $^{−}$-N, NH$_{4}$ $^{+}$-N, and TIN) concentrations in wastewater, but had no effect on methane (CH$_{4}$) emission. Especially, among the 15 compositions of plant species, the four-species mixture emitted the lowest N$_{2}$O and had under-depletion of N (D$_{min}$TIN < 0). The presence of Oenanthe javanica had a significantly negative effect on the N$_{2}$O emission but had no effect on N removal efficiency. The presence of Rumex japonicus significantly reduced the N (NO$_{3}$ $^{−}$-N and TIN) concentrations in wastewater but had no effect on the N$_{2}$O and CH$_{4}$ emissions. The N concentrations and GHG emissions in the community of R. japonicus × Phalaris arundinacea were as low as those in the four-species mixture. Assembling plant communities with relatively high species richness (four-species mixture) or particular composition (R. japonicus × P. arundinacea) could enhance the N removal efficiency and reduce the GHG emissions from CWs for treating wastewater with a high N level.
Starting Page	5938
Ending Page	5948
Page Count	11
File Format	PDF
ISSN	09441344
Journal	Environmental Science and Pollution Research
Volume Number	24
Issue Number	6
e-ISSN	16147499
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-01-09
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nitrous oxide Methane N removal Species richness Species composition Ecosystem functioning Environment Environmental Chemistry Ecotoxicology Environmental Health Atmospheric Protection/Air Quality Control/Air Pollution Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis Pollution Medicine

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