Journal
ECOLOGICAL ENGINEERING
Volume 93, Issue -, Pages 144-151Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ecoleng.2016.05.030
Keywords
Species richness; Species identity; Ecosystem functioning; Carbon source
Funding
- National Science Foundation of China [31270377, 31170305, 51279121]
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With the aim to develop an approach for treating wastewater with low carbon (C) to nitrogen (N) ratio in constructed wetlands (CWs), we compared the effects of C addition and species diversity on N removal and nitrous oxide (N2O) emissions. Compared with the monocultures without C addition, C addition significantly increased N removal efficiency in monocultures (reached 71% on average); increasing species richness impacted N removal as much as C addition, and the N removal efficiency in the four-species mixture reached 75%. Both C addition and increasing species richness level significantly increased N2O emission rates (reached 1.26 and 1.40 mg m(-2) d(-1), respectively), but had no significant effect on N2O emissions per unit N removal. The effects of species richness on N removal and N2O emissions were stronger than species identity. Compared with C addition, assembling plant communities with high diversity in actual applications could be an effective and more economical approach for treating wastewater with low C/N ratio in CWs. (C) 2016 Published by Elsevier B.V.
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