Plant diversity decreases net global warming potential integrating multiple functions in microcosms of constructed wetlands. (20th May 2018)

• Record Type: Journal Article
• Authors: Du, Yuanyuan; Pan, Kaixuan; Yu, Chenchen; Luo, Bin; Gu, Weili; Sun, Hongying; Min, Yong; Liu, Dong; Geng, Yan; Han, Wenjuan; Chang, Scott X.; Liu, Yang; Li, Dan; Ge, Ying; Chang, Jie
• Is Part Of: Journal of cleaner production. Volume 184(2018)
• Page Start: 718
• Page End: 726
• Publication Date: 2018-05-20
• Subjects: Greenhouse gases -- Plant species richness -- Plant species identity -- Carbon sequestration -- Carbon dioxide emission mitigation -- Biofuel production; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2018.02.273
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Constructed wetlands, which are designed ecosystems that consist of substrates, plants and microorganisms, have been used as an alternative clean technology to treat wastewater. However, greenhouse gas emission in constructed wetlands is still an accompanying problem. Finding a cleaner way to mitigate the net global warming potential while maintaining nitrogen removal efficiency has received increasing attention in recent years. High plant diversity has been found to increase nitrogen removal efficiency, but its effect on net global warming potential is not well understood. In this study, four species richness levels (1, 2, 3 and 4) were assembled in microcosms simulating constructed wetlands. The goal of this work is to explore the effects of plant diversity (species richness and identity) on the net global warming potential integrating multiple functions, including carbon sequestration in substrate, carbon dioxide emission mitigation by aboveground biomass converted to biofuel, and non-carbon dioxide (methane and nitrous oxide) emissions. Results showed that: (1) increasing species richness reduced the global warming potential based on carbon sequestration and carbon dioxide emission mitigation while increasing the global warming potential of non-carbon dioxide emissions of the microcosms; (2) increasing species richness mitigated the overall global warming potential due to the greater role of carbon sequestration and carbon dioxide emission mitigation; and (3) the presence of Rumex japonicus or Oenanthe javanica decreased the overall global warming potential of the microcosms. This study concluded that assembling communities with high plant species richness and several specific species instead of monocultures are more effective and cleaner for mitigating global warming potential while maintaining the efficiency of nitrogen removal. Highlights: Increasing plant species richness (SR) increased methane and nitrous oxide emissions. SR reduced global warming potential (GWP) integrating substrate and biomass carbon. SR reduced net GWP integrating methane, nitrous oxide, substrate and biomass carbon. Presence of Rumex japonicus or Oenanthe javanica in microcosms reduced the net GWP. Assembling high SR and high performance species resulted cleaner wastewater treatment.