Effects of plant diversity on greenhouse gas emissions in microcosms simulating vertical constructed wetlands with high ammonium loading

论文摘要

Wastewater with relatively high nitrogen concentrations is a major source of nitrous oxide（N2O） and methane（CH4） emissions and exerts multiple stresses on the environment.Studies have shown that plant diversity plays an important role in ecosystem functioning.However, the effects of plant species diversity on CH4 and N2O emissions under high ammonium（NH4+-N） loading rates remain unclear. In this study, a microcosm experiment simulating vertical constructed wetlands supplied with high NH4+-N water levels was established. The treatments included four species richness levels（1, 2, 3, 4） and 15 species compositions. There was no significant relationship between species richness and N2O emissions. However, N2O emissions were significantly reduced by specific plant species composition. Notably, the communities with the presence of Rumex japonicus L. reduced N2O emissions by 62% compared to communities without this species. This reduction in N2O emissions may have been a result of decreased N concentrations and increased plant biomass. CH4 emissions did not respond to plant species richness or species identity.Overall, plant species identity surpassed species richness in lowering N2O emissions from constructed wetlands with high NH4+-N water. The results also suggest that communities with R. japonicus could achieve higher N removal and lower greenhouse gas emissions than other wetland species.

论文目录

• Introduction
• 1. Material and methods
•   1.1. Experimental design
•   1.2. Sampling methods
•   1.3. Statistical analysis
• 2. Results
•   2.1. Nitrous oxide and methane emissions in response to species richness and identity
•   2.2. Nitrogen concentrations in effluent and N accumulations in substrate in response to species richness and identity
•   2.3. Plant biomass production in response to species richness and identity
•   2.4. Greenhouse gas emissions in response to N concentrations in effluent and N accumulations in substrate and plant biomass
• 3. Discussion
•   3.1. Effects of species identity
•   3.2. Effects of species richness
•   3.3. Relative contribution of species richness and species identity
•   3.4. Approach for enhancing N removal and reducing green-house gas emissions
• 4. Conclusions

文章来源

类型: 期刊论文

作者: Wenjuan Han,Guiying Luo,Bin Luo,Chenchen Yu,Hai Wang,Jie Chang,Ying Ge

来源: Journal of Environmental Sciences 2019年03期

年度: 2019

分类: 工程科技Ⅰ辑

专业: 环境科学与资源利用

单位: College of Life Sciences, Zhejiang University,College of Chemistry and Life Sciences, Zhejiang Normal University,College of Life Sciences, Shaoxing University

基金: supported by the National Natural Science Foundation of China(Nos.31670329,31470463,31500321,31770434)

分类号: X173;X70

页码: 229-237

总页数: 9

文件大小: 1026K

下载量: 83