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Water 2016, 8(1), 24; doi:10.3390/w8010024

Effect of Plant Harvesting on the Performance of Constructed Wetlands during Summer

1
School of Environmental Science and Engineering, Shandong University, Jinan 250100, China
2
College of Geography and Environment, Shandong Normal University, Jinan 250014, China
3
Environment Research Institute, Shandong University, Jinan 250100, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editors: Alan Howard and Defu Xu
Received: 24 November 2015 / Revised: 24 December 2015 / Accepted: 8 January 2016 / Published: 16 January 2016
(This article belongs to the Special Issue Constructed Wetlands Systems and Management)
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Abstract

Plants can remove pollutants through direct absorption and by providing habitats for microbes to stimulate their activities. The aboveground plant biomass is usually harvested to remove pollutants absorbed in plant tissues. However, the effect of plant harvesting during summer on the performance of constructed wetlands and microbial abundance is unclear. In this study, three types of microcosms were set up, including: cleared group (both shoots and roots were harvested), harvested group (only shoots were harvested) and unharvested group. The concentrations of ammonia nitrogen and chemical oxygen demand in the effluent of the harvested group were the lowest. The nitrogen mass balance showed that summer harvesting improved nitrogen absorbance by plants, which was 1.24-times higher than that in the unharvested group. Interestingly, the other losses were taken up by the highest amounts in the cleared group, which were 1.66- and 3.72-times higher than in the unharvested and harvested group, respectively. Quantitative polymerase chain reaction revealed that harvesting of shoots during summer increased the microbial abundance. Additionally, Proteobacteria was the dominant phylum among all bacteria according to pyrosequencing analysis. These results indicate that harvesting of shoots during summer has positive effects on pollutant removal and microbial abundance. View Full-Text
Keywords: harvesting; constructed wetlands; microbial population; structure of the microbial community harvesting; constructed wetlands; microbial population; structure of the microbial community
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yang, Z.; Wang, Q.; Zhang, J.; Xie, H.; Feng, S. Effect of Plant Harvesting on the Performance of Constructed Wetlands during Summer. Water 2016, 8, 24.

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