Microbial Nitrogen Cycle Hotspots in the Plant-Bed/Ditch System of a Constructed Wetland with N2 O Mitigation

Environmental Science & Technology
Shanyun WangGuibing Zhu

Abstract

Artificial microbial nitrogen (N) cycle hotspots in the plant-bed/ditch system were developed and investigated based on intact core and slurry assays measurement using isotopic tracing technology, quantitative PCR and high-throughput sequencing. By increasing hydraulic retention time and periodically fluctuating water level in heterogeneous riparian zones, hotspots of anammox, nitrification, denitrification, ammonium (NH4+) oxidation, nitrite (NO2-) oxidation, nitrate (NO3-) reduction and DNRA were all stimulated at the interface sediments, with the abundance and activity being about 1-3 orders of magnitude higher than those in nonhotspots. Isotopic pairing experiments revealed that in microbial hotspots, nitrite sources were higher than the sinks, and both NH4+ oxidation (55.8%) and NO3- reduction (44.2%) provided nitrite for anammox, which accounted for 43.0% of N-loss and 44.4% of NH4+ removal in riparian zones but did not involve nitrous oxide (N2O) emission risks. High-throughput analysis identified that bacterial quorum sensing mediated this anammox hotspot with B.fulgida dominating the anammox community, but it was B. anammoxidans and Jettenia sp. that contributed more to anammox activity. In the nonhotspot zones, the NO...Continue Reading

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Citations

Dec 7, 2018·The ISME Journal·Guibing ZhuLorenz Schwark
Oct 9, 2019·The ISME Journal·Shanyun WangChengqing Yin
Mar 8, 2019·International Journal of Environmental Research and Public Health·Yinghai WuRui Han
Aug 24, 2019·The Science of the Total Environment·Shanyun WangGuibing Zhu
Jul 14, 2020·Bioresource Technology·Shuangyu TangGuodong Ji
May 15, 2021·Journal of Environmental Sciences (China)·Hong ZhangJinmiao Zha
Aug 25, 2021·International Journal of Phytoremediation·Ramdas PinnintiPrasada Raju Dandu Radha

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