title: Seasonal effect on N2O formation in nitrification in constructed wetlands.
abstract: Constructed wetlands are considered to be important sources of nitrous oxide (N(2)O). In order to investigate the contribution of nitrification in N(2)O formation, some environmental factors, plant species and ammonia-oxidizing bacteria (AOB) in active layers have been compared. Vegetation cells indicated remarkable effect of seasons and different plant species on N(2)O emission and AOB amount. Nitrous oxide data showed large temporal and spatial fluctuations ranging 0-52.8 mg N(2)O m(-2)d(-1). Higher AOB amount and N(2)O flux rate were observed in the Zizania latifolia cell, reflecting high potential of global warming. Roles of plants as ecosystem engineers are summarized with rhizosphere oxygen release and organic matter transportation to affect nitrogen transformation. The Phragmites australis cell contributed to keeping high T-N removal performance and lower N(2)O emission. The distribution of AOB also supported this result. Statistical analysis showed several environmental parameters affecting the strength of observed greenhouse gases emission, such as water temperature, water level, TOC, plant species and plant cover.
authors.affiliation: Faculty of Symbiotic Systems Science, Fukushima University, 1 Kanayagawa, Fukushima 960-1296, Japan.
authors.forename: Ryuhei
authors.initials: R
authors.lastname: Inamori
authors.forename: Yanhua
authors.initials: Y
authors.lastname: Wang
authors.forename: Tomoko
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Jixiang
authors.initials: J
authors.lastname: Zhang
authors.forename: Hainan
authors.initials: H
authors.lastname: Kong
authors.forename: Kaiqin
authors.initials: K
authors.lastname: Xu
authors.forename: Yuhei
authors.initials: Y
authors.lastname: Inamori
mesh_terms: D000641:Ammonia / Q000378:metabolism; D001419:Bacteria / Q000378:metabolism; D017753:Ecosystem; D017752:Greenhouse Effect; D017404:In Situ Hybridization, Fluorescence; D009609:Nitrous Oxide / Q000032:analysis* / Q000378:metabolism; D006109:Poaceae / Q000378:metabolism; D012621:Seasons; D012988:Soil Microbiology; D014874:Water Pollutants, Chemical / Q000032:analysis; D053833:Wetlands
chemical_list: D014874:Water Pollutants, Chemical; D000641:Ammonia; D009609:Nitrous Oxide