Nitrous oxide emission from polyculture constructed wetlands: effect of plant species.
Loss of nitrogen from the soil-plant system has raised environmental concern. This study assessed the fluxes of nitrous oxide (N2O) in the subsurface flow constructed wetlands (CWs). To better understand the mechanism of N2O emission, spatial distribution of ammonia-oxidizing bacteria (AOB) in four kinds of wetlands soil were compared. N2O emission data showed large temporal and spatial variation ranging from -5.5 to 32.7 mg N2O m(-2) d(-1). The highest N2O emission occurred in the cell planted with Phragmites australis and Zizania latifolia. Whereas, the lower emission rate were obtained in the cell planted with P. australis and Typha latifolia. These revealed that Z. latifolia stimulated the N2O emission. Transportation of more organic matter and oxygen for AOB growth may be the reason. The study of AOB also supported this result, indicating that the root structure of Z. latifolia was favored by AOB for N2O formation.
Wang
Yanhua
Y
School of Environmental Science and Engineering, Shanghai Jiaotong University, 800 Dong Chuan Road, Min Hang, Shanghai 200240, P.R. China.
Inamori
Ryuhei
R
Kong
Hainan
H
Xu
Kaiqin
K
Inamori
Yuhei
Y
Kondo
Takashi
T
Zhang
Jixiang
J
D000393:Air Pollutants / Q000032:analysis*; D000641:Ammonia / Q000378:metabolism; D001419:Bacteria / Q000378:metabolism; D001673:Biodegradation, Environmental; D017752:Greenhouse Effect; D017404:In Situ Hybridization, Fluorescence; D009609:Nitrous Oxide / Q000032:analysis*; D010084:Oxidation-Reduction; D010944:Plants / Q000378:metabolism*; D006109:Poaceae / Q000378:metabolism; D012988:Soil Microbiology; D032401:Typhaceae / Q000378:metabolism; D014865:Waste Disposal, Fluid / Q000379:methods*; D014872:Water Movements; D018508:Water Purification; D053833:Wetlands
D000393:Air Pollutants; D000641:Ammonia; D009609:Nitrous Oxide