Wang Yanhua, Inamori Ryuhei, Kong Hainan, Xu Kaiqin, Inamori Yuhei, Kondo Takashi, Zhang Jixiang
School of Environmental Science and Engineering, Shanghai Jiaotong University, 800 Dong Chuan Road, Min Hang, Shanghai 200240, P.R. China.
Environ Pollut. 2008 Mar;152(2):351-60. doi: 10.1016/j.envpol.2007.06.017. Epub 2007 Jul 25.
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.
土壤-植物系统中的氮素流失引发了环境问题。本研究评估了潜流人工湿地中一氧化二氮（N₂O）的通量。为了更好地理解N₂O排放机制，比较了四种湿地土壤中氨氧化细菌（AOB）的空间分布。N₂O排放数据显示出较大的时空变化，范围为-5.5至32.7 mg N₂O m⁻² d⁻¹。最高的N₂O排放发生在种植芦苇和茭白的单元中。然而，在种植芦苇和香蒲的单元中获得了较低的排放率。这些结果表明茭白刺激了N₂O排放。为AOB生长输送更多的有机物和氧气可能是原因。对AOB的研究也支持了这一结果，表明茭白的根系结构有利于AOB形成N₂O。
