›› 2017, Vol. 29 ›› Issue (1): 119-128.DOI: 10.3969/j.issn.1004-1524.2017.01.17

• Environmental Science • Previous Articles     Next Articles

Research on ammonia emission characteristics and its influencing factors from paddy fields in Taihu Lake region

CHEN Yuan1, FANG Xiaofeng1, 2, SHEN Genxiang2, *, XU Chang2, QIAN Xiaoyong2, ZHAO Zigang3, YU Shaofeng3, LI Jinwen2, WANG Zhenqi2   

  1. 1. College of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237,China;
    2. Shanghai Academy of Environmental Sciences, Shanghai 200233, China;
    3. Shanghai Qingpu Modern Agriculture Park, Shanghai 201717, China
  • Received:2016-07-20 Online:2017-01-15 Published:2017-02-23

Abstract: Ammonia volatilization was monitored via micrometeorological technique in different fertilization periods in paddy fields of Taihu Lake region. Factors influencing ammonia loss, such as N H4+-N concentration, pH in floodwater, N H4+-N concentration in soil, soil temperature, wind speed, were also studied at the same time. The results indicated that ammonia volatilization loss was 28.47% in the period of tillering-top dressing, and was 14.01% in ear bearing-top dressing period after urea application. The ammonia volatilization flux after urea application in varied period decreased as the second period of tillering-top dressing>the first period of tillering-top dressing>ear bearing-top dressing period. Ammonia volatilization lasted 7-11 d. N H4+-N concentration in floodwater was the most important influencing factor in the period of tillering-top dressing, with determination coefficient (R2) of 0.745 4. The important influencing factors in ear bearing-top dressing period included wind speed, N H4+-N concentration in soil and soil temperature, with R2 being 0.965 1, 0.787 5 and 0.896 0, respectively.

Key words: micrometeorological technique, ammonia, volatilization flux

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