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Chinese Journal of Applied Ecology ›› 1995, Vol. 6 ›› Issue (4): 378-382.

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CH4 and N2O emission from a rice field and effect of Azolla and fertilitaion on them

Chen Guanxiong1, Huang Guohong1, Huang Bin1, Wu Jie1, Yu Kewei1, Xu Hui1, Xue Xiaohua1, Wang Zhengping2   

  1. 1. Laboratory of Ecological Process of Trace Substance in Terrestrial Ecosystem, Institute of Applied Ecology, Academia Sinica, Shenyang 110015;
    2. Wetland Biogeochemistry Institute, Louisiana State University, Raton Rouge, LA70803, USA
  • Received:1995-02-22 Revised:1995-05-24 Online:1995-10-25 Published:1995-10-25

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Abstract: CH4 and N2O emission from a rice field in northeast China are monitored simultaneously and systematically by using chamber technique to estimate their fluxes from rice fields and to understand the relationship between these two gases emissions.The results show that CH4 emission from rice field in northeast China is much lower than that in south China, with a daily average emission of 0.079·m-2 and total seasonal emission of 7.4g·m-2.Rice fields almost do not emit or deposit N2O during flooding period, but substantially emit it (average flux 59 μgN2O.m-2·h-1) during non-flooding period.CH4 and N2O emissions are greatly enhanced by Azolla and fertilization.Atrade-off between CH4 and N2O emissions is observed, which should be considered when mitigation options for reducing greenhouse gas emission are proposed.

Key words: Rice field CH4 and N2O emission, Azolla, Fertilization, dynamic transfer, CLUE-S model, Taihu Lake basin, landscape spatial pattern, landscape index