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Chinese Journal of Applied Ecology ›› 2003, Vol. ›› Issue (2): 305-309.

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Effect of inorganic nitrogen on CH4 oxidation in soils

WANG Zhiping1, HU Chunsheng2, YANG Jurong 3   

  1. 1. Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;
    2. Institute of Shijiazhuang Agricultural Modernization, Chinese Academy of Sciences, Shijiazhuang 050021, China;
    3. Institute of Environmental Sciences, Beijing Normal University, Beijing 100875, China
  • Received:2001-04-19 Revised:2001-09-07 Online:2003-02-15

Abstract: The effects of N inputs,including N fertilizer applications and atmospheric Ndepositions, on CH4 oxidation by soils were determined by CH4 oxidizing bacteria, N inputs and soil factors. These effects were inhibitory or stimulative, but inhibition was more popular than stimulation, and the inhibition of NH4+ was more popular than that of NO3-. Wealthy experiments in different soils and climate regions are required to monitor and evaluate how N inputs influence CH4 oxidation in soils. Generally, CH4 oxidation in soils following N inputs showed multiple inhibition patterns, i.e., immediate or direct inhibition, delayed inhibition, and absence of inhibition. Some researchers explained the inhibition mechanism through using competition between CH4 and NH4+ for the same enzyme sites, elevated threshold, salt effect and ion exchange, and N turnover rate and N concentration. However, the inhibitory mechanism is still unclear. Therefore, inhibitory mechanism is one of the main research concerns in future.

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