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Chinese Journal of Applied Ecology ›› 2005, Vol. 16 ›› Issue (1): 100-104.

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Effects of N application and maize growth on N2O emission from soil

YANG Lanfang1,2, CAI Zucong 1   

  1. 1. Key State Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;
    2. College of Resource and Environment, Hubei University, Wuhan 430062, China
  • Received:2003-11-28 Revised:2004-03-15 Online:2005-01-15 Published:2005-01-15

Abstract: With pot experiment and using static chamber-GC technique,this paper studied the effects of N application(150 and 300 mg穔g-1 soil)and maize growth on N2O emission from soil.In maize-planted soil,the N2O emission rate increased with increasing N application rate,its peak appeared at seedling stage,and there was no significant correlation between N2O emission and air temperature.Contrarily,in bare soil,the peak of N2O emission rate occurred at the anaphase of the experiment,and there was a significant exponential correlation between N2O emission and air temperature.The total amount of N2O emission increased remarkably with increasing N application rate in both planted and bare soils.In comparing with bare soil,maize-planting reduced N2O emission by 92% and 87%,respectively at high and low N application rates,which suggested that maize-planting not only affected the seasonal variation and magnitude of N2O emission from soil,but also altered the relationship between air temperature and soil N2O emission.

Key words: Maize growth, N2O emission from soil, N application, Temperature

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