Keywords: 
• environmental science /
• pig slurry /
• nitrous oxide /
• aquic soil /
• environmental impact

Abstract: To determine the characteristics of nitrous oxide （N2O） emissions as well as the relationship between gas emission fluxes and related environmental factors，a pig slurry amendment experiment in an aquic soil was established，and observations of the N2O emissions based on a closed-chamber，gas chromatography-based system in July 2010 （summer） and March 2011 （winter） were made. A field experimental design was employed with three treatments：no（NOF），normal （NF），and excessive fertilization （EF）） and each treatment with three replications. Results showed a highly significant increase （P＜0.001） in N2O emissions from this aquic soil with nitrogen fertilizer application. The N2O emissions ranged from 11.25 to 68.47 gm－2h－1 for NOF，from 20.13 to 244.35 gm－2h－1 for NF，and from 40.09 to 618.43 gm－2h－1 for EF with an exponential relationship between nitrogen application rates and N2O emissions. In addition，soil temperature increases raised N2O emissions. Highly significant exponential relationships （P＜0.001） between N2O emissions and soil moisture，and significant exponential relationships （P＜0.05） between N2O emissions and mass fraction of soil nitrate were also found. When applying the same quantity of N，N2O emissions from the slurry were more than twenty times as much asnitrogen fertilizers such as urea or thiamine. These results indicated that soil temperature，soil moisture and mass fraction of soil nitrate could be important controlling variables for soil N2O fluxes.［Ch，3 fig. 1 tab. 22 ref.］