Keywords: 
• soil science /
• biogas engineering /
• biogas slurry /
• greenhouse gas /
• emission flux

Abstract: To determine the effects of biogas slurry application on greenhouse gas emissions （GGE），including CO2，CH4，and N2O，in agricultural soil，a closed-chamber，gas chromatography-based system were used in July 2010 （summer） and March 2011 （winter）. Three treatments with 3 replications were carried out：no （ck），normal （9.45 gm－2 in summer，and 0.65 gm－2 in winter），and heavy （28.36 gm－2 in summer，and 1.94 gm－2 in winter） biogas slurry applications. Two-way ANOVA analysis was used to test the significance. Results showed （1） no significant differences in CO2 emissions among treatments. （2）For CH4 emissions in summer within the first 8 h of biogas slurry application, the heavy application treatment was significantly greater （P＜0.001) than the other two treatments with a maximum emission flux of 3.98 mgm-2h-1 in the heavy, 1.25 mgm-2h-1 in the normal，and 0.28 mgm－2h－1 in ck；however，after 8 h there were no significant differences. （3） N2O emissions in summer within the first 20 h after biogas slurry application, revealed significant differences （P＜0.001） with a maximum emission flux of 1 641 gm－2h－1 in the heavy application treatment；after 20 h，significant differences （P＜0.05） between the treatments continued with the N2O emission fluxes of 224－349 gm－2h－1 for heavy，70－137 gm－2h－1 for normal，and 33.81－57.06 gm－2h－1 for ck. No significant differences in N2O emissions were found between the treatments in winter. These results could provide helpful information for environmental risk assessments with biogas slurry application, especially with effects on GGE. ［Ch，3 fig. 19 ref.］