To fractionate the contribution of plant to N2O emission from soil-plant system,the N2O emissions from soybean,soil and soil-plant system were measured by closed chamber method under field condition.

• 为区分植物在土壤-植物系统N2O排放中的贡献,用封闭式箱法对田间栽培的大豆植株及土壤、大豆植株-土壤系统的N2O排放进行了测定,同时对影响N2O的排放的因素进行了分析。