关键词: 经营方式, 土壤酶, 氮沉降

Abstract: A field experiment was conducted to investigate the soil physicochemical properties and N₂O emissions from brown soil amended with different materials by static chambergas chromatography method. Three treatments, including single fertilization (CK), fertilization and corn stover incorporation (CS) and fertilization and carbonized corn stover incorporation (BC) were set with the same rate of chemical fertilizer. The results showed that: (1) The N₂O emissions of BC and CS decreased by 38.9% and 24.0% respectively, compared to CK. (2) Compared with CS and CK, the N₂O emission intensity of BC decreased by 35.0% and 39.2% respectively, but no significant difference was observed between CS and CK. (3) Both CS and BC decreased soil bulk density, ammonia oxidation potential, and increased soil pH, available potassium and organic carbon content. (4) Correlation analysis showed that there was a significant positive correlation between N₂O emission and soil temperature, soil bulk density or ammonia oxidation potential. A significant negative correlation was found between N₂O emission and soil pH or nitrate nitrogen concentration. There was also a negative correlation between N₂O emission and soil organic carbon.

Key words: soil enzyme, management type, nitrogen deposition