【摘要】 N₂O是受人类活动影响的温室气体，土壤中硝化和反硝化作用是N₂O产生的主要过程，施用生物质炭影响土壤氮素矿化过程和N₂O排放。本研究以广州近郊菜地土壤为研究对象，在施氮肥和不施氮肥情况下，分别施加3%和6%的稻壳炭（RB）、棕榈丝炭（PB）,进行室内培养试验，研究不同生物质炭和施入量对酸性菜地土壤氮素矿化和N₂O排放的影响。研究结果表明，施氮处理菜地土壤氮素矿化量和土壤N₂O累积排放量最大，分别达到153.6 mg/kg和383.7μg/kg,添加生物质炭显著降低了菜地土壤氮素矿化量和土壤N₂O排放量（P<0.05）,生物质抑制了菜地土壤氮素矿化过程，降低了土壤中硝态氮和铵态氮含量，从而抑制了土壤N₂O的形成和排放，抑制程度随生物质炭添加量增加而增强，不同类型生物质炭作用不同，稻壳炭（RB）抑制作用大于棕榈丝炭（PB）。更多还原

【Abstract】 N₂O is a greenhouse gas affected by human activities. Nitrification and denitrification in the soil are the main processes of N₂O emission. The application of biochar affects the soil nitrogen mineralization process and N₂O emission.To study the effects of biochar on nitrogen mineralization and N₂O emission, the acid vegetable soil in the suburbs of Guangzhou province was adopted for incubation experiment, and rice husk biochar（RB） and palm silk carbon（PB） were applied at 3% and 6% respectively with and without nitrogen fertilizer. The results showed that the amout of nitrogen mineralization and N₂O emission in nitrogen fertilizer treatment were the largest, reaching 153.6 mg/kg and 383.7 μg/kg, respectively. The addition of biochar significantly reduced the soil nitrogen mineralization and soil N₂O emissions（P<0.05）. Biochar inhibited the nitrogen mineralization process and reduced the content of nitrate nitrogen and ammonium nitrogen in the soil, and thus suppressed the formation and emission of N₂O in the soil. The inhibition degree increased with the increase of biochar addition. Different kind of biochar had different effects, and the inhibition degree of rice biochar（RB） was greater than that of palm silk biochar（PB）.更多还原