【摘要】 应用乙炔抑制原状土柱培育法测定了4种施肥处理的玉米地N素反硝化损失速率和氧化亚氮（N₂O）排放通量,并分析了它们与土壤湿度、土壤温度以及硝态氮（NO₃^--N）含量之间的关系,计算了因反硝化和N₂O排放造成的N肥损失率。结果表明,玉米生育期内土壤N素的反硝化损失量为0.67～3.85kg/hm²,N肥的反硝化损失率为0.5％～1.5％;土壤N₂O排放总量为0.55～1.42kg/hm²,N肥的N₂O排放系数为0.2％～0.5％。更多还原

【Abstract】 Denitrification rates and N2O fluxes are measured by using the acetylene inhibition method on intact soil cores in different N-fertilized maize plots. The relationships among denitrification rate and N2O flux with soil moisture, soil temperature and NO2--N concentration in soil are analyzed,and losses of N-fertilizer caused by denitrification and N2O emission are calculated. The results show that denitrification loss from soil is 0.67-3.85kg/hm2 during the growing period of maize,percentage of denitrification loss from N-fertilizer is 0.5%-1.5% ,the total N2O e-mission is 0.55-1.42kg/hm2,and N2O emission coefficient of N-fertilizer is 0.2%-0.5%.更多还原