灰泥土中不同氮肥品种反硝化损失与N_2O排放量的差异

Differences of denitrification losses and N_2O emission from different nitrogen fertilizers in grey soil

在实验室培养条件下,采用土壤培养-乙炔抑制法测定尿素、碳酸氢铵、硫酸铵和氯化铵4种氮肥品种在灰泥土中反硝化损失和N2O排放量的差异.结果表明,氮肥品种间的N2O排放量和反硝化损失量存在极显著差异.尿素、碳铵和氯化铵的N2O排放量极显著高于硫铵,占施肥量的3.88%～4.14%;尿素和碳铵的反硝化损失量分别为施肥量的5.8%和3.7%,极显著高于硫铵和氯化铵;但氯化铵的反硝化损失量显著低于CK.

A soil incubation experiment was conducted under laboratory condition to study the differences of denitrification loss and N2O emission from four nitrogen fertilizers applied to grey soil by the acetylene inhibiton method. The results showed that the deni- trification loss and N2O emission amounts existed significant differences (p<0.01)among four nitrogen fertilizers, the N2O emission amounts from urea, NH4HCO3 and NH4Cl were significantly higher than that from (NH4)2SO4, which accounted for 3.88%~4.14% of nitrogen fertilizer applied. Denitrification loss amounts of urea and NH4HCO3 were significantly higher than that of (NH4)2SO4 and NH4Cl, which accounted for 5.8% and 3.7% of nitrogen fertilizer applied. However, the denitrification loss amount of NH4Cl was significantly lower than that of control treatment.