典型双季稻田基施碳酸氢铵和尿素的氨挥发损失研究

采用密闭室连续抽气法研究了湖南典型双季稻田,尿素和碳酸氢铵基施后的氨挥发特征。结果表明,基施碳酸氢铵(NC)稻田初始氨挥发强度和氨挥发总量大于基施尿素(UR)稻田。早稻季NC处理稻田氨挥发排放量为45.19 kg·hm-2,损失率达30.12%,UR处理氨挥发排放量为32.93 kg·hm-2,损失率达21.95%;晚稻季NC处理稻田氨挥发排放量为70.91 kg·hm-2,损失率达31.93%,UR处理氨挥发排放量为61.78 kg·hm-2,损失率达27.04%。基施尿素能够显著降低稻田氨挥发排放,减少氮素损失。

Ammonia volatilization loss from typical double cropping paddy field with basal application of ammonium bicarbonate and urea

A closed continuous airflow method was used to study on dynamic changes of NH3 volatilization in treatments with ammonium bicarbonate(NC) and urea(UR) in typical double cropping paddy field in Hunan Province.The results showed that,1) both of the initial NH3 volatilization intensity and total NH3 volatilization quantity from NC treatment were higher than those of the UR treatment.2) in early rice field,NH3 volatilization quantity of the NC treatment was 45.19 kg·hm 2,accounting for 30.12% of N application amount; and that of the UR treatment was 32.93 kg·hm 2,accounting for 21.95% of N application amount; but in late rice field,NH3 volatilization emissions of the NC treatment was 70.91 kg·hm 2,the loss rate was 31.93%; and that of the UR treatment was 61.78 kg·hm 2,and the loss rate was 27.04%. 3) urea as basal dressing could significantly reduce emissions of NH3 volatilization,and decreased the N losses.