地膜覆盖对土壤中N_2O排放通量的影响

Effects of clear plastic film mulch on the change of soil N_2O discharge flux.

田间试验研究了西北干旱半干旱地区地膜覆盖对土壤中N2O排放通量变化的影响.结果表明,在小麦生长期内,地膜覆盖措施使N2O排放通量在扬花期最高,成熟期最低;N2O排放通量的增加幅度在小麦分蘖期最高,扬花期最低.在土壤剖面上,随着土壤深度的增加,5,10,20cm土层处N2O排放通量依次递增;地膜覆盖措施使N2O排放通量的增加幅度在10cm土层处为最高.地膜覆盖使土壤中N2O排放通量增加.

Field experiments was used to study the change of soil N2O discharge flux in the northwestern arid and semi-arid areas. Results showed: in the wheat growing stages, the measure of clear plastic film mulch made the flux highest in the flowering stage and lowest in the mature stage, the flux highest in the tillering stage and lowest in the flowering stage; the flux of N2O in the upper soil layers with depths of 5, 10 and 20cm increased in the order of depth, the measure of clear plastic film mulch made the flux highest in the 10cm soil layer; and the increase of the flux by the clear plastic film mulch.