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为研究凋落物对CO2,N2O排放和CH4吸收的影响,从2002年9月3日到2003年10月30日,采用静态密闭箱技术对长白山阔叶红松林两种类型土壤生态系统的CO2,N2O和CH4的通量进行测定。两种土壤类型分别为表层有凋落物覆盖和没有凋落物覆盖。研究结果表明,凋落物对CO2,N2O和CH4通量有显著性影响(P<0.05)。有凋落物样地的CO2,N2O和CH4通量的日变化趋势和无凋落物样地中三种气体的日变化趋势相似,且CO2,N2O和CH4的日通量峰值都出现在18:00。有凋落物样地的CO2,N2O和CH4通量的季节变化趋势和无凋落物样地中三种气体的季节变化趋势也相似,但在一年之中,CO2和CH4的峰值出现在六月,N2O的峰值却出现在八月。研究结果还表明有凋落物样地CO2,N2O的日排放通量和年均排放通量明显大于无凋落物样地中两种气体的排放通量,但有凋落物样地的CH4日吸收通量和年均排放通量却小于无凋落物样地的CH4吸收通量。
In order to study the effects of litter on CO2, N2O emission and CH4 absorption, from September 3, 2002 to October 30, 2003, the static closed box technology was used to study the effects of litter on the CO2, N2O and CH4 flux were measured. The two soil types were covered with litter and without litter, respectively. The results showed that litter had a significant effect on the fluxes of CO2, N2O and CH4 (P <0.05). The diurnal variation trend of fluxes of CO2, N2O and CH4 in the litter plot were similar to those of the three gases in the non-litter plots. The diurnal flux of CO2, N2O and CH4 peaked at 18:00 . The seasonal trends of fluxes of CO2, N2O and CH4 in the litter plot were also similar to those of the three gases in the non-litter plot, but in one year, the peaks of CO2 and CH4 appeared in June However, the peak of N2O appeared in August. The results also showed that the daily flux and the average annual flux of CO2 and N2O in litter plot were significantly higher than those in the non-litter plot, but the daily catch-up of CH4 in litter plot But less than the CH4 flux in litter-free plots.