诱导改造对大兴安岭白桦低质林土壤呼吸的影响

摘要

对大兴安岭白桦低质林以不同带宽（6、10、14、18 m）进行皆伐后，种植樟子松进行诱导改造，采用LI-8150多通道土壤碳通量自动测量系统对各诱导改造带以及对照样地的土壤呼吸进行试验分析。结果表明：白桦低质林诱导改造后土壤呼吸的日平均值和日变化幅度均高于对照样地；各诱导改造带的温度敏感指数（ Q10）值在2．25～5．53，总体趋势是随着带宽的增加Q10值升高，但与对照样地（Q10＝5．99）相比，均有不同程度的降低；各诱导改造带土壤呼吸的最适含水率在17．33％～19．11％，均低于对照样地的最适含水率（19．43％），且随着带宽增加，最适含水率降低；土壤呼吸受土壤温度和湿度的共同影响，但土壤温度比土壤湿度更能显著影响土壤呼吸，双因素模型优于仅考虑土壤温度或土壤湿度的单因素模型。%Clear-cutting was executed in white birch low-quality forest of Daxing’an Mountain with different bandwidth (6 m, 10 m, 14 m and 18 m) , the induced transformation was performed by planting Pinus sywestris var.mongovica Litvin, and LI-8150 multi-channel soil carbon flux automatic measuring system was used to test and analysis the induced transformation zone and the check zone.Daily average value and variation range of soil respiration in the induced transformation zone are higher than that in the check zone.Q10 in the induced transformation zone is between 2.25 and 5.53, and the overall trend is: Q10 increases with the increasing of the bandwidth of induced transformation, but they are lower than those in the check zone (5.99) in different degrees.The optimum moisture content of soil respiration in the induction transformation zone is between 17.33%and 19.11%, less than that in the check zone (19.43%).With the increasing of the bandwidth, the optimum moisture content decreases.The soil respiration is influenced by soil temperature and moisture.Compared with the soil moisture, the soil temperature can affect the soil respiration more significantly, and the double factors model are better than either of the single factor model.