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以小兴安岭落叶林沼泽湿地为研究对象,对比研究皆伐地、火烧地和落叶松湿地土壤碳组分和酶活性.结果表明:(1)3种湿地类型土壤SOC含量表现为对照地显著高于皆伐地和火烧地(p<0.05),在0~10 cm土层中皆伐地与对照地相比降低了58.38%,火烧地与对照地相比降低了61.96%.皆伐地与火烧地在不同土层的土壤中SOC含量差异不显著(p>0.05);DOC含量对照地显著高于皆伐地和火烧地(p<0.05).在0~10cm土层中火烧地DOC含量是皆伐地的1.99倍,两者差异不显著(p>0.05);不同干扰方式对土壤MBC含量影响的差异主要表现在0~10 cm的土层土壤,对照地分别比皆伐地和火烧地高23.13%和95.79%(p<0.05).在不同的土层中皆伐地MBC含量均大于火烧地,与SOC含量的变化趋势一致.(2)与对照地相比,皆伐地与火烧地0~10 cm土层的土壤蔗糖酶活性分别降低了45.59%和36.76%,脲酶活性显著降低了18.22%和55.69%(p<0.05),蛋白酶活性降低了19.65%和17.34%,淀粉酶活性降低了6.29%和10.69%.土壤碳组分和酶活性在垂直方向上均表现为随着土层深度增加而减小.皆伐和火烧造成森林湿地土壤碳组分和酶活性降低.
Taking Xiaoxing’anling deciduous forest wetland as the research object, the soil carbon content and enzyme activity in clear-cut, fire-burned and larch wetlands were compared.The results showed that: (1) SOC content of three wetland types was significantly higher than that of the control In the 0-10 cm soil layer, the clear-cutting area was reduced by 58.38% compared with the control ground and the burning area was reduced by 61.96% compared with the control ground. (P> 0.05). The content of DOC in control soil was significantly higher than those in clear-cut and fire-exposed areas (p <0.05). The content of DOC in the 0 ~ 10cm soil layer was And the difference was not significant (p> 0.05). The differences of soil MBC content affected by different disturbance modes were mainly in 0 ~ 10 cm soil layer, which were higher than that of clear-cut land and fire ground (23.13%) and 95.79% (p <0.05) .In different soil layers, the content of MBC in clear-cut land was higher than that of burned land, which was consistent with the trend of SOC content. (2) Compared with the control land, The soil invertase activity decreased by 45.59% and 36.76%, while the urease activity decreased by 18.22% and 55.69% (p <0.05), and the protease activity decreased by 0-10 cm 19.65% and 17.34% lower, and the amylase activities decreased by 6.29% and 10.69%, respectively. The vertical distribution of soil carbon content and enzyme activity decreased with soil depth increasing. Soil carbon components and enzyme activity decreased.