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本文采用熏蒸法和土壤酶活性测定法,研究了内蒙古大兴安岭不同火烧迹地土壤微生物生物量碳氮和酶活性的变化特征。结果表明:与对照(未过火的)相比,火烧后不同年份的火烧迹地土壤微生物生物量碳氮、土壤脲酶活性和土壤蔗糖酶活性均极显著下降。除了土壤脲酶活性外,轻重度火烧迹地2003年显著或极显著高于2008年和2012年。随着火烧后恢复年限的增长,土壤微生物生物量碳氮、土壤脲酶活性和土壤蔗糖酶活性均有所提高,经过大约10a的恢复,可达到了未过火对照组水平,相比之下土壤过氧化氢酶活性恢复的较快。该结果揭示了大兴安岭火烧迹地恢复过程中土壤质量状况的动态变化,为森林生态系统的科学管理和森林更新提供了理论依据。
In this paper, fumigation and soil enzyme activity determination method was used to study the characteristics of soil microbial biomass C, N and enzyme activities in different burned areas of Daxinganling, Inner Mongolia. The results showed that soil microbial biomass C and N, soil urease activity and soil invertase activity were significantly decreased in different years after fire compared with the control (not over-heated). In addition to soil urease activity, light and heavy burned areas were significantly or extremely significantly higher in 2003 than in 2008 and 2012. With the increase of years after fire, soil microbial biomass C and N, soil urease activity and soil invertase activity all increased. After about 10 years of recovery, the level of non-over-fire control group was reached, compared with the soil over Catalase activity recovered faster. The results revealed the dynamic changes of soil quality during the restoration of fire burned sites in Daxinganling, which provided a theoretical basis for the scientific management and forest regeneration of forest ecosystems.