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为了研究马衔山多年冻土区和非多年冻土区土壤微生物碳氮、土壤酶活性的差异,选取多年冻土区、季节冻土区和交界区为对象,分析了0~30 cm土层微生物碳氮和转化酶、脲酶、中性磷酸酶、淀粉酶、过氧化氢酶、多酚氧化酶酶活性不同季节的变化特征。结果表明:全氮、总有机碳、微生物量碳氮与多数土壤酶之间呈显著相关关系。在不同区域,土壤微生物碳氮均在0~10 cm含量最高,10~20 cm次之,20~30 cm最低。土壤微生物碳氮在生长季表现为含量逐渐增加,但是多年冻土区与季节冻土区差异不大。土壤酶活性在深度方面表现与微生物碳氮含量变化一致。土壤酶并无的季节变化规律。在多年冻土区,转化酶、多酚氧化酶和磷酸酶活性明显高于非多年冻土区。本研究表明,尽管多年冻土区的植被和土壤总有机碳明显高于非多年冻土区,其土壤微生物碳氮含量相当,且一些土壤酶活性也相当。说明非多年冻土区土壤的生物地球化学相对强度较大。因此,多年冻土退化后可能会导致生态系统的退化。
In order to study the difference of soil microbial biomass C and N and soil enzyme activity in permafrost regions and non-permafrost regions, the permafrost regions, seasonal frozen regions and junctional regions were selected to study the effects of 0-30 cm soil layer Microbial carbon and nitrogen, invertase, urease, neutral phosphatase, amylase, catalase, polyphenol oxidase activities in different seasons. The results showed that there was a significant correlation between total nitrogen, total organic carbon, microbial biomass carbon and nitrogen and most soil enzymes. In different regions, soil microbial carbon and nitrogen were highest in 0 ~ 10 cm, followed by 10 ~ 20 cm and lowest in 20 ~ 30 cm. Soil microbial biomass carbon and nitrogen showed a gradually increasing content in the growing season, but there was no significant difference between the permafrost region and the seasonal frozen soil region. Soil enzyme activity in depth performance and microbial carbon and nitrogen content changes. Seasonal changes in soil enzymes are not. In permafrost regions, invertase, polyphenol oxidase and phosphatase activities were significantly higher than non-permafrost regions. This study shows that although the total organic carbon in vegetation and soil is significantly higher in permafrost regions than in non-permafrost regions, soil microbial C and N contents are comparable, and some soil enzyme activities are comparable. This shows that the soil biogeochemistry in non-permafrost regions is relatively strong. As a result, degradation of permafrost may lead to ecosystem degradation.