Abstract—

The dynamics of the content and properties of water-soluble organic matter and the biological activity of soils of dwarf-shrub heath and graminoid meadow of alpine tundra on slopes of different aspects are estimated. The variation of most of the studied parameters during the growing season is revealed, which confirms the importance of dynamic observations in assessing the role of soils in changing environment. Soils on the southwestern slope are characterized by higher mean daily temperatures and lower water contents throughout the entire growing season. Despite this, slope aspect does not affect the content of water-soluble organic matter and the potential respiratory activity of soil microorganisms. At the same time, under warmer and drier conditions, the organic matter of alpine tundra soils is less resistant to microbiological transformation. The natural gradient of soil temperature and moisture does not significantly affect the efficiency of using carbon sources and the overall functioning of microbial communities. Based on the data obtained, it is predicted that the adaptation of the soil microbial community to a gradual rise in temperatures in the Subarctic region should proceed without a sharp increase in the rate of mineralization of soil organic matter by microorganisms.

中文翻译：

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克比伯尼山坡坡地苔原土壤生物活性和水溶性有机物的动态

摘要-

估算了不同坡度上高山寒带矮化灌木丛和粒状草甸土壤水溶性有机质含量和性质的动态以及土壤生物活性。揭示了大多数研究参数在生长期的变化，这证实了动态观测对于评估土壤在不断变化的环境中的作用的重要性。西南坡的土壤在整个生长季节的平均日温度较高，而含水量较低。尽管如此，坡度不会影响水溶性有机物的含量和土壤微生物的潜在呼吸活性。同时，在温暖干燥的条件下，高山冻原土壤的有机质对微生物转化的抵抗力较弱。土壤温度和湿度的自然梯度不会显着影响碳源的使用效率和微生物群落的整体功能。根据获得的数据，可以预测，亚微生物区域土壤微生物群落对温度逐渐升高的适应应在不使微生物使土壤有机物矿化速率急剧增加的情况下进行。