Microbial biomass and enzymatic activity of forest soils in the Raifa area of the Volzhsko-Kamsky reserve
DOI:
https://doi.org/10.24852/2411-7374.2023.2.49.56Keywords:
the soil, microbial biomass, invertase; catalase, microbial carbon reservesAbstract
The article presents the results of determining the reserves of microbial carbon, the share of microbial carbon in the total soil carbon, the activity of catalase and invertase enzymes in forest soils of different ages and species composition. The objects of study were soddy-podzolic soils of six sample plots established in 2022 on the territory of the Raifa area of the Volzhsko-Kamsky state natural biosphere reserve. The soils under pine forests, birch forests, linden forests belonging to two age groups were studied: “middle-aged” and “overmature”. It has been established that the average content of microbial carbon in the humic soil horizons ranges from 0.44 to 1.24 mgC/g, decreasing with depth. The share of microbial carbon in the total soil organic carbon, on the contrary, increases with depth. In the humus horizons, it was 2.5–4.4%; in the illuvial horizons it reaches 14–70%. The reserves of microbial carbon in the 0–30 cm layer range from 1.33 to 2.69 tC/ha. The lowest values of carbon content of microbial biomass, invertase and catalase activity were observed in soils under pine forests. In soils under deciduous forests, these figures are higher. A high correlation was shown between the amount of microbial biomass in soils and invertase enzyme activity (r 0.87), catalase activity and humus content (0.73), catalase and invertase activity (0.79). An average correlation was noted between the content of microbial carbon and humus in the upper soil horizons (r 0.53), invertase activity and humus content (0.48), catalase activity and microbial carbon content (0.60).
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