Тип публикации: статья из журнала
Год издания: 2026
Идентификатор DOI: 10.1134/S1064229325605207
Ключевые слова: arctic, extreme ecosystems, microbial biomass, gene copy number, Culturable microorganisms, cryosols
Аннотация: The reserves and structure of microbial biomass, the number of cultivated micromycetes and bacteria, and the abundance of copies of ribosomal genes of microorganisms in gleyic cryozems and cryoturbated permafrost gleysols (Cryosols) in the vicinity of the village of Dikson were studied. Microbial biomass ranged from 0.0194 to 0.3743 mg/g soil. Fungi predominated in the microbial biomass (62.3 to 98.8%). Fungal biomass ranged from 0.019 to 0.350 mg/g soil, and mycelial length ranged from 8.86 to 435.14 m/g soil. Prokaryotic biomass ranged from 0.0005 to 0.0296 mg/g soil, and abundance ranged from 2.03 × 107 to 1.19 × 109 cells/g soil. The mycelial length of actinomycetes ranged from 0.2 to 15.2 m/g soil. The number of ribosomal genes copies of microorganisms decreased with depth along the soil profiles and ranged: from 4.34 × 107 to 1.49 × 109 gene copies/g of soil for 16S rRNA of archaea; from 8.40 × 108 to 2.31 × 1010 gene copies/g of soil for 16S rRNA of bacteria; and from 7.60 × 105 to 1.00 × 109 gene copies/g of soil for ITS rRNA of fungi. The number of cultivated micromycetes in cultures incubated at +25°C varied from 1.1 × 103 to 9.8 × 103 CFU/g of soil, and at +5°C from 4.7 × 102 to 6.5 × 103 CFU/g of soil. Saprotrophic genera (<i>Penicillium</i>) and genera typical of cold ecosystems (<i>Chrysosporium</i>, <i>Goffeauzyma</i>, <i>Pseudogymnoascus</i>, and <i>Thelebolus</i>) dominated in number and abundance. A decrease was revealed in the number of CFU and taxonomic diversity of microscopic fungi from surface to deeper horizons, regardless of the incubation temperature of cultures. The abundance of culturable saprotrophic bacteria ranged from 229.44 × 103 to 928.66 × 103 CFU/g of soil, with no clear quantitative dependence on the soil profile horizon location. Representatives of the genera <i>Pseudomonas</i>, <i>Bacillus</i>, and <i>Micrococcus</i> dominated, while representatives of the genera <i>Acetobacterium</i>, <i>Arthrobacter</i>, and <i>Acinetobacter</i> demonstrated abundance as subdominant groups. Bacterial strains of the genera <i>Rhodococcus</i> and <i>Sarcina</i> represented minor components. Bacterial strains of the genera <i>Rhodococcus</i> and <i>Sarcina</i> represented minor components. Overall, oligotrophic and psychrotolerant microorganisms, as well as small forms of prokaryotes and fungi, predominated among the culturable microorganisms. All soil biological activity parameters decreased with depth across the soil profiles and from background ecosystems to anthropogenically disturbed ones.
Журнал: Eurasian Soil Science
Выпуск журнала: Т.59, №7
Номера страниц: 1-19
ISSN журнала: 10642293
Место издания: Moscow
Издатель: Pleiades Publishing, Ltd.