PDF
Full
Outline
Objective To investigate the sedimentary characteristics of dolomite, the bacterial community structure, and their relationships with environmental factors in the sediments of Jibuhulangtu Salt Lake, Inner Mongolia. Methods Sediments were collected from four sites along an offshore-to-nearshore transect in Jibuhulangtu Salt Lake. Bacterial community composition, mineralogical characteristics, and physicochemical parameters of sediments were analyzed by 16S rRNA gene sequencing, X-ray diffraction with Rietveld refinement, and scanning electron microscopy with energy-dispersive spectroscopy, and ion chromatography. Results After removal of soluble salts, the dolomite content in the sediments ranged from 48.75% to 75.28%. The dolomite particles primarily exhibited a nano-spherical shape and transformed from regular spheres to spherical aggregates with the increase in depth. The Mg/Ca molar ratios of the dolomite ranged from 0.87 to 1.46, approaching the stoichiometric value (1.00) of ideal dolomite. At the phylum level, the five most abundant bacterial groups were Actinomycetota, Pseudomonadota, Gemmatimonadota, Chloroflexota, and Acidobacteriota. The sulfate-reducing phylum Desulfobacterota was also abundant (4.23%). Alpha diversity analysis revealed significant differences in bacterial community diversity among sampling sites (P<0.05), with site J4 exhibiting the highest species richness but the lowest evenness. Redundancy analysis indicated that the concentrations of SO42-, Mg2+, K+, Ca2+, Cl-, and F- were the key environmental factors significantly shaping the bacterial community structure. Conclusion Dolomite is abundant in the sediments of Jibuhulangtu Salt Lake. Its formation is likely attributable to the extremely high sulfate concentrations and high Mg/Ca ratio of the lake water, as well as the metabolic activities of key functional groups such as sulfate-reducing bacteria.
PDF
27
9
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
