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High-throughput sequencing technology, non-metric multidimensional scaling (NMDS), neutral community model (NCM) and structural equation modelling (SEM) were used to analyze sediment physicochemical properties, bacterial structural features, community assembly, and driving mechanisms in order to examine the bacterial community structure characteristics and community assembly processes of sediments in the Second Drainage Channel of Yinchuan City. The findings indicated that whereas total nitrogen (TN) and ammonium nitrogen (NH4-N) concentrations did not substantially correlate with α-diversity indices, electrical conductivity (EC) did considerably positively correlate with Chao1, Observed, Shannon, and Simpson diversity indices. Thiobacillus, Bacteroidetes_vadinHA17, and Dechloromonas were the major genera in the bacterial phyla Proteobacteria and Desulfobacterota. Results from PER-SIMPER, DNCI, and the NCM model consistently showed that stochastic processes dominated the bacterial community assembly between August 2021 and August 2022. EC, NH4-N, and total phosphorus (TP) were the main drivers of the neutrality model's stochasticity (R2) and the stability of the co-occurrence network structure, according to SEM analysis. Co-occurrence network stability was specifically directly and significantly impacted negatively by EC (r=-0.369) and positively by TP (r=0.504). The research revealed the bacterial assembly methods, co-occurrence network topology, and the driving impacts of physicochemical parameters on R2 and network stability, in addition to advancing the understanding of structure characteristics of bacterial communities in aquatic sediments.
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| 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 |
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