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In order to analyse the response of bacterial community structure to the abundance of nitrogen (N) and phosphorus (P) metabolic functions in different water depths of lakes, this paper presents a characterization of the spatial distribution and correlation of bacterial community structure and the abundance of N and P related metabolic functions in the surface, middle and bottom waterbodies by high-throughput sequencing technology, with Lake Dali as the object of the study. The results showed that the composition of the dominant bacterial communities in the surface, middle and bottom water layers varied significantly with the changes in the physical and chemical properties of the water. Based on the ecological network, the dominant and important genera under the first five dominant phyla were analysed under the screening criteria of degree and abundance values, and the dominant genera in the different depths of Lake Dali were significantly changed, such as three genera in the surface and middle water, and two genera in the bottom water. Comparatively, CL500-29_marine_group and Thermus in the surface water, Synechococcus and norank_o__NB1-n in the middle water, and Synechococcus、norank_o__NB1-n、norank_f__CK06-06-Mud-MAS4B-21 in the bottom water, remained consistent with the two screening criteria. Further PICRUSt2 prediction of the functional composition of the bacterial community yielded 6 primary functions and 12 secondary metabolic functions. In particular, although Pseudomonas,Paracoccus and Synechococcus showed significant positive correlation with the abundance of N and P metabolic functions, the correlation with the N and P content of different forms was different, such as Pseudomonas showed positive correlation with the change of N and P content, Paracoccus showed negative correlation with the N and P content, and Synechococcus showed negative correlation with N and positive correlation with P elements. Overall, the differences in N and P contents caused by changes in water depth had significant effects on N and P metabolism and the dominant genera.
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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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