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In this study, we measured the contents of P in various forms in the topsoil (0~10cm) of 8representative pine (Pinus massoniana) forests in the main urban area of Chongqing. We used high-throughput sequencing technology to investigate the community characteristics of the phoD-harboring bacteria. The results showed that the surface soils of Pinus massoniana forests in the study area had relatively low phosphorus levels, with average total phosphorus (TP) contents of 192.787mg/kg in winter and 169.512mg/kg in summer. Among the inorganic phosphorus fractions, the content distribution followed the order: occluded phosphorus (O-P) > iron-bound phosphorus (Fe-P) > aluminum-bound phosphorus (Al-P) > calcium-bound phosphorus (Ca-P) > exchangeable phosphorus (Ex-P), showing a seasonal pattern of higher levels in winter and lower levels in summer. The dominant phyla of phoD-harboring bacteria in the soil were Proteobacteria, Actinobacteria, and Planctomycetes, collectively accounting for 96% of the average relative abundance. Correlation analysis showed a significant negative correlation (P<0.05) between the diversity of phoD-harboring bacteria and Al-P, as well as a significant positive correlation (P<0.05) with soil pH. Redundancy analysis indicated that Al-P and pH were the most important factors influencing the community structure of phoD-harboring bacteria. In conclusion, the topsoil of pine forests in the main urban area of Chongqing is generally P-deficient, and the P content is significantly influenced by season. The forms of P occurrence affect the community structure and diversity of phoD-harboring bacteria.
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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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