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Nitrification inhibitors can affect the biological transformation process of ammonium nitrogen to nitrate nitrogen in soil by inhibiting the activity of ammonia-oxidizing bacteria (AOB). Objective To investigate the effects of the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) on the community structure and assembly mechanisms of AOB in coastal saline-alkaline paddy soil. Methods To study the effects of the typical nitrification inhibitor DMPP addition on the diversity, community structure, and community assembly process of AOB in soil under two salinity levels. Pot experiments and high-throughput sequencing were employed to determine the diversity, community structure, and community assembly process of AOB. Results The addition of DMPP increased the alpha diversity of AOB in soil, which reached a significant level in the high-salinity soil. The addition of DMPP significantly changed the community composition of AOB, reducing the relative abundance of taxa with high relative abundance and enriching the taxa with low relative abundance. The decrease in relative abundance of taxa with high relative abundance was the main reason for the inhibition of DMPP on nitrification. Principal coordinates analysis revealed that the community structure of AOB changed significantly after the addition of DMPP, which was more obvious in high-salinity soil. The null model analysis results showed that stochastic processes played a dominant role in the community assembly process of AOB, and the contribution of stochastic processes increased after the addition of DMPP. Canonical correspondence analysis and Mantel’s test indicated that soil pH, electrical conductivity, organic matter, total nitrogen, and alkaline-hydrolyzable nitrogen were the main physicochemical factors influencing changes in AOB community structure. Conclusion DMPP exerted significant impacts on AOB communities in coastal saline-alkaline paddy soils across varying salinity levels, with its inhibitory effects varying substantially with soil salinity.
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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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