不同茶树品种新梢氮磷钾含量与根际土壤细菌群落多样性差异.

[Objective] The paper aimed to study the diversity of bacterial communities in the rhizosphere soil of different varieties of tea trees, to reveal the relationship between the high nitrogen, phosphorus, and potassium content, nutrient content and the diversity of bacterial communities in the rhizosphere soil in new shoots of different varieties of tea trees, and to provide theoretical support for the organic planting and production of commercial tea. [Method] In the study, different varieties of tea trees were selected to determine the nitrogen, phosphorus and potassium contents of new shoot and analyze the physicochemical properties and the diversity of bacterial communities in the rhizosphere soil of tea plants by using soil agricultural chemistry combined with 16S rDNA high-throughput sequencing technology. Moreover, correlation analyses were conducted. [Result] There were significant differences in nitrogen, phosphorus, and potassium content of new shoots of different varieties. Among different tea tree varieties, the varieties with higher nitrogen content in new shoots had higher pH, organic matter, total nitrogen, and hydrolytic nitrogen content in the rhizosphere soil. Moreover, varieties with higher phosphorus content in new shoots had higher total phosphorus and available phosphorus content in the rhizosphere soil. Additionally, varieties with higher potassium content in new shoots had higher total potassium and available potassium content in the rhizosphere soil. The richness and diversity of bacterial communities were important environmental factors that contributed to the formation of nutrient differences among different varieties. Analysis of community structure showed that the dominant bacteria in the rhizosphere soil of different tea tree varieties were Proteobacteria, Actinomycetota, Cyanophyta, Chloroflexota, Planctomycetota, Bacillota, etc. The rhizosphere soil pH, contents of organic matter, hydrolytic nitrogen, available phosphorus and available potassium had a greater impact on the bacterial community structure, especially on Proteobacteria, Actinomycetota, Chloroflexota, Planctomycetota, Bacillota and Cyanophyta. [Conclusion] There were great differences of nutrient contents among the rhizosphere soil of different tea trees varieties. Tea trees with higher contents of nitrogen, phosphorus and potassium in new shoots had higher soil pH, and contents of organic matter, total potassium, available phosphorus and available potassium, leading to a greater richness and diversity of bacterial communities. It was an important environmental factor for the formation of nutrient differences in tea trees. Among different tea tree varieties, the bacterial communities of Proteobacteria, Actinomycetota, Chloroflexota, Planctomycetota, Bacillota, and Cyanophyta were relatively abundant in the rhizosphere soil of tea trees with high nutrient content. [ABSTRACT FROM AUTHOR]