Aims The bacterial diversity in rhizosphere soil is closely associated with its environmental factors, such as, pH, moisture and organic contents. The aims of this study were to understand the bacterial diversity in tea plant Camellia sinensis rhizosphere soils and explore its relationship with major organic elements, water, and pH in tea plant rhizosphere soil. Methods The tea plant rhizosphere soils were randomly collected from five locations at the south side of Qinling Mountains. The bacterial diversity in the soil was determined by high-throughput amplicon sequencing technology. The organic elements, pH and moisture in the soil were measured using traditional analysis methods. The correlations between bacterial diversity and environmental elements were analyzed by using the General Linear Model (GLM), Canonical Correspondence Analysis (CCA) and Spearman’s rank correlation coefficients methods. Results Acidobacteria, Actinobacteria, Bacteroidetes, Chloroflexi, Gemmatimonadetes, Planctomycetes, Proteobacteria and Verrucomicrobia were the dominant phyla in the soil samples. Water content, pH, organic carbon and total nitrogen were the environmental elements that had the greatest correlation with the bacterial diversity in the rhizosphere soil samples. Nitrogen had the greatest effect on the bacterial diversity at genus level. Carbon, potassium, water and pH were positively correlated with Pedobacter and Mucilaginibacter genera. Conclusions The bacterial diversity in tea plant rhizosphere is closely associated with its environmental elements. The soil elements in tea plant rhizosphere could also be adjusted through the change of rhizobacteria diversity besides chemical fertilization.

中文翻译：

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秦岭茶树根际土壤细菌多样性及其与环境要素的关系

目的 根际土壤中的细菌多样性与其环境因素密切相关，如 pH 值、水分和有机物含量。本研究的目的是了解茶树茶树根际土壤中的细菌多样性，并探讨其与茶树根际土壤中主要有机元素、水分和 pH 值的关系。方法从秦岭南侧5个地点随机采集茶树根际土壤。通过高通量扩增子测序技术确定土壤中的细菌多样性。使用传统分析方法测量土壤中的有机元素、pH 值和水分。使用一般线性模型（GLM）分析细菌多样性与环境要素之间的相关性，典型对应分析 (CCA) 和 Spearman 等级相关系数方法。结果酸菌门、放线菌门、拟杆菌门、绿曲霉门、Gemmatimonadetes、浮游菌门、变形菌门和疣微菌门是土壤样品中的优势门。水含量、pH、有机碳和总氮是与根际土壤样品中细菌多样性相关性最大的环境元素。在属水平上，氮对细菌多样性的影响最大。碳、钾、水和 pH 值与 Pedobacter 和 Mucilaginibacter 属呈正相关。结论茶树根际细菌多样性与其环境要素密切相关。