Abstract：The soil microbial diversity has been characterized as an important soil quality indicator. In this study, the soil bacterial community constitution of Jasminum sambac Ait was analyzed by the high throughput sequencing (Illumina Miseq) of the 16S rRNA V3-V4 hypervariable region, to investigate differences of the soil bacterial community structure among different months during the jasmine flower season and the relatedness between community structure of bacteria and soil physic-chemical properties. The results indicated that the soil bacterial diversity of J. sambac was very rich, including 41 phyla, 98 classes, 225 orders, 427 famlies and 799 genera. The 6 phyla with high abundance were Proteobacteria, Acidobacteria, Chloroflexi, Actinobacteria, Bacteroidetes and Firmicutes. The most abundant phylum in each month was Proteobacteria (22.0%~28.4%). The abundance of the phylum Acidobacteria was the lowest (11.7%) in June, suggesting the best soil quality in this month. The Shannon index and Simpson index were the maximum (6.9264) and the minimum (0.002901) in October, respectively, which reflecting the highest bacterial diversity. These results demonstrated that the low temperature was beneficial to increase the soil bacterial diversity. The results of clustering and principal component analysis showed that the bacterial community structure of the soil samples in July, August and September possessed the highest similarity, while those of the soil sample in June and October exhibited obviously difference. Heatmap and redundancy analysis indicated that soil bacterial diversity were significantly influenced by soil properties including the soil pH, organic matter, total and alkali hydrolyzable nitrogen, total and available phosphorus, total and available potassium. Among them, pH, total phosphorus and available potassium were the three most important environmental factors. Moreover, there were positive correlations between the three main bacterial phyla (Firmicutes, Actinobacteria and Chloroflexi) and the six soil environmental factors, including pH, organic matter, total nitrogen, available nitrogen, total phosphorus and total potassium. This work provides useful informations for field management of J. sambac during flower season and soil conservancy ecological balance.
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