Seasonal dynamics of bacterial communities in aBetula albosinensisforest

Abstract

Soil bacteria play a key role in nutrient cycling, but the mechanisms behind seasonal variation of bacterial communities in different types of soil remain unclear. In this study, the bacterial composition during four seasons and at four soil depths (0–10, 10–20, 20–40 and 40–60 cm) in a Betula albosinensis forest of the Qinling Mountains (southern Shaanxi Province, China) was investigated. Illumina 16S rRNA gene sequencing was used to analyse soil bacterial diversity and communities. The soil properties, including temperature, pH, water content, organic carbon and total nitrogen content, were determined. Soil bacterial diversity did not decrease with increasing depth, indicating that the bacterial communities in the top‐ and sub‐soil had adapted to the availability of different substrates at different depths. The Chao1 richness and Shannon diversity indices at the four depths typically decreased by 54.43–86.87% and 13.31–33.91%, respectively, from warm summer to cold winter, which was probably a result of the decrease in soil temperature. Moreover, the abundance of Acidobacteria increased with soil temperature, whereas the abundance of Bacteroidetes decreased with increasing temperature. Soil temperature accounted for 49% of the total variation among the bacterial taxa. Overall, the results suggested that changes in the bacterial communities were attributable to physiological adaptation, which was controlled by soil temperature. Highlights We assessed the effects of soil depth and season on soil bacterial community structure. We used Illumina 16S rRNA sequencing to study bacterial diversity and community composition. Changes in bacterial Shannon index with soil depth were influenced by carbon type, not quantity. Soil temperature had important effects on bacterial communities and abundance.

Seasonal Microbial Community Characteristic and Its Driving Factors in a Copper Tailings Dam in the Chinese Loess Plateau

“…Therefore, any change in the microbial communities of soil can lead to changes in various biochemical processes, thus affecting the stability of degraded ecosystems in mining areas, while also playing a vital role in the efficiency of ecological restoration. Over the course of a year, soil microbes face considerable variation in seasonal environmental factors, including temperature and humidity levels (López-Mondéjar et al, 2015) and the availability of nutrients (Du et al, 2018;Wang et al, 2018). Hence, soil microorganisms are often contingent on dynamic seasonal change characteristics.…”

New Insights into the Ecology and Physiology of Methanomassiliicoccales from Terrestrial and Aquatic Environments

“…In this culture, Desulfovibrionales were dominated by sequences affiliated to the genus Desulfovibrio , a genus within which certain species are known to produce TMA, ethanol, and acetate from choline fermentation [ 85 ]. A predominance of Bacteroidetes , Firmicutes , and Methanomassiliicoccales was also reported for an environmental sample, in this case, a birch forest soil in winter [ 86 ]. Apart from methanogenic Archaea , other Archaea represented a marginal fraction of the total prokaryotic diversity, accounting for 46.2% and 2.3% of total read sequences at T1 and T2, respectively, to less than 0.1% of total sequences after the second week of incubation ( Figure S3A,B ).…”

Application Progress of Culturomics in the Isolated Culture of Rhizobacteria: A Review

“…The reality of global warming is indisputable. Several studies have suggested that temperature plays a crucial role in shaping both the abundance and composition of bacterial communities, thereby influencing plant productivity. , In laboratory conditions, the length of incubation time also affects the structure of bacterial communities in the culture medium. Contrary to common belief that rare and difficult-to-cultivate bacterial species grow slowly and increase after a prolonged incubation, studies have shown that not all bacteria require extended preincubation times to grow .…”