School of Biological Science and Food Engineering, Chuzhou University, No. 1 Huifeng West Road, Chuzhou, 239000, Anhui, China.
Sci Rep. 2023 Sep 22;13(1):15866. doi: 10.1038/s41598-023-42981-7.
Soil bacterial communities regulate nutrient cycling and plant growth in forests. Although these bacterial communities vary with soil nutrients and plant traits, the variation and degree with soil horizons in different forest types remain unclear. Here, bacterial communities of 44 soil samples from organic horizon (O horizon) and mineral horizon (M horizon) of three forest types (Cunninghamia, broad-leaved and Pinus forests) in subtropical forests of Dabie Mountain, China were analyzed based on amplicon sequencing. We assessed the effects of soil horizons and forest types on bacterial communities. The results showed that the bacterial richness and diversity were significantly higher in the O horizon than in the M horizon. Furthermore, the bacterial community composition and functions were also remarkably different between the two soil horizons. Furthermore, forest types could affect bacterial community composition but not for diversity and functions. Moreover, soil organic matter, including the total organic carbon, available phosphorus, total organic nitrogen, available potassium, ammonium nitrogen, and pH were main drivers for bacterial community composition. The results propose robust evidence that soil horizons strongly driven bacterial community composition and diversity, and suggest that microhabitat of soil bacterial communities is important to maintain the stability of forest ecosystem.
土壤细菌群落调节森林中的养分循环和植物生长。尽管这些细菌群落随土壤养分和植物特征而变化，但不同森林类型不同土壤层中的变化及其程度仍不清楚。在这里，基于扩增子测序，分析了来自中国大别山亚热带森林三种森林类型（杉木林、阔叶林和松林）的有机层（O 层）和矿质层（M 层）的 44 个土壤样本的细菌群落。我们评估了土壤层和森林类型对细菌群落的影响。结果表明，O 层的细菌丰富度和多样性明显高于 M 层。此外，两个土壤层之间的细菌群落组成和功能也有显著差异。此外，森林类型可以影响细菌群落组成，但不能影响多样性和功能。此外，土壤有机质，包括总有机碳、有效磷、总有机氮、有效钾、铵氮和 pH 值是细菌群落组成的主要驱动因素。结果提供了有力的证据，表明土壤层强烈驱动了细菌群落的组成和多样性，并表明土壤细菌群落的小生境对维持森林生态系统的稳定性很重要。
