Institute of Loess Plateau, Shanxi University, Taiyuan 030006, China.
Ying Yong Sheng Tai Xue Bao. 2024 Feb;35(2):381-389. doi: 10.13287/j.1001-9332.202402.003.
Soil microorganisms are important components of terrestrial ecosystems, affecting soil formation and fertility, plant growth and stress tolerance, nutrient turnover and carbon storage. In this study, we collected soil samples (humus layer, 0-10 cm, 10-20 cm, 20-40 cm, and 40-80 cm) from shrubland in Shanxi subalpine to explore the composition, diversity, and assembly of soil bacterial communities at different depths across the soil profile. The results showed that Actinomycota (19%-28%), Chloromycota (10%-36%) and Acidobacteria (15%-24%), and Proteobacteria (9%-25%) were the dominant bacterial phyla. α-diversity of soil bacterial community significantly decreased with the increases of soil depth. Soil bacterial β-diversity varied across different soil depths. Soil pH, water content, and enzyme activity were the main ecological factors affecting the distribution of soil bacterial communities. Soil bacterial communities had more complex interactions in humus layer and 0-10 cm layer. On the whole, soil bacterial communities were dominated by coexistence in shrubland, and the soil bacterial community assembly was driven by random process.
土壤微生物是陆地生态系统的重要组成部分，影响土壤的形成和肥力、植物的生长和抗逆性、养分转化和碳储存。本研究从山西亚高山灌丛中采集了土壤样品（腐殖质层，0-10 cm、10-20 cm、20-40 cm 和 40-80 cm），以探讨土壤剖面不同深度土壤细菌群落的组成、多样性和组装。结果表明，放线菌门（19%-28%）、绿菌门（10%-36%）和酸杆菌门（15%-24%）以及变形菌门（9%-25%）是主要的细菌门。土壤细菌群落的α多样性随土壤深度的增加而显著降低。土壤细菌β多样性在不同土壤深度之间存在差异。土壤 pH 值、含水量和酶活性是影响土壤细菌群落分布的主要生态因素。土壤细菌群落在腐殖质层和 0-10 cm 层中的相互作用更为复杂。总的来说，灌丛中的土壤细菌群落以共存为主，土壤细菌群落的组装是由随机过程驱动的。
