土壤微生物是陆地生态系统的重要组成部分，影响着土壤形成和肥力、植物生长和胁迫耐受性、养分周转和碳储存等过程。本研究于山西亚高山鬼箭锦鸡儿灌丛采集了腐殖质层、0～10、10～20、20～40、40～80 cm 土壤样品，探究不同深度土壤细菌群落组成、多样性以及土壤剖面细菌群落的构建机制。结果表明:芦芽山鬼箭锦鸡儿灌丛优势细菌门为放线菌门(19％～28％)、绿湾菌门(10％～36％)、酸杆菌门(15％～24％)和变形菌门(9％～25％)。芦芽山鬼箭锦鸡儿灌丛土壤细菌群落α-多样性沿土壤深度的增加而显著降低，并且不同深度土壤细菌群落的β-多样性存在显著差异。土壤pH、含水量和酶活性是影响细菌群落分布格局的主要生态因子。腐殖质层和0～10cm 土层土壤细菌群落具有更复杂的相互作用关系，但整体上鬼箭锦鸡儿灌丛土壤细菌群落以共存作用为主。土壤细菌群落的构建主要以随机过程为主。
Distribution pattern and influencing factors of bacterial communities in different soil depths of Caragana jubata shurb in Luya Mountain,China
Soil microorganisms are important components of terrestrial ecosystems,affecting soil formation and fer-tility,plant growth and stress tolerance,nutrient turnover and carbon storage.In this study,we collected soil sam-ples(humus layer,0-10 cm,10-20 cm,20-40 cm,and 40-80 cm)from Caragana jubata 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 dis-tribution 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 C.jubata shrubland,and the soil bacterial community assembly was driven by random process.
万方数据
