Distribution pattern and influencing factors of bacterial communities in different soil depths of Caragana jubata shurb in Luya Mountain,China
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维普
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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.
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.
维普
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