Changes of Soil Microbial Communities in Different Succession Stages in Karst Peak Cluster Depression Around FAST
To explore the changes in soil microbial community structure and its influencing factors in different vegetation succession stages of karst peak-valley landscapes around FAST,this study took the surface soil of the three vegetation succession stages of herbaceous,shrubby,and woody vegetation as research objects,and used high-throughput sequencing technology to study the diversity,community composition,and relationships with soil chemical properties of soil microorgan-isms.The study found that as the succession progressed,the Shannon index and Chao1 index of soil bacteria and fungi showed a significant downward trend.The actinobacteria,actinomyces,and acidimicrobia were all dominant bacterial phyla in differ-ent succession stages,accounting for 34.83％,19.22％,and 18.56％of the bacterial community,respectively.The ascomycetes and basidiomycetes were dominant fungal phyla,accounting for 40.72％and 40.11％of the fungal community,respectively.According to the Pearson correlation analysis,soil pH,organic matter,total nitrogen,ammonium nitrogen,and organic matter significantly affected bacterial and fungal diversity.According to the Spearman correlation analysis,total phosphorus,total potassium,available potassium,aluminum oxide,and exchangeable magnesium were significantly negatively correlated with the proteobacteria phylum(P＜0.05),soil pH and exchangeable calcium were significantly positively correlated with the actino-myces phylum(P＜0.01),ferrimagnetic oxides were significantly negatively correlated with the ascomycetes phylum(P＜0.01),and available phosphorus was significantly negatively correlated with the basidiomycetes phylum(P＜0.01).Redundancy anal-ysis and Mantel analysis collectively indicate that soil pH is a key chemical factor that influences the composition of bacterial and fungal communities in the karst forest.The above results have important reference value for understanding the characteris-tics and laws of changes in the soil microbial community in the peak forest karst area,scientific development,and protection of the karst forest ecological environment around FAST.
万方数据
维普
