3.2 Relationship between soil microorganism biomass and soil
environmental factors
The sample sequences of all stands were clustered, and the results
showed that the bacterial communities of the samples consisted of 36
phyla, 78 classes, 148 orders, 276 families, 464 genera, and 900
species. At the level of similarity of 0.97, 2922 operational taxonomic
units (OTUs) were classified in the bacterial samples. The fungal
communities of the samples consisted of 10 kingdoms, 27 phyla, 46
classes, 71 orders, 88 families, 96 genera, and 132 species. At the
level of similarity of 0.97, 2922 OTUs were classified in the fungal
samples. Each OTU has its corresponding species, and many different OTUs
correspond to the same species. Combining OTUs of the same species and
statistically analyzing the changes of species composition among
different samples enables the diversity of microflora among different
samples to be understood.