Effects of Land Conversion on Soil Microbial Community Structure and Diversity in Songnen Plain, Northeast China

To feed the growing human population, natural grasslands are being converted to agricultural use at a massive scale. This conversion may have consequences for soil biodiversity, but its impact on community assembly of differentially microbial groups remains largely unknown. Here, we selected three typical land-use types: grassland, arable land (formerly grassland), and forest grassland) in Songnen Plain, Northeastern China. Illumina MiSeq high-throughput sequencing technology based bacterial 16S rRNA fungal ITS was used study structures diversities bacteria fungi explore drivers these changes. The results showed that diversity did not change after grassland land, affected abundance phylum level. Actinomycetes Proteobacteria were significantly reduced, Acidobacteria increased, Gemmatimonadetes Bacteroidetes most abundant land. Land had significant effects both abundance. After into forest, decreased, increased significantly, Ascomycetes decreased Basidiomycetes became dominant phylum, especially white rot fungi. Interestingly, Zygomycota still Ascomycetes. Canonical correlation analysis (CCA) pH, MC, NO3−-N, TP, AP, other factors important affecting composition communities. In this area, communities is mainly driven by changes pH texture, closely related nutrient utilization. Changes patterns an effect structure changing physical chemical properties soil.