Effect of Biogas Residue on Saline Soil Microbial Community Structure based on High-Throughput 16S rRNA Metagenomics Analyses

摘要

Soil salinization is a relatively common form of soil degradation in semiarid and arid regions of northern China. This phenomenon threatens the development of agriculture as well as the ecosystem. The purpose of this study was to investigate the improvement effect of biogas residue on saline soils by comparing the microbial community structure of saline soil, farmland soil and saline soil improved with biogas residue in the Tumochuan Plain of Inner Mongolia, China. The microbial community structures were examined using high-throughput 16S rRNA metagenomic analysis. Due to the improvement of biogas residue, the pH of saline soil was decreased from 8.27 to 7.96, the total salt content was decreased from 2.89 to 2.08, and the water content was decreased from 6.53 to 4.33%. The application of biogas residue increased the abundance of Acidobacteria at the phylum level and GP4 and GP6 at the order level in the saline soil. The microbial community structure and composition of saline soils amended with biogas residue were similar to those of farmland soil. The biogas residue had a positive effect on the microbial community of the saline soil and contributed to its improvement.