[Effect of High-volume Straw Returning and Applying on Bacterial Community and Fertility of Desertification Soil].

This study was conducted to explore the fertilization potential of the high-volume straw returning mode in cooperation with and other functional flora on desertification soil and to analyze the changing characteristics of soil carbon, nitrogen, and phosphorus components and functional activities of flora, so as to provide a basis for efficiently improving desertification soil fertility. A randomized block experiment was conducted, setting straw not returning to field (CK) and high-volume straw returning of 6.00 kg·m (ST1), 12.00 kg·m (ST2), 24.00 kg·m+(ST3), 6.00 kg·m+ (SM1), 12.00 kg·m+ (SM2), and 24.00 kg·m+ (SM3). In this study, we conducted a randomized block experiment to investigate the effect of the treatment for soil microbial and nutrient contents using 16S rRNA high-throughput sequencing and soil biochemical properties analysis. Our results showed that:① the diversity of the soil bacterial community was significantly reduced by the combination of high-volume straw returning and application. ② The single mode of high-volume straw returning significantly enriched Proteobacteria and decreased the relative abundance of Actinobacteriota, and the effect of the combined application of on the variability of bacterial community structure was more significant. At the genus level, the relative abundance of beneficial bacteria such as and increased significantly. ③ The functional prediction based on FAPROTAX found that the high-volume straw returning combined with could significantly improve the decomposition potential of soil flora to organic substances and the transformation potential of nitrogen components. ④ Compared with that in the control, the application of with high-volume straw returning significantly increased the contents of soil organic matter, total phosphorus, and available phosphorus by 31.20-32.75 g·kg, 0.11-0.18 g·kg, and 29.69-35.09 mg·kg, respectively. In conclusion, the application of in the sand-blown area with a high-volume straw returning can notably improve the contents of soil organic matter and phosphorus components, the functional activity of bacteria, and the abundance of beneficial bacteria, which is of great significance to the rapid improvement of soil fertility in the middle- and low-yield fields in arid areas.