Fig. 1

PCoA analysis of soil microbial community structure based on Bray-Curtis distance algorithm. a, b represent bacteria and fungi at different soil depths, and c, d represent bacteria and fungi in different month. Dots represent each sample; colors represent different groupings. The horizontal and vertical coordinates are values that cause the largest difference between samples, and reflect the influence as a percentage.10, 20, and30 represent 10 cm, 20 cm, and 30 cm of soil depth, respectively. May, Jun, Jul, Aug, and Sep represent the soil sampled in May, June, July, August, and September, respectively. The larger the R²-value, the higher the interpretation degree of the grouping to the difference, and the greater the grouping difference. When the p < 0.05, the reliability of the test is high