Soil characteristics and Alpha diversity indexes of microbial communities
The characteristics of 16 soil samples were analyzed concerning WC, pH, TOC, TN, AP, and AK (Table 1). The water content of the investigated samples ranged from 5.2 g/kg to 34.4 g/kg. Unexpectedly, the WC in sandy land samples significantly higher than shrub land and forest land. The soil pH value in all samples was below 7.00, the revegetation increased the pH value, but not significantly. The soil TN value ranged from 0.155 g/kg to 0.676 g/kg and the growth of vegetation increase the TN content. Likewise, the TOC of shrub land and forest samples were higher than sandy land. The C/N was highest in forest samples. Furthermore, The AP content in shrub land and forest samples were higher than sandy land. Although the AK have differences among each land type, the ANOVA analysis showed that there were no significantly different from one another.
With the growth of plants, the Chao1 index and Shannon index of soil bacteria are all significantly increased compared with the sandy land (p<0.05) (Table 2). While the soil fungal alpha diversity showed a different trend. The fungal Chao1 index of shrub land samples significantly higher than sandy land samples whereas forest samples were lower than sandy land samples. The growth of shrub did not significantly change the fungal Shannon indices compared with sandy land samples. Yet, the forest significantly decreased the Shannon index compared with the sandy land samples (p<0.05) (Table 2).