4 Conclusions
In our study, the diversity and abundance of the soil microbial community increased continually during vegetation restoration. With time, vegetation restoration led to a significantly altered soil microbial community structure. Dissolved organic matter content and structure are related to standing age, and its changes (degree of humification, organic matter composition) are key drivers of changes in microbial community composition, and that organic matter decomposition in larch forest environments is likely to occur top-down, and that the interactions between bacterial and fungal relationships increase with increasing vegetation recovery time. The study provided a deeper understanding of the vertical movement of dissolved organic matter and microbial interactions in the process of vegetation restoration.