**5. Conclusions**

In this study, the biodiversity and variation of AMF with plant roots at different altitudes were explored by molecular identification methods in Mt. Taibai. And it was found that there is abundant AMF diversity in the mountain ecosystem. Altitude has a significant impact on AMF diversity and community distribution. Whether it is species level or out level, Sob and Shannon indices show a quadratic equation changing trends with the increase of altitudes. In addition, whether in soil or plant roots, the ecological stoichiometry of C/N has a major impact on AMF diversity. Further, *Glomus*, as a dominant genus, was most affected by root and soil nutrients. These findings suggest that soil and root nutrient are important factors affecting AMF diversity and variation among different altitudes in the mountain forest.

**Supplementary Materials:** The following supporting information can be downloaded at: https://www.mdpi.com/article/10.3390/d14080626/s1, Table S1: Plant species at different altitudes in Mt. Taibai. Table S2: The distribution of AMF order, family, genus, and the number of AMF species aoutOTU among different altitudes.

**Author Contributions:** Conceptualization, M.Z., M.Y. and Z.S.; methodology, M.Z., M.Y. and Z.S.; software, M.Z.; validation, M.Z., M.Y., Z.S. and J.G.; formal analysis, M.Z.; investigation, M.Z., Z.S., J.G. and X.W.; resources, M.Z. and Z.S.; data curation, M.Z. and Z.S.; writing—original draft preparation, M.Z. and M.Y.; writing—review and editing, M.Z. and Z.S.; visualization, M.Z., Z.S. and X.W.; supervision, Z.S.; project administration, Z.S.; funding acquisition, Z.S. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by NSFC (32171620, 31670499), Scientific and technological research projects in Henan province (192102110128), Program for Science & Technology Innovation Talents in Universities of Henan Province (18HASTIT013), Key Laboratory of Mountain Surface Processes and Ecological Regulation, CAS (20160618).

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** The datasets presented in this study can be found in online repositories. The names of the repository/repositories and accession number(s) can be found below: SRA database and PRJNA843859.

**Conflicts of Interest:** The authors declare no conflict of interest.
