5. Conclusions
According to the results of the
present study, pH value and TP content were key soil environmental
factors driving variation in rhizosphere fungal and bacterial
β-diversity, respectively, during the restoration of R.
pseudoacacia plantations. Meanwhile, soil
NH4+-N content influenced both
bacterial and fungal β-diversity in the rhizosphere of R.
pseudoacacia . With an increase in forest age, rhizosphere microbial
communities tended to adjust their survival strategies, at the phylum
level. Compared to the fungal community network, the bacterial community
network was more stable. In addition, the bacterial network was more
complex, with higher connectivity than the fungal network. The microbial
networks had better aggregation in the nearly-mature and mature forests
(15 and 25 years old), and in the over-mature forests (35 and 45 years
old). Fungi, but not bacteria, had specific lineage changes in the
course of R. pseudoacacia forest restoration. Furthermore, the
results of the present study demonstrated the influence of soil
multifunction on microbial network modules, and the importance of core
microbiota diversity in rhizosphere soil multinutrient cycling
activities under R. pseudoacacia plantations.