Abstract
Background and aims
Revegetation with xeric shrubs is a widely applied measure for restoring degraded ecosystems in the deserts of northern China. However, knowledge on the soil fungal assemblages in revegetated shrubs still remains veiled. This study aimed to evaluate how soil fungal diversity and composition respond to shrub species.
Methods
We characterized soil fungal communities in three different shrublands (Artemisia ordosica, Salix psammophila, and Caragana microphylla), which had been planted on bare sandland for about 20 years, in the Mu Us Desert in northern China, using high-throughput 18S rRNA gene sequencing. The relationships of fungal community diversity and composition with environmental variables were explored by regression analysis and Mantel test, respectively.
Results
The dominant phyla across the studied samples were Ascomycota and Basidiomycota. Compared to bare sandland, fungal diversity was significantly greater in A. ordosica and C. microphylla but not in S. psammophila. There was a positive linear relationship between soil fungal and understory plant diversity. A. ordosica and C. microphylla shrublands showed the greatest relative abundance of Ascomycota; S. psammophila shrubland showed the greatest relative abundance of Basidiomycota. In terms of functional groups, the highest relative abundance of ectomycorrhizal fungi and the lowest relative abundance of pathogenic fungi were found in S. psammophila shrubland. Soil collected from A. ordosica shrubland showed the highest relative abundance of arbuscular mycorrhizal fungi.
Conclusions
Variations in fungal diversity and assemblages were directly affected by the revegetated shrub species. The strong correlation of the fungal community and shrubs provides a better understanding of soil organic carbon sequestration and plant–soil interaction in different revegetated shrublands.
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Acknowledgments
This study was supported by the National Key Research and Development Program of China (no. 2016YFC0500905), the National Natural Science Foundation of China (no. 31470711), and the Fundamental Research Funds for the Central Universities (no. 2015ZCQ-SB-02). We would like to thank the staff of the Yanchi Research Station. Special thanks to Weiwei She, Jun Liu, and Li Wang for their help with sampling and measurements in the field and laboratory.
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Fig. S1
Distribution of the bare sandland and the three shrubland in the study area. Aro, Artemisia ordosica; Sap, Salix psammophila; Cam, Caragana microphylla (PNG 12044 kb)
Fig. S2
Soil sampling schematic diagram in each plot of the bare sandland. “X” is the sampling site. (PNG 30 kb)
Fig. S3
Relationships between soil properties and fungal diversity (n = 3). SWC, soil water content; SOC, soil organic carbon; TN, total nitrogen; TP, total phosphorus (PNG 590 kb)
Table S1
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Table S2
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Table S3
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Sun, Y., Zhang, Y., Feng, W. et al. Revegetated shrub species recruit different soil fungal assemblages in a desert ecosystem. Plant Soil 435, 81–93 (2019). https://doi.org/10.1007/s11104-018-3877-1
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DOI: https://doi.org/10.1007/s11104-018-3877-1