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Long-term Consequences on Soil Fungal Community Structure: Monoculture Planting and Natural Regeneration

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Abstract

Understanding the regeneration and succession of belowground communities, particularly in forests, is vital for maintaining ecosystem health. Despite its importance, there is limited knowledge regarding how fungal communities change over time during ecosystem development, especially under different forest restoration strategies. In this study, we focused on two restoration methods used in northern Japan: monoculture planting and natural regeneration. We examined the responses of the fungal community to monoculture plantations (active tree planting) and naturally regenerated (passive regeneration) forests over a 50-year chronosequence, using natural forests as a reference. Based on DNA metabarcoding, we assessed the richness of fungal Operational Taxonomic Units (OTUs) and their dissimilarity. Our findings revealed that soil fungal richness remained stable after natural regeneration but declined in monoculture plantations, from 354 to 247 OTUs. While the compositional dissimilarity of fungal assemblages between monoculture plantations and natural forests remained consistent regardless of the time since tree planting, it significantly decreased after natural regeneration, suggesting recovery to a state close to the reference level. Notably, the composition of key functional fungal groups—saprotrophic and ectomycorrhizal— has increasingly mirrored that of natural forests over time following passive natural regeneration. In summary, our study suggests that monoculture plantations may not be effective for long-term ecosystem function and service recovery because of their limited support for soil fungal diversity. These results underscore the importance of natural regeneration in forest restoration and management strategies.

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Acknowledgements

We thank the Teshio Experimental Forest of Hokkaido University staff, the students at Tokyo University of Agriculture, and the Akira S Mori Lab members for their support with field and laboratory work. We also thank Kenichi Watanabe for his assistance with the soil sample analyses. The Arctic Challenge for Sustainability II provided logistical support for the study.

Author contributions

MN: Conceptualization, Methodology, Investigation, Data curation, Formal analysis, Writing—original draft, Writing—review & editing, Visualization. SM: Conceptualization, Investigation, Writing—review & editing. KN: Conceptualization, Investigation, Writing—review & editing. SM: Methodology, Writing—review & editing. ST: Conceptualization, Investigation, Writing—review & editing. YK: Investigation, Writing—review & editing. KFS: Investigation, Writing—review & editing. XX: Writing—review & editing. TK: Conceptualization, Investigation, Writing—review & editing. NK: Conceptualization, Investigation, Writing—review & editing. KM: Resources, Writing—review & editing. K-iO: Investigation, Writing—review & editing. MU: Resources, Writing—review & editing. KT: Conceptualization, Resources, Writing—review & editing. ASM: Conceptualization, Investigation, Writing—review & editing, Funding acquisition, Supervision, Project administration.

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Correspondence to Minagi Naka.

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Naka, M., Masumoto, S., Nishizawa, K. et al. Long-term Consequences on Soil Fungal Community Structure: Monoculture Planting and Natural Regeneration. Environmental Management 73, 777–787 (2024). https://doi.org/10.1007/s00267-023-01917-7

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  • DOI: https://doi.org/10.1007/s00267-023-01917-7

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