Bin Wang, Xiaofan Na, Shengyi Huang, Zhengcai Li, Zhichun Zhou, Juying Huang, Meiyun Pu, Zhenyu Cheng, Xiaoqi He
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Abstract
Background and aims
Soil microbial communities, including fungi, play a pivotal role in the sustainability of forest ecosystems, yet the ecological processes driving their assembly with forest development remain elusive. This study aims to investigate the variations in the assembly mechanism of soil fungal communities with the development of Torreya grandis forests.
Method
Barcode sequencing was conducted to identify and characterize the fungal community in both bulk soil and the rhizosphere of T. grandis along a chronosequence spanning 900 years in a subtropical forest. The total carbon, nitrogen and phosphorus contents of plant tissues, as well as major abiotic properties of the bulk soils, were determined simultaneously.
Results
Our findings reveal that fungal community composition, rather than alpha diversity, changes with stand development, independent of shifts in plant and soil properties. As stands develop, saprotrophic fungi become enriched and fungal co-occurrence networks simplify, particularly in the bulk soil, indicating a soil environment with reduced competitive pressure for niches among fungal populations. Fungal community assembly in bulk soils is governed by dispersal limitation, whereas that of the rhizospheric assemblage transitions from dispersal limitation to homogeneous selection as stands develop. Notably, the genus Talaromyces, known for its biocontrol and plant-growth promotion capabilities, dominates the ecological process transition in the rhizosphere of T. grandis.
Conclusion
Our results propose a host-mediated deterministic selection of beneficial fungal populations in the rhizosphere as stands develop, supporting the health and ecological sustainability of ancient forest ecosystems in subtropical areas.
期刊介绍：
Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.
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