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Soil physicochemical properties and fungal communities are pivotal factors for continuous cropping of American ginseng ( Panax quinquefolium  L.). However, the response of soil physicochemical properties and fungal communities to replant disease of American ginseng has not yet been studied. High-throughput sequencing and soil physicochemical analyses were undertaken to investigate the difference of soil fungal communities and environmental driver factors in new and old ginseng fields; the extent of replant disease in old ginseng fields closely related to changes in soil properties and fungal communities was also determined. Results indicated that fungal communities in an old ginseng field were more sensitive to the soil environment than those in a new ginseng field, and fungal communities were mainly driven by soil organic matter (SOM), soil available phosphorus (AP), and available potassium (AK). Notably, healthy ginseng plants in new and old ginseng fields may influence fungal communities by actively recruiting potential disease suppressive fungal agents such as  Amphinema ,  Cladophialophora ,  Cadophora ,  Mortierella,  and  Wilcoxina . When these key groups and members were depleted, suppressive agents in the soil possibly declined, increasing the abundance of pathogens. Soil used to grow American ginseng in the old ginseng field contained a variety of fungal pathogens, including  Alternaria ,  Armillaria ,  Aphanoascus ,  Aspergillus ,  Setophoma,  and  Rhexocercosporidium . Additionally, micro-ecological factors affecting disease outbreaks in the old ginseng field included a strengthening in competition relationships, a weakening in cooperation relationships, and a change of trophic strategies among fungal communities.   Supplementary Information  The online version contains supplementary material available at 10.1007/s00203-021-02196-8.

Impacts of replanting American ginseng on fungal assembly and abundance in response to disease outbreaks