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Changes in soil fungal communities following anthropogenic disturbance are linked to decreased lodgepole pine seedling performance Beck, Jackson; Cale, Jon; Rodriguez-Ramos, Jean; Kanekar, Sanat; Karst, Justine; Cahill, James; Simard, Suzanne; Erbilgin, Nadir

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Summary 1. Disturbances are frequent events across the Canadian boreal forest and can affect both below and above ground ecosystem processes. How disturbances change belowground soil fungal communities and in-turn affect pine establishment and performance is poorly understood. Such understanding has become increasingly important in-light-of observed changes in disturbance regimes in recent years due to climate change. 2. We used a greenhouse experiment to determine how soil inoculum collected from lodgepole pine stands undisturbed (control) or disturbed by fire, mountain pine beetle outbreak, logging, and salvage-logging affect pine seedling performance in western Canada. We first characterized whether fungal communities of seedling roots change as a function of inoculum source, and then determined whether changes in fungal community composition impact pine seedling performance (biomass and height). 3. Root fungal communities of pine seedlings from logged and salvage-logged disturbances differed from their respective paired controls, while soils from natural disturbances (fire and beetle outbreak) did not. Among disturbances, the pine root fungal communities of fire and salvage-logged disturbances differed. 4. In parallel to the root fungal communities, seedling performance also decreased when comparing logging and salvage-logging disturbances to paired controls. Among disturbance treatments, seedlings from the salvage-logged disturbance did not grow as big as seedlings inoculated with soils from burned forests. Synthesis and Application. These findings indicate that anthropogenic disturbances (logging and salvage-logging) can have cross-generational impacts on pine seedling performance, through functional shifts in seedling root fungal community structure. Furthermore, the impacts of soil fungi on pine seedlings appear to be pronounced following salvage-logging, stressing the importance of compound disturbance events. These findings may be of importance to land managers considering clear-cut logging or salvage logging in pine forests, particularly where soil biotic communities are likely to be one of the predominate factors in pine establishment.

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