Wood-decay type and fungal guild dominance across a North American log transplant experiment
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We incubated 196 large-diameter aspen (Populus tremuloides), birch (Betula papyrifera), and pine (Pinus taeda) logs on the FACE Wood Decomposition Experiment encompassing eight climatically-distinct forest sites in the United States. We sampled dead wood from these large-diameter logs after 2 to 6 y of decomposition and determined wood rot type as a continuous variable using the lignin loss/density loss ratio (L/D) and assessed wood-rotting fungal guilds using high-throughput amplicon sequencing (HTAS) of the ITS-2 marker. We found L/ D values in line with a white rot dominance in all three tree species, with pine having lower L/D values than aspen and birch. Based on HTAS data, white rot fungi were the most abundant and diverse wood-rotting fungal guild, and soft rot fungi were more abundant and diverse than brown rot fungi in logs with low L/D values. For aspen and birch logs, decay type was related to the wood density at sampling. For the pine logs, decay type was associated with the balance between white and brown/soft rot fungi abundance and OTU richness. Our results demonstrate that decay type is governed by biotic and abiotic factors, which vary by tree species.
KeywordsWood rot fungi Decay type Soft rot White rot FACE HTAS Metabarcoding Brown rot
Maillard, François; Jusino, Michelle A.; Andrews, Erin; Moran, Molly; Vaziri, Grace J.; Banik, Mark T.; Fanin, Nicolas; Trettin, Carl C.; Lindner, Daniel L.; Schilling, Jonathan S. 2022. Wood-decay type and fungal guild dominance across a North American log transplant experiment. Fungal Ecology. 59(1): 101151-. https://doi.org/10.1016/j.funeco.2022.101151.