Distinct fungal successional trajectories following wildfire between soil horizons in a cold-temperate forest

The New Phytologist
Teng YangHaiyan Chu

Abstract

Soil fungi represent a major component of belowground biodiversity that determine the succession and recovery of forests after disturbance. However, their successional trajectories and driving mechanisms following wildfire remain unclear. We examined fungal biomass, richness, composition and enzymes across three soil horizons (Oe, A1 and A2) along a near-complete fire chronosequence (1yr, 2yr, 8yr, 14yr, 30yr, 49yr and ~260yr) in cold-temperate forests of the Greater Khingan Mountains, China. The importance of soil properties, spatial distance and tree composition were also tested. Ectomycorrhizal fungal richness and β-glucosidase activity were strongly reduced by burning and significantly increased with time-since-fire in the Oe horizon but not in the mineral horizons. Time-since-fire and soil C/N ratio were the primary drivers of fungal composition in the Oe and A1/A2 horizons, respectively. Ectomycorrhizal fungal composition was remarkably sensitive to fire history in the Oe horizon, while saprotroph community was strongly affected by time-since-fire in the deeper soil horizon and this effect emerged eighteen years after fire in the A2 horizon. Our study demonstrates pronounced horizon-dependent successional trajectories fol...Continue Reading

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