Forest disturbances have a strong effect on soil fungal communities and associated ecosystem processes. However, little is known about the response of mycelial biomass to disturbances, and how fungi reallocate carbon into different fungal structures under environmental stressors. We investigated above- and below-ground fungal biomass shifts in response to different intensities of forest management in Mediterranean Pinus pinaster forests. Soil fungal biomass was estimated by ergosterol quantification and production of sporocarps was estimated from repeated field samplings during 5 years in 26 experimental plots. Abundance of mycorrhizal and saprotrophic fungi belowground was determined using Pacific Biosciences sequencing of fungal ITS2 amplicons. Thinning had a prolonged negative effect belowground, inter- and intra-annually, on total fungal biomass and on the biomass of ectomycorrhizal fungi, but not on saprotrophic fungi. Total and ectomycorrhizal mushroom yields were negatively correlated with the total and the ectomycorrhizal mycelial biomass, respectively. Thinning also correlated positively with the aboveground/belowground ratio of both total and ectomycorrhizal fungal biomass. We show potential short-term shifts in resource allocation of fungi from below-to above-ground structures under disturbances such as forest thinning. Ectomycorrhizal fungi may respond to disturbances by increasing reproduction rather than colonizing the surrounding soil.

森林干扰对土壤真菌群落和相关的生态系统过程有很大影响。然而，关于菌丝生物量对干扰的反应以及在环境胁迫下真菌如何将碳重新分配到不同的真菌结构方面，人们所知甚少。我们调查了地中海松松林地上和地下真菌生物量的变化，以响应不同强度的森林经营森林。通过麦角固醇定量来估算土壤真菌生物量，并通过在26个试验区中的5年重复田间采样来估算子果皮的产量。利用Pacific ITS2真菌真菌ITS2测序确定地下菌根和腐生真菌的丰度。在地下，年际和年内，间苗对真菌总生物量和外生菌根真菌的生物量均具有延长的负面影响，但对腐生真菌没有影响。蘑菇总产量和菌根菌丝产量分别与菌丝体菌丝总量和菌丝含量呈负相关。变薄也与总和外生菌根真菌生物量的地上/地下比率呈正相关。我们显示了在森林稀疏等干扰下，真菌资源分配从地下结构到地下结构的潜在短期变化。外生菌根真菌可能通过增加繁殖而不是定居在周围土壤中来应对干扰。