Variations in biomass of fungal guilds are primarily driven by factors related to soil conditions in Mediterranean Pinus pinaster forests

• Published in: Biology and fertility of soils Vol. 58; no. 4; pp. 487 - 501
• Main Authors: Hagenbo, Andreas, Alday, Josu G., Martínez de Aragón, Juan, Castaño, Carles, de-Miguel, Sergio, Bonet, José Antonio
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-05-2022; Springer Nature B.V
• Subjects: Agriculture; Ascomycota; Availability; Biomass; Biomedical and Life Sciences; Carbon; Carbon cycle; Chemical properties; Chemicophysical properties; Community composition; Composition; Dynamics; Environmental changes; Environmental factors; Environmental management; Ergosterol; Forest management; Forests; Fungi; Guilds; Life Sciences; Microclimate; Mineral nutrients; Nutrient availability; Nutrient balance; Nutrient cycles; Nutrients; Original Paper; Pathogens; Pine trees; Pinus pinaster; Potassium; Soil; Soil chemistry; Soil conditions; Soil microorganisms; Soil nutrients; Soil properties; Soil Science & Conservation; Soils; Thinning; Variation; Weather; Yeasts; Fungal biomass; Ergosterol; Soil nutrients; Environmental drivers; Soil fungi; Mycorrhiza
• ISSN: 0178-2762; 1432-0789
• DOI: 10.1007/s00374-022-01621-4

Soil fungi are vital for regulating ecosystem carbon balance and productivity, by driving processes related to soil carbon and nutrient cycling. The rate and capacity of fungi-mediated processes are linked to fungal biomass dynamics and identifying the drivers of fungal biomass is important for predicting ecosystem responses to environmental changes. Here, ergosterol-based fungal biomass estimates and ITS2-based fungal community composition profiles were used to assess biomass of fungal guilds. Effects of forest management (thinning), environmental factors (soil chemical properties, microclimate, weather and forest stand composition) and season were related to the fungal biomass dynamics to identify the guild-specific drivers of biomass. Biomass of most fungal guilds increased with nutrient availability (nitrogen and potassium in particular) and decreased with forest thinning, and variation in total biomass was mainly driven by variation in mycorrhizal biomass. Most fungal guilds reached a minimum in biomass during summer except for mycorrhizal and root-associated ascomycetes, which instead reached a minimum during winter. Mycorrhizal fungi and root-associated ascomycetes displayed similar spatiotemporal variability in biomass. Yeasts and moulds were the only fungi displaying strong linkages with microclimate, whereas pathogenic and moss-associated fungi largely diverged in their responses to the environmental factors. The results of our study highlight that environmental factors related to the availability of soil nutrients may have an overall stronger effect on variation in biomass of fungal guilds in Mediterranean
Pinus pinaster
forests than direct influences of microclimate, weather and forest management.