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Sammanfattning

Background Fungal traits such as host specificity and hydrophobicity of ectomycorrhizae may correspond to functional attributes including enzymatic capabilities, carbon (C) demand from host plants, temporal patterns of fruiting, C sequestration, and nitrogen (N) sequestration. Here, we assessed how these traits influenced the timing of C dynamics and fungal processing of C and N, as integrated by patterns of delta C-13, delta N-15, %N, and timing of ectomycorrhizal sporocarp production.Methods We linked these sporocarp patterns to ectomycorrhizal hydrophobicity, host specificity, and daily gross primary production (GPP) across seven N fertilization treatments in two Swedish Pinus sylvestris forests.Results of eight and 7-10 days prior to collection correlated positively with delta C-13 and negatively with %N, respectively, for similar to 80% of sporocarps, reflecting transit times of peak delivery of plant-derived carbohydrates to sporocarp formation. Hydrophobic taxa fruited 7-10 days later than hydrophilic taxa and conifer-specific sporocarps averaged four days later than generalists. Hydrophobic taxa and conifer-specific taxa were higher in delta N-15 than hydrophilic taxa and generalist-associated taxa.Conclusions Higher delta N-15 and later sporocarp collections suggested greater C demands for hydrophobic and conifer-specific taxa than for hydrophilic and generalist taxa. C accumulation times and high sequestration (hydrophobic taxa, host-specific taxa) versus low sequestration (hydrophilic taxa, generalist taxa) of N-15-depleted chitin and C-13-enriched carbohydrates in mycelia could account for late fruiting, N-15 enrichment, and C-13 depletion of hydrophobic taxa. We conclude that sporocarp production, hydrophobicity, and host specificity integrated functional information about belowground hyphal development and C accumulation times of C transfers from host Pinus.

Nyckelord

Carbon isotopes; Nitrogen isotopes; Ecosystem modeling; Nitrogen fertilization; Photosynthesis; Stoichiometry

Publicerad i

Plant and Soil
2025, volym: 511, nummer: 1, sidor: 867-883
Utgivare: SPRINGER

SLU författare

UKÄ forskningsämne

Markvetenskap

Publikationens identifierare

  • DOI: https://doi.org/10.1007/s11104-024-07022-w

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/139239