Climate-induced shifts in ectomycorrhizal explorations from long to short strategies along an elevation gradient.
Chen L, Bardgett RD, Zeng W, Sun L, Ma Z
Mycorrhizal Networks
The conifers holding the treeline together in high mountain forests depend on wide-ranging underground fungal webs to pull nutrients from thin, cold soils — and those webs are quietly contracting as temperatures climb.
Trees don't find nutrients on their own — they rely on fungal partners that extend threadlike arms into the surrounding soil. This study found that the style of those fungal arms shifts with temperature: warmer forests produce short, close-in threads, while cooler high-altitude forests host long, far-reaching ones that explore much more ground. As mountain climates warm, these fungi may retreat to shorter strategies, potentially weakening trees' ability to gather the nutrients they need.
Key Findings
Researchers examined 53,262 ectomycorrhizal root tips across a temperature gradient of 0.2–5.1°C, documenting clear temperature- and soil-nutrient-driven shifts in fungal morphology.
Short hyphal forms dominated at warmer lower elevations, while thick long rhizomorphs prevailed at cooler higher elevations, achieving a foraging space of up to 1.02 × 10 units into the soil profile.
A new species-morphotype-space (SMS) framework was developed to more reliably quantify how far fungal networks actually forage beyond root tips — addressing a long-standing methodological gap in the field.
chevron_right Technical Summary
A study of 53,262 root-tip samples from a Chinese fir tree shows that the underground fungi partnering with tree roots change their soil-foraging strategy based on temperature: warmer low-elevation sites favor short, stubby fungal threads, while cooler high-elevation sites support long, wide-reaching networks. As climate warming shifts these temperature conditions, forests may lose the deep-exploring fungal partnerships that help trees survive thin mountain soils.
Abstract Preview
Ectomycorrhizal (EcM) fungi colonize over 60% of tree stems globally, yet how their hyphal morphology varies across environments remains unclear, and current methods for defining EcM mycelial morph...
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