Why are most ecosystems unsampled for soil fungi?

The gap beneath our feet

Soil fungi form vast, intricate networks that regulate nutrient cycling, plant health and carbon storage across terrestrial ecosystems. Yet global surveys show only about 30% of ecosystem types have been sampled for the fungal communities that live belowground—leaving more than 70% effectively uncharacterized. That shortfall reflects a mix of scientific, logistical and historical factors.

What limits sampling

• Geographic bias: most studies focus on temperate and accessible regions, leaving tropical, alpine, arid, and remote ecosystems underrepresented.
• Method complexity: robust fungal sampling requires coordinated soil collection, molecular lab work (DNA sequencing and analysis), and standardized metadata on soil properties and vegetation.
• Resource constraints: long‑term, global sampling campaigns are expensive and need sustained funding, lab capacity, and trained personnel.
• Taxonomic challenge: fungal diversity is huge and many species are poorly described; interpreting DNA reads into named species remains difficult.

Why the gap matters

Under‑sampling creates blind spots in multiple areas: climate models use soil processes to estimate carbon gains and losses; agriculture relies on soil microbiomes for plant productivity and disease resistance; conservation plans need baseline biodiversity data to set priorities. Without broad, representative sampling, predictions about ecosystem responses to warming, land‑use change, or invasive species carry large uncertainties.

Where to go next

Researchers recommend scaling global coordinated efforts that combine standardized field protocols, high‑throughput sequencing, open data sharing, and targeted funding for underrepresented regions. Filling these gaps will improve ecological forecasting, restore degraded soils more effectively, and reveal unknown fungal lineages that may be critical for ecosystem resilience.