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  • Glossary item | Last updated: 19 Mar 2025

Below ground biomass

All biomass of live roots. Fine roots of less than 2 mm diameter are excluded because these often
cannot be distinguished empirically from soil organic matter or litter.

FAO. 2023. “Terms and Definitions - FRA 2025.” Forest Resources Assessment (FRA) Working Paper 194. Rome, Italy: Food and Agriculture Organization of the United Nations.

Source category: International Organisation