Radiolab Radiolab

Forests on Forests

Apr 24, 2026

Summary

Radiolab explores the hidden ecosystems within forest canopies, featuring ecologist Nalini Nadkarni and researcher Karina Mifune. They reveal that tree branches hold deep soil layers teeming with life, including salamanders and aquatic copepods. These "sky gardens" provide crucial nutrients like nitrogen and phosphorus, allowing trees to grow roots upward to access resources when the forest floor is scarce. This discovery highlights a complex, vertical layer of biodiversity often overlooked by science.

Topics discussed

Home Depot Spring Garden Deals Introduction: From Tree to Shining Tree and the Underground Network Meeting Nalini Nadkarni: The Queen of the Canopy Discovering Soil and Life in the Tree Canopy Canopy Biodiversity: Salamanders and Aquatic Copepods Canopy Soils: Nutrient Richness vs. Forest Floor Scarcity Sponsors: MoMA PS1, Optum, Home Depot, and Audi Trees Growing Roots in Canopy Soil for Nutrients Fractal Forests: Trees Growing on Trees Credits, Acknowledgments, and Closing Ads
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