Scientists have identified an extensive network of arbuscular mycorrhizal fungi (AM) that exists just below the Earth’s surface, crucial for the health of 70 percent of plant species. The study, published by the Society for the Protection of Underground Networks (SPUN), reveals that the biomass of these fungi is four to six times greater than that of the human population. If placed end-to-end, their pathways would span approximately 110 quadrillion kilometers, capable of wrapping around the planet 2.7 trillion times. The research, which analyzed over 16,000 soil samples across nine biomes, found the densest fungal structures in grasslands, particularly in South Sudan, the Everglades, and the Tibetan plateau. This study marks the first attempt to comprehensively map the density and extent of AM networks, emphasizing their critical role in nutrient transport and carbon sequestration.
Why It Matters
Arbuscular mycorrhizal fungi have been integral to terrestrial ecosystems for up to 500 million years, forming symbiotic relationships with plant roots that enhance nutrient absorption. This interaction enables plants to access nutrients over a significantly larger area than their roots alone could reach, while the fungi gain carbon in return. The study highlights the importance of understanding these underground networks, especially in the context of climate change and food security, as they play a vital role in regulating ecosystems and carbon cycling. Expanded research into underrepresented biomes could further illuminate the ecological significance of these fungal networks.
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