Replanting grasses builds soil carbon mainly through fungal leftovers
Zhou S, Gong J, Fan K, Degen AA, Wu J
Soil Health
If you've ever wondered why a restored meadow feels richer underfoot than an abandoned field left to nature, the answer is fungi quietly turning fresh grass roots into long-lasting soil carbon.
Scientists compared two ways of healing worn-out grassland on the Tibetan Plateau: actively reseeding it with native grasses versus just removing the damage and letting it recover naturally. After ten years, the reseeded land had roughly twice the soil carbon of the naturally recovering land. Most of that stored carbon wasn't leftover plant material but the remains of fungi that had feasted on the new roots, meaning the fungi themselves became the soil's long-term carbon bank.
Key Findings
Active restoration raised soil organic carbon to 17.8 g/kg (topsoil) and 18.1 g/kg (subsoil), versus only 9.3 and 3.5 g/kg under passive recovery.
Microbe-derived carbon accounted for 31-37% of the soil carbon pool under active restoration, while plant-derived carbon contributed just 1-2%.
Fungal necromass, not preserved plant residue, dominated the stable carbon pool, indicating microbial turnover outpaces direct plant material accumulation.
chevron_right Technical Summary
Actively replanting native grasses on degraded alpine grassland rebuilt soil carbon far better than just letting the land recover on its own, and most of that carbon came from fungi feeding on the new roots, not from plant debris itself.
Abstract Preview
Original paper
Fungal necromass dominates soil organic carbon accrual after decadal active restoration of alpine grassland.
Active (seeding native grasses) and passive (natural recovery via degradation factor removal) restoration practices regulate soil organic carbon (SOC) recovery in degraded grasslands through distin...
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