Grassland Carbon Sequestration Projected to Decline
Reduced plant diversity could cut carbon absorption by 11 billion tonnes annually by 2050.
Updated on Oct. 13, 2026 in Environmental
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Should nations prioritize maintaining plant diversity to ensure future agricultural and climate stability?
A study published in PNAS found that declining plant diversity may lower global grassland carbon dioxide uptake by 15 per cent by mid-century. Researchers used simulations to project that grasslands could absorb 11 billion tonnes less carbon dioxide annually by 2050 under 2 degrees Celsius of warming.
Why it matters
Maintaining diverse ecosystems allows resilient species to compensate for climate-driven declines, which is critical for natural carbon sequestration. This research underscores how shifting plant populations directly impact the global climate mitigation potential of grassland biomes.
Simulations using five general circulation models suggest that while global uptake could fall 15 per cent, some regions like Africa and Spain may see a 20 per cent increase in carbon absorption. In extreme scenarios, sequestration could drop by as much as 50 per cent across specific, less diverse grasslands.
The players
PNAS
The Proceedings of the National Academy of Sciences is a peer-reviewed multidisciplinary journal that publishes high-impact research findings.
The details
Researchers utilized a model categorizing species into competitors, stress-tolerant plants, and ruderals—species that thrive in disturbed environments. By simulating data from 1850 to 2100, the study demonstrated that diversity acts as a buffer by enabling species better suited to changing temperature and precipitation patterns to expand. This process helps maintain productivity, whereas simplified plant communities lack the adaptive breadth to offset local environmental changes.
Timeline
1850 to 2100 represents the total period covered by the ecosystem function simulations.
2050 is the estimated year for the projected 15 per cent decline in carbon absorption.
The Tech Race
This study integrates established general circulation models to refine the role of biotic factors in long-term carbon cycle forecasting. It highlights a critical need to include plant functional diversity within the climate models currently used to evaluate global warming thresholds.
These findings signal potential long-term risks to agricultural productivity, particularly in regions like India and Paraguay. Local land management strategies that prioritize high plant diversity may be required to protect livestock production incomes against future climate volatility.
The takeaway
The study demonstrates that biodiversity is a foundational component of global carbon sequestration capacity. Readers should watch for future reports that refine how specific species-level responses to 2 and 4 degrees Celsius of warming manifest in local grassland management policies.
Further reading
For more research on ecosystem resilience, visit the Environmental section.
Source note: This article includes information reported by Asianet News Network Pvt Ltd.
Live Poll
Should nations prioritize maintaining plant diversity to ensure future agricultural and climate stability?
