Tuolumne Meadows Soil Carbon Declines After Past Grazing
Research into Yosemite National Park reveals that historical sheep grazing continues to cause soil carbon loss.
Updated on Oct. 24, 2026 in National Parks
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Between 2017 and 2019, researchers found that Tuolumne Meadows in Yosemite National Park loses 1.3 percent of its soil carbon annually. The loss is linked to heavy sheep grazing that occurred in the area during the late 19th and early 20th centuries.
Why it matters
The study highlights the long-term environmental degradation caused by historical grazing that removed deep-rooted sedge plants. The resulting bare soil contributes to continued carbon emissions, complicating efforts to restore the meadow ecosystem.
The study site at 8,500 feet elevation shows that the top 4 inches of soil contain 20 percent carbon by weight, though 20 percent of the area remains bare. Researchers planted 40,000 native Carex scopulorum seedlings to combat erosion and carbon loss.
The players
Yosemite National Park
This protected area in the Sierra Nevada serves as a major destination for 4 million annual visitors.
Carex scopulorum
This native sedge species was the focus of planting efforts to help restore the degraded meadow soil.
The details
Heavy 19th-century sheep grazing removed critical vegetation, while local voles and ground squirrels currently prevent natural revegetation of bare patches. Restoration experts estimate that returning the meadow to a healthy carbon-gaining state will take between 25 and 50 years of intervention.
Timeline
1870: Between 12,000 and 15,000 sheep grazed in Tuolumne Meadows.
1890: Yosemite National Park was officially established.
1905: Illegal sheep grazing within the park boundaries ended.
2016-2018: Researchers planted 40,000 native sedge seedlings in the meadow.
2017-2019: Scientific teams measured meadow carbon dioxide flux.
Travel Outlook
The study contextualizes the enduring ecological footprint of early land use relative to the 1890 establishment of Yosemite National Park. It serves as a reminder that management practices from over a century ago continue to influence the landscape seen by millions of modern visitors.
While restoration efforts are long-term, visitors should note that areas of the meadow remain sensitive to foot traffic due to bare soil and ongoing planting projects. Keeping to marked trails is essential to support the survival of the 40,000 seedlings recently introduced to the study site.
The takeaway
Restoring high-altitude meadows requires decades of commitment to counteract historical damage from overgrazing. Gardeners and conservationists can learn from this that establishing deep-rooted native plants like sedge is critical for preventing soil erosion and maintaining carbon storage.
Further reading
For more information on preservation efforts, visit the National Parks section.
Source note: This article includes information reported by Earth.
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