Carbon Cycle in the Alaskan Tundra

Why is biomass carbon storage low in the tundra?

Low temperatures, frozen ground, and limited nutrients restrict plant growth and NPP.

What is the main carbon store in the tundra?

Carbon trapped in partly decomposed organic matter frozen in permafrost — locked away for up to 500,000 years.

How does temperature affect carbon fluxes in the tundra?

Cold, waterlogged soils slow decomposition and respiration, limiting CO₂ release.

How does geology affect the tundra’s carbon cycle?

Permafrost and low-porosity rocks prevent deep carbon exchange; most carbon remains stored near the surface.

What is the effect of climate change on tundra carbon stores?

Thawing permafrost releases CO₂ and methane, turning the tundra from a carbon sink into a potential carbon source.