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Future nitrogen availability and its effect on carbon sequestration in Northern Eurasia.

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Nitrogen availability significantly impacts forest carbon storage in Northern Eurasia. Land-use change and permafrost thaw are key drivers influencing future carbon sequestration under global change scenarios.

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Area of Science:

  • Ecology
  • Climate Change Science
  • Forestry

Background:

  • Nitrogen availability is a critical factor controlling forest carbon storage in Northern Eurasia.
  • Global change drivers like permafrost degradation, nitrogen deposition, and land-use legacy are altering nitrogen dynamics in the region.

Purpose of the Study:

  • To investigate the impact of altered nitrogen availability on forest vegetation carbon storage in Northern Eurasia throughout the 21st century.
  • To analyze these impacts under two Intergovernmental Panel on Climate Change (IPCC) scenarios: RCP4.5 and RCP8.5.

Main Methods:

  • Utilized a process-based ecosystem model to simulate forest carbon dynamics.
  • Incorporated three key factors affecting nitrogen availability: permafrost degradation, atmospheric nitrogen deposition, and land-use legacy.
  • Evaluated carbon storage changes in forest vegetation under different climate change scenarios.

Main Results:

  • Under RCP4.5, enhanced nitrogen availability led to a 27.8 Pg C increase in tree carbon storage, with land-use legacy being the dominant factor.
  • Under RCP8.5, enhanced nitrogen availability resulted in a 13.4 Pg C increase in tree carbon storage, with permafrost degradation being the most influential factor.
  • Observed complex spatial and temporal patterns in regional carbon storage.

Conclusions:

  • Carbon-nitrogen interactions are crucial for understanding the effects of global change on forest ecosystems.
  • Land-use legacy and permafrost degradation are significant drivers of future carbon storage in Northern Eurasian forests.
  • Considering these factors is essential for accurate regional and sub-regional impact assessments of global change policies.