Shifting from a fertilization-dominated to a warming-dominated period

Area of Science:

• Ecology
• Climate Change Science
• Biogeochemistry

Background:

• Ecosystems have historically sequestered carbon, influenced by factors like carbon dioxide and nitrogen fertilization.
• Nutrient constraints, climate change, land use changes, and disturbances can limit carbon sequestration.
• Record high temperatures and droughts are increasingly impacting natural carbon sinks.

Purpose of the Study:

• To investigate the potential slowdown of ecosystem carbon sequestration.
• To analyze the combined effects of nutrient constraints and climate change on carbon sinks.
• To discuss the shift from fertilization-dominated to climate-change-dominated impacts on carbon sequestration.

Main Methods:

• Review of existing scientific literature on carbon sequestration.
• Analysis of trends in climate change indicators (temperature, drought).
• Synthesis of evidence regarding nutrient limitations and land use impacts.

Main Results:

• Fertilization effects on carbon sequestration may saturate or decline in the future.
• Climate change, particularly high temperatures and droughts, is increasingly causing negative impacts on carbon sinks.
• A potential shift is occurring where negative climate impacts may override positive fertilization effects.

Conclusions:

• Emerging nutrient constraints and climate change pose significant risks to future carbon sequestration.
• The balance is shifting, potentially leading to a net release of carbon from ecosystems.
• Understanding these interacting factors is crucial for predicting future climate change trajectories.