Soil organic carbon across scales

Area of Science:

• Soil Science
• Ecology
• Environmental Science

Background:

• Mechanistic understanding of scale effects is vital for interpreting global carbon cycle processes.
• Soil organic carbon (SOC) science requires greater attention to scale for effective policy development.
• Global challenges like climate change necessitate understanding SOC stock changes across scales.

Purpose of the Study:

• To review current understanding of SOC across multiple scales (biosphere to particle).
• To evaluate SOC stabilization processes and science-policy synergy at each scale.
• To examine SOC integration into a soil security framework.

Main Methods:

• Literature review evaluating SOC processes and scale interactions.
• Analysis of science-policy synergy in SOC management.
• Exploration of SOC integration into soil security frameworks.

Main Results:

• SOC processes at biosphere/biome scales are poorly understood; SOC is often viewed as a large-scale carbon pool.
• SOC processes at pedon, aggregate, and particle scales are better understood.
• Landscape scale shows greatest interaction and agricultural modification of SOC processes; policy often overlooks scale interactions.

Conclusions:

• A unified framework integrating SOC processes across a continuum of scales is needed for optimized management.
• Current policy often focuses on the landscape scale, neglecting broader or finer scale influences and impacts.
• Improved understanding and integration of SOC at all scales are essential for sustainable soil use and climate change mitigation.