Beef cattle production impacts soil organic carbon storage

Area of Science:

• Agricultural Science
• Environmental Science
• Soil Science

Background:

• Beef cattle production relies heavily on grazing, influencing land use and soil organic carbon (SOC) stocks.
• Changes in beef cattle populations directly affect the proportion of perennial forage versus annual crops in Canada.

Purpose of the Study:

• To investigate the historical relationship between beef cattle populations and net changes in SOC.
• To quantify the impact of land use conversion driven by cattle populations on SOC dynamics.

Main Methods:

• Analysis of historical data correlating beef cattle populations with estimated SOC changes.
• Examination of land use conversion from perennial crops to annual crops.

Main Results:

• A strong negative linear relationship was found between beef cattle numbers and SOC changes, indicating SOC loss with declining cattle populations.
• Land use conversion associated with declining cattle populations results in annual carbon loss.
• This carbon loss is substantial, equivalent to approximately 62% of combined enteric and manure greenhouse gas emissions.

Conclusions:

• Beef cattle population dynamics significantly influence SOC stocks through land use changes.
• Integrated analysis of land use conversion and SOC is crucial for accurate environmental footprint assessment of beef production.
• Strategies supporting perennial forage maintenance are vital for mitigating SOC loss in Canadian beef systems.