How does intensive tillage impact soil carbon sequestration?

How does intensive tillage impact soil carbon sequestration?

• A. It enhances soil carbon storage
• B. It maintains carbon levels in the soil
• C. It can release carbon
• D. It has no effect on carbon levels

Answer: (C)

Intensive tillage significantly disrupts soil structure and the biological processes that are essential for carbon storage in soil. When soil is tilled, it exposes organic matter and soil aggregates to the air, which accelerates the decomposition of organic carbon. Microorganisms break down this organic matter more rapidly in the presence of oxygen, leading to the release of carbon dioxide into the atmosphere. This process can result in a net loss of soil carbon, diminishing the soil's capacity to sequester carbon over time. Additionally, repeated cycles of intensive tillage can lead to soil erosion and further degradation, compounding the loss of carbon stored in the soil. Therefore, the assertion that intensive tillage can release carbon accurately captures the negative impact of this agricultural practice on soil carbon sequestration.

Intensive tillage significantly disrupts soil structure and the biological processes that are essential for carbon storage in soil. When soil is tilled, it exposes organic matter and soil aggregates to the air, which accelerates the decomposition of organic carbon. Microorganisms break down this organic matter more rapidly in the presence of oxygen, leading to the release of carbon dioxide into the atmosphere. This process can result in a net loss of soil carbon, diminishing the soil's capacity to sequester carbon over time. Additionally, repeated cycles of intensive tillage can lead to soil erosion and further degradation, compounding the loss of carbon stored in the soil. Therefore, the assertion that intensive tillage can release carbon accurately captures the negative impact of this agricultural practice on soil carbon sequestration.