Silty soils may protect against carbon loss during drought, study finds.
Soil texture affects how well organic matter breaks down in the soil by controlling moisture levels. In a field experiment, researchers found that silt loam soil with higher moisture content had faster organic matter decomposition during droughts compared to sandy soil. Even though sandy soil had less organic matter breakdown initially, silt loam soil lost more organic matter over time. This suggests that in the future, sandy soils might retain more organic matter during frequent droughts than finer textured soils.