What can mottles indicate about soil?

Mottles in soil are indicative of fluctuating water levels, which are a result of seasonally saturated conditions. These mottles typically appear as spots or blotches of differing colors within the soil, often characterized by variations in hue that are related to changes in the availability of oxygen in the soil. When soils are saturated with water, they may become anaerobic, leading to chemical reactions that cause these color changes. Observing these mottles is essential for understanding the hydric conditions of the soil, which ultimately informs decisions regarding drainage and the suitability of the soil for construction or agricultural purposes.

While mottles might imply implications for drainage capabilities or soil type, their primary association is with saturation levels over time and the impact that has on soil color changes. Therefore, identifying mottles serves as a crucial indicator for understanding the hydrological dynamics of a soil profile.