After a water erosion event, surface soil is likely to have what change in organic matter content?

Following a water erosion event, surface soil typically experiences a loss of organic matter content. Erosion predominantly removes the uppermost layer of soil, which is rich in organic material due to the accumulation of decomposed plant and animal matter. The physical removal of this layer can lead to a reduced concentration of organic matter in the remaining soil.

As water washes away topsoil, the organic matter, which plays a crucial role in soil health by supporting microbial life, improving soil structure, and enhancing nutrient availability, is lost. Thus, it is expected that after an erosion event, the overall content of organic matter in the surface soil would be lower compared to its state before the event. This change can adversely affect soil quality, fertility, and its ability to support vegetation.