Negligible soil erosion in a burned mountain watershed, Canadian Rockies: field and modelling investigations considering the role of duff

A high-intensity crown fire in Kootenay National Park, British Columbia, resulted in negligible soil erosion (10–1 to 100 t ha⁻¹) in the immediate post-wildfire years, contrary to documented trends. The study attributes this to remnant duff—a layer of decomposed organic material—that persisted after the fire. Duff acts as a hydrological buffer, absorbing rainfall and preventing overland flow, while also physically protecting soil from erosion. Using the Green–Ampt model, researchers demonstrated that duff's high porosity and water storage capacity effectively mitigate erosional impacts during rainstorms. This finding challenges assumptions about post-wildfire erosion dynamics in subalpine forests and underscores the role of organic layers in stabilizing watersheds.

Martin, Y. E., Johnson, E. A., Gallaway, J. M., & Chaikina, O. (2011). Negligible soil erosion in a burned mountain watershed, Canadian Rockies: field and modelling investigations considering the role of duff. Earth Surface Processes and Landforms, 36(15), 2097–2113. Portico. https://doi.org/10.1002/esp.2236