Why does continuous forest cover help prevent erosion on mountain slopes?

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Logging in Borneo — forestry Trucks on a road transporting recently harvested logs near Sabah's border with Kalimantan in Borneo.

Continuous forest cover is essential for preventing erosion on mountain slopes because forests act as both filters and sponges within the hydrologic cycle.1

By maintaining a constant canopy and forest floor, the ecosystem regulates the interception, flow, and storage of water. This system effectively slows the movement of water, preventing the rapid runoff that characterizes sparsely vegetated land. When forests are removed, water sheds swiftly, which can lead to increased soil displacement and sudden rises in river levels.1

In mountainous regions, the guiding principle of resource management is to maintain this continual cover, often through techniques like single-stem harvesting. This approach ensures that the soil remains protected by vegetation, preserving the stability of the slopes and the quality of the watershed.1