How does removing vegetation make slopes more vulnerable to mass movement?

Removing vegetation from slopes significantly increases their vulnerability to mass movement, such as landslides, primarily because it eliminates the stabilizing influence of plant root systems.1

In mountainous or steep terrain, tree roots play a critical role in binding soil particles together, which provides structural integrity to the slope. When this vegetation is cleared—whether through deforestation, logging, or fire—the soil loses this mechanical reinforcement. Without these roots to anchor the earth, the slope becomes susceptible to failure, especially when combined with factors like high rainfall, which can saturate the ground and trigger mass movement.1

Beyond the loss of structural support, the removal of vegetation disrupts natural ecosystem services, such as the regulation of water cycles, which further destabilizes the landscape. Protecting these natural barriers is essential for maintaining slope stability and preventing the catastrophic destruction of homes, fields, and human lives.1