The roots' expansion stabilizes the slope and draws water into it. The slope will determine if adding vegetation makes the slope more or less stable.
By bolstering roots and altering the saturated soil regime, vegetation stabilizes slopes and prevents erosion. The interlocking and long fibrous binders that plant roots provide within a soil mass are shown by research to anchor through the soil and cross weakened zones to more stable soil.
Background. The physical protection of soil against erosion is provided by plants' roots and above-ground vegetation, which play a key role in soil stabilization.
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