How does texture influence infiltration and erosion risk in arid-semiarid rangelands?

• A. Coarse textures infiltrate quickly but are prone to wind erosion when bare; fine textures infiltrate slowly but can crust and erode if vegetation cover is poor.
• B. Fine textures infiltrate quickly but never erode under poor cover.
• C. Coarse textures retain water best and never erode.
• D. Texture has no impact on erosion.

Answer: (A)

Texture sets how water and soil particles move and hold together on the surface, which drives both infiltration and erosion risk in arid-semiarid rangelands. Coarse-textured surfaces, like sands, have large pores that let water infiltrate quickly when the surface isn’t crusted. But that same loose surface becomes highly vulnerable to wind erosion when bare—strong winds can lift and move the unfixed grains more easily than finer soils.

Fine-textured surfaces, such as silts and clays, have very small pores, so water moves in slowly and infiltration can stay low, especially after rainfall dries and air temperature rises. These soils tend to form a surface crust, which can further reduce infiltration and promote runoff. If vegetation cover is poor, this crusted surface is exposed and erosion risk increases because overland flow can detach and remove material, and the crust can be broken up, accelerating erosion.

So, the best answer reflects the two-way influence: coarse textures infiltrate quickly but are prone to wind erosion when bare; fine textures infiltrate slowly and can crust and erode when vegetation cover is poor.