How does overgrazing damage grassland vegetation and soil?

Overgrazing is a chronic issue in rangeland management that causes significant degradation to both vegetation and soil.1

Impact on Vegetation

Overgrazing reduces forage production and alters the botanical composition of plant communities. When livestock consume plants down to the ground, they remove tissues necessary for photosynthesis, which inhibits plant growth. Furthermore, grazing pressure often favors inedible species, such as cacti or shrubs like honey mesquite, which can form thickets that prevent native grasses from recolonizing the area.12

Impact on Soil

Soil damage is often considered the most critical consequence of overgrazing. The primary mechanisms include:21
* Trampling: Livestock movement destroys plant roots that bind the soil together and compacts the earth, which hinders future root development.21
* Erosion: The loss of vegetation cover and root structure leaves soil vulnerable to erosion. Rainwater flowing along animal paths can form rivulets that wash away unprotected topsoil.132
* Degradation: Overgrazing exposes soil to sealing and baking, which reduces water infiltration and increases runoff and flooding.1