A fellfield or fell field comprises the environment of a slope, usually alpine or tundra, where the dynamics of frost (freeze and thaw cycles) and of wind give rise to characteristic plant forms in scree interstices.

The freeze-thaw cycles tend to push plants out of the soil. In addition, the high porosity of the soil makes a fellfield is a difficult place for plants to grow.

External Link and Source

http://www.sun.ac.za/consecol/students/leroux/leroux.html