Traditional Boundaries : Defining Issues (Vulnerability)

Field boundaries suffer from various decay processes that can be summarised as follows:

Main Categories Processes Key Variables	Processes	Key Variables
Geomorphic	Soil Creep Solification Talus Creep Rockslide Mudflow Fluvial	Relationship to slope Nature of Substrate bed-rock alluvium glacial drift peat Vegetation Cover
Climatic	Wind Snowfall Freeze-thaw Desiccation	Microclimate Aspect Nature of Substrate bed-rock alluvium glacial drift peat
Biological	Burrow Activity Sheep jumping Humans climbing Tree disturbance Management history	Earthworm density Rabbit and mole density Sheep behaviour Stocking rates Proximity of trees to walls Value of wall to land manager Vegetation cover Nature of Substrate bed-rock alluvium glacial drift peat