Vegetation of the Central Plateau

As might be expected in an upland region, the distribution of plant communities is determined largely by low temperatures, in particular by the degree and frequency of frosts below -5°C, glazing storms, and ice-bearing winds.
The most significant single index which is readily available is probably the mean summer temperature. A mean temperature of 10°C for the warmest month has been accepted as the indicator of the tree line (Daubenmire 1954). Most of the Central Plateau above 1040m is thus in this category.