SUB MONTANE
FORESTS
Lower
Montane rain forest characterizes the vegetation types of the wet
zone at mid elevation between 1000 and 1500 mm without any regular
dry season.
Sub-Montane
forests consist of two tree layers as in the case of Montane forest,
but the canopy reaches higher to around 15 to 20 m, occasionally
with some emergent trees. It also contains shrubs herbs.
This represents
a transitional (an eco-tone) between tropical lowland forests and
Montane forests. Thus it has its own unique mix of flora and fauna
as well as endemic species found in neither of the above mentioned
two forest types.
The degree
of endemism is very high and consist of species, which are not found
in any other ecosystem. Peak wilderness sanctuary is a classic example
of a sub-montane forests.
Sub-montane
forests provide catchment protection of major rivers by minimizing
soil erosion. Thus these forests are also considered essential in
preventing landslides.
Today only
around 69,000 ha. Of these forests remain intact. Cardamom cultivation,
gemming, illicit felling of timber and heavy encroachments result
in a severe pressure on these forests.
Sub-montane
forests are probably the most threatened ecosystem in the island.
|