‘Tropical Temperate
Forest’ is a new term
used in forest typology. It denotes a rare type of forest found
in high altitude ranges of South Western Ghats
lying above 1500MSL. This forest is popularly known as ‘Sholas’ locally. The peculiarities
of Shola are identified at least from ‘Sangam Age’ of South
India (2200 BP). Technically this forest belongs to ‘Tropical Montane
Forest’ represented to the continents
of Asia, Africa & S. America. The Southern
Wet Temperate forest or Shola is distributed in Nilgiris (north of Palakkad
gap, between Mettupalayam and Wayanad plateau.), Anamalais (between
Nelliyampathy Hills and Periyar delta), Palany Hills (Eastward offshoot of Ghats from Anamudi to Kodaikanal), and Agasthyar Hills.
Terminology
The name ‘Shola’ denoting
southern wet temperate forest, is derived from ancient Tamil word ‘Cholai’
which is used both Malayalam and Tamil languages. ‘Chola’ means thickets of
wooded area with a stream. This term is widely used in the high altitude areas
of South Western Ghats. The ancient migration
of people from eastward plateau of the Ghats
in Anamalais and Palani is recoganised with prehistoric cave arts and
megaliths. These relics found in sholas and adjourned areas, reveal the fact
that ancient migration continues through ages from prehistoric period to
historic period.
The
shola forest is of two types. One which denote Montane
forests (southern hilltop tropical evergreen forests) exist between 1300-1800 m
above MSL and the other denote montane wet temperate forests (southern montane
wet temperate forests) exist 1800 m above MSL and are found in pockets' supporting
stunted trees.
Southern
Hill Top Tropical Evergreen forest-
Features: Close affinity with tropical evergreen forest.
Due to its presents in mountains above 1300MSL in this forest, temperature
seldom exceeds 20 dc. Rainfall is heavy; sometimes records more than 6000mm.
Humidity is above 80%. Unlike tropical evergreen forest , the trees are not
taller and seldom attain more than 25mtrs and the spread of crowns are bigger
than evergreen trees. Animals of the tropical evergreen and moist deciduous forest
are adapted to this forest and almost all of these animals are found in this
forest. Like wise many species restricted to ‘tropical temperate’ forest are
also found in this forest (Eg.Nilgiri Marten). It is same with bird diversity,
that these forests hold both species from TTF and TEF.
Ecological
importance of this forest is its support to the water runoff to the rivers of
Kerala. Though it is less than 1% of the total forest area of the ghats , it
support to maintain the water level of rivers through out the year. This
forests faced mass destruction from plantations and reduced to certain
protected forest areas.
Best
seen at : Munnar (Pampadumchola, Mannavanchola, Idivaraichola, Pullaradichola, Manthanshola, Chokkanad shola,), Anamalais
(Attakatty shola, Kadanpara shola, Pampumalai shola, Attumalai shola etc.)
Palani hills (Kukkal shola, Periyashola etcc), Nilgiris, Pathanamthitta ( Ranni
forest and along Periyar South east), Agasthyar hills, Athirumalai, Wayanad
(Garudapara, Bhramagir hills) etc.
Southern montane wet temperate forest: This
type of vegetation occurred in mountain folding and cliffs in upper reaches of
mountains. This type of forests is mostly found in Anamalais, Nilgiri and
Palani hills. Temperature seldom exceeds 15dc, and rainfalls exceeds 4000 mm.
Humidity is 80% to 100%.
Peculiarity
of this forest is its short and stunted trees and growth. This forest is
interspersed with high grassland. The vegetation is controlled by wind and
mist. The grassland is an integral part of this forest and formed a single
biome- shola-grassland. Many species of animals, birds and plants are
restricted to this forest. Eg. Nilgiri marten, Nilgir tahr, Clawless otter,
Door mouse etc.
Best seen at : Eravikulam
National Park, Grassland National Park,
Sisapara and Niliri hills, Palani hills, Kundah hills etc.