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Shola
Sholas are a local name for patches of stunted tropical montane forest found in valleys amid rolling grassland in the higher montane regions of South India. These patches of shola forest are found mainly in the valleys and are usually separated from one another by undulating montane grassland. The shola and grassland together form the shola-grassland complex or mosaic. The word 'shola' is probably derived from the Tamil language word cÕlai (சோலை) meaning grove. The shola-forest and grassland complex has been described as a climatic climax vegetation with forest regeneration and expansion restricted by climatic conditions such as frost or soil characteristics while others have suggested that it may have anthropogenic origins in the burning and removal of forests by early herders and shifting agriculturists.
==Distribution and origin==
Shola forests are found in the higher altitude hill regions of the Nilgiris, Kanyakumari district, the Western Ghats and associated ranges in the states of Karnataka, Kerala and Tamil Nadu. Although generally said to occur above 2000 meters above sea level, shola forests can be found at 1600 meters elevation in many hill ranges (e.g. Biligiriranga Hills).
The origin of the shola forest and grassland complex has been the subject of scientific debate. Some early researchers suggested that the floristic composition represents a stable final state or climax vegetation. This stability being maintained by climatic conditions such as frost which allow the grass to grow but kill off any forest seedlings. Others have suggested that the grassland may have been created and maintained by early pastoralists and point out that fire has a major role in the maintenance of the grassland. There is evidence for both and several features of the forest trees and the grasslands have been considered and debated. Pollen analysis from bogs in the Nilgiris suggest that the complex of grassland and forest existed 35,000 years ago, long before human impact began. Long term studies on the dynamic processes of vegetation change continue.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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