This is called Altitudinal zonation.
The region is geologically young and shows high Altitudinal variation.
Thimphu is the third highest capital in the world by altitude and
is spread over an Altitudinal range between 2,248 metres(7,375 feet) and 2,648 metres(8,688 feet).
Zanskar is one of the coldest arid inhabited highlands in the world,
situated within an Altitudinal range of 3,500 m to 6,478 m
above mean sea level.
Zanskar is one among the cold arid inhabited highlands of the world,
lying within an Altitudinal range of 3500 m to 6478 m
above mean sea level.
Some plants and animals found in Altitudinal zones tend to become isolated since the conditions above
and below a particular zone will be inhospitable and thus constrain their movements or dispersal.
India, for the most part, lies within the Indomalaya ecozone, with the upper reaches of the Himalayas forming part of the Palearctic ecozone;
the contours of 2000 to 2500m are considered to be the Altitudinal boundary between the Indo-Malayan and Palearctic zones.
Inside this wildlife sanctuary, the primary biomes corresponding to the ecozone are: Sino-Himalayan Temperate Forest of the Eastern Himalayan broadleaf forests Biome 7 Sino-Himalayan Subtropical Forest of the Himalayan subtropical broadleaf forests Biome 8 Indo-Chinese Tropical Moist Forest of the Himalayan subtropical pine
forests Biome 9 All of these are typical forest type of foothills of the Bhutan- Nepal- India hilly region between Altitudinal range 1000 m to 3,600 m.