The Central Tibetan Plateau alpine steppe
ecoregion
An ecoregion (ecological region) or ecozone (ecological zone) is an ecologically and geographically defined area that is smaller than a bioregion, which in turn is smaller than a biogeographic realm. Ecoregions cover relatively large areas of ...
(WWF ID: PA1002) covers the high alpine plateau that stretches over across the
Tibetan Plateau
The Tibetan Plateau (, also known as the Qinghai–Tibet Plateau or the Qing–Zang Plateau () or as the Himalayan Plateau in India, is a vast elevated plateau located at the intersection of Central, South and East Asia covering most of the ...
to
Qinghai Lake
Qinghai Lake or Ch'inghai Lake, also known by other names, is the largest lake in China. Located in an endorheic basin in Qinghai Province, to which it gave its name, Qinghai Lake is classified as an alkaline salt lake. The lake has fluctuate ...
in
China. Because of the high altitude—much it over —the region is a cold, arid desert that is only 20% covered with steppe and meadow vegetation. The area has been relatively free from human development due to the hostile climate and unsuitability for agriculture. The ecosystem is relatively intact, and supports herds of wild antelope, sheep, deer, and gazelles.
Location and description
Towards the west, the ecoregion is on the southern
Changtang
The Changtang (alternatively spelled Changthang or Qangtang) is a part of the high altitude Tibetan Plateau in western and northern Tibet extending into the southern edges of Xinjiang as well as southeastern Ladakh, India, with vast highlands and g ...
plateau, a part of the greater Qinghai-Tibet Plateau. This area is a high basin between the even higher
Kunlun
The Kunlun Mountains ( zh, s=昆仑山, t=崑崙山, p=Kūnlún Shān, ; ug, كۇئېنلۇن تاغ تىزمىسى / قۇرۇم تاغ تىزمىسى ) constitute one of the longest mountain chains in Asia, extending for more than . In the bro ...
Mountains to the north and the
Himalayas
The Himalayas, or Himalaya (; ; ), is a mountain range in Asia, separating the plains of the Indian subcontinent from the Tibetan Plateau. The range has some of the planet's highest peaks, including the very highest, Mount Everest. Over 10 ...
to the south. The plateau tilts gently down towards the southeast, with elevations of 6,000 meters on the Changtang in the northwest to 3,200 meters at Qingai Lake in
Qinghai
Qinghai (; alternately romanized as Tsinghai, Ch'inghai), also known as Kokonor, is a landlocked province in the northwest of the People's Republic of China. It is the fourth largest province of China by area and has the third smallest po ...
Province. The terrain is generally rolling plains. At wide intervals are shallow, brackish lakes.
Climate
The climate of most of the ecoregion is ''
Tundra climate
The tundra climate is a polar climate sub-type located in high latitudes and high mountains. undra climate https://www.britannica.com/science/tundra-climateThe Editors of Encyclopaedia Britannica, 2019 It is classified as ET according to Köppen ...
'' (
Köppen climate classification
The Köppen climate classification is one of the most widely used climate classification systems. It was first published by German-Russian climatologist Wladimir Köppen (1846–1940) in 1884, with several later modifications by Köppen, notabl ...
''ET''), characterized as a climate in which at least one month has an average temperature high enough to melt snow (), but no month with an average temperature over ().
Precipitation ranges from 400 mm/year in the northwest to 200 mm/year in the southeast.
Flora and fauna
Vegetation zones in the region are greatly affected by elevation and precipitation, but are generally sparsely covered. Precipitation controls which alpine zones will have meadow, steppe, or cold desert vegetation Higher steppe elevations support sedges (''
Carex
''Carex'' is a vast genus of more than 2,000 species of grass-like plants in the family Cyperaceae, commonly known as sedges (or seg, in older books). Other members of the family Cyperaceae are also called sedges, however those of genus ''Carex'' ...
''), with purple feathergrass (''
Stipa
''Stipa'' is a genus of around 300 large perennial hermaphroditic grasses collectively known as feather grass, needle grass, and spear grass. They are placed in the subfamily Pooideae and the tribe Stipeae, which also contains many species for ...
purpurea'') increasing in lower altitudes. Wetter areas will support
cushion plants
A cushion plant is a compact, low-growing, mat-forming plant that is found in alpine, subalpine, arctic, or subarctic environments around the world. The term "cushion" is usually applied to woody plants that grow as spreading mats, are limited in ...
and some woody forbs, but there are no trees on the plateau. Small stands of brush and trees can be found in the low, southern river valleys.
The area supports herds of wild
Tibetan antelope
The Tibetan antelope or chiru (''Pantholops hodgsonii'') (, pronounced ; ) is a medium-sized bovid native to the northeastern Tibetan plateau. Most of the population live within the Chinese border, while some scatter across India and Bhutan in ...
, Chinese blue sheep (
Bharal
The bharal (''Pseudois nayaur''), also called the blue sheep, is a caprine native to the high Himalayas. It is the only member of the genus ''Pseudois.'' It occurs in India, Bhutan, China (in Gansu, Ningxia, Sichuan, Tibet, and Inner Mongolia), ...
), several species of deer, and gazelles.
See also
*
Ecoregions in China
References
{{reflist
Ecoregions of China
Montane grasslands and shrublands
Palearctic ecoregions