Turpan Depression
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The Turpan Depression or Turfan Depression, is a fault-bounded trough located around and south of the city-
oasis In ecology, an oasis (; : oases ) is a fertile area of a desert or semi-desert environmentTurpan Turpan () or Turfan ( zh, s=吐鲁番) is a prefecture-level city located in the east of the Autonomous regions of China, autonomous region of Xinjiang, China. It has an area of and a population of 693,988 (2020). The historical center of the ...
, in the Xinjiang Autonomous Region in far
Western China Western China ( zh, s=中国西部, l=, labels=no or zh, s=华西, l=, labels=no) is the west of China. It consists of Southwestern China and Northwestern China. In the definition of the Chinese government, Western China covers six provinces ...
, about southeast of the regional capital
Ürümqi Ürümqi, , is the capital of the Xinjiang, Xinjiang Uyghur Autonomous Region in Northwestern China. With a census population of 4 million in 2020, Ürümqi is the second-largest city in China's northwestern interior after Xi'an, also the ...
. It includes Lake Ayding, , the second or third lowest depression on
Earth Earth is the third planet from the Sun and the only astronomical object known to Planetary habitability, harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all ...
. By some measures, it is also the hottest and driest area in China during the summer.


Geology and relief

The Turpan Basin is a fault-bounded trough located in the eastern part of the
Tian Shan The Tian Shan, also known as the Tengri Tagh or Tengir-Too, meaning the "Mountains of God/Heaven", is a large system of mountain ranges in Central Asia. The highest peak is Jengish Chokusu at high and located in Kyrgyzstan. Its lowest point is ...
. It covers an area of . The surrounding mountain ranges are: the central Tian Shan in the west, the
Bogda Shan The Bogda Shan (; zh, s=博格达山, t=博格達山, p=Bógédá shān) range is part of the Eastern Tian Shan mountains and located in Xinjiang, some 60 km east of Ürümqi Ürümqi, , is the capital of the Xinjiang, Xinjiang Uy ...
in the north-west, the Haerlike Shan in the north-west, and the Jueluotage Shan in the south. Beyond the surrounding mountain ranges lie the
Junggar Basin The Junggar Basin (), also known as the Dzungarian Basin or Zungarian Basin, is one of the largest sedimentary basins in Northwest China. It is located in Dzungaria in northern Xinjiang, and enclosed by the Tarbagatai Mountains of Kazakhstan in t ...
in the north and the
Tarim Basin The Tarim Basin is an endorheic basin in Xinjiang, Northwestern China occupying an area of about and one of the largest basins in Northwest China.Chen, Yaning, et al. "Regional climate change and its effects on river runoff in the Tarim Basin, Ch ...
in the south. Some geographers also use the term Turpan-Hami Basin, which is understood as including the Turpan Depression along with the Hami Depression (located to the east of the Turpan Depression, and to the southwest of the city of
Hami Hami ( zh, c=哈密) or Kumul () is a prefecture-level city in eastern Xinjiang, China. It is well known for sweet Hami melons. In early 2016, the former Hami county-level city merged with Hami Prefecture to form the Hami prefecture-level city ...
) and the Liaodong Uplift separating the two depressions. A source using this terminology gave the area of the Turpan Depression proper as , that of the Hami Depression as , and for the entire Turpan-Hami Basin, as . The Turpan Basin formed in a shear zone during the
Late Permian Late or LATE may refer to: Everyday usage * Tardy, or late, not being on time * Late (or the late) may refer to a person who is dead Music * ''Late'' (The 77s album), 2000 * Late (Alvin Batiste album), 1993 * Late!, a pseudonym used by Dave Groh ...
due to motion between the East European and the Angaran craton. It was subsequently deformed by the collision of the
Indian Plate The Indian plate (or India plate) is or was a minor tectonic plate straddling the equator in the Eastern Hemisphere. Originally a part of the ancient continent of Gondwana, the Indian plate broke away from the other fragments of Gondwana an ...
and Eurasian Plate in the
Cenozoic The Cenozoic Era ( ; ) is Earth's current geological era, representing the last 66million years of Earth's history. It is characterized by the dominance of mammals, insects, birds and angiosperms (flowering plants). It is the latest of three g ...
. In the latter deformation, a thrust fault belt running from east to west, the Flaming Mountains, was formed in the center of the basin. The Flaming Mountains are long and wide; the highest peak reaches an elevation of above sea level. The Turfan volcano is located near Turpan. Also in the center of the basin lies the Ayding Lake (Moonlight Lake) which has an elevation of below sea level, the sixth lowest exposed elevation on the Earth's land surface. It is the lowest surface point in China. The Shihongtan
uranium Uranium is a chemical element; it has chemical symbol, symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. Ura ...
ore deposit is located at the southwestern margin of the Turpan Depression, some south-southwest from Turpan City.


History of human settlement

The ancient city of Gaochang was a key point on the ancient
Silk Road The Silk Road was a network of Asian trade routes active from the second century BCE until the mid-15th century. Spanning over , it played a central role in facilitating economic, cultural, political, and religious interactions between the ...
and dates back to the 1st century BC. It was burnt down in wars in the 14th century. The Bezeklik Thousand Buddha Caves, which are located in the Flaming Mountains' Mutou Valley, about east of the city of Turpan, have been hewn into the rock from the
Tang dynasty The Tang dynasty (, ; zh, c=唐朝), or the Tang Empire, was an Dynasties of China, imperial dynasty of China that ruled from 618 to 907, with an Wu Zhou, interregnum between 690 and 705. It was preceded by the Sui dynasty and followed ...
–era up to the time of the
Yuan dynasty The Yuan dynasty ( ; zh, c=元朝, p=Yuáncháo), officially the Great Yuan (; Mongolian language, Mongolian: , , literally 'Great Yuan State'), was a Mongol-led imperial dynasty of China and a successor state to the Mongol Empire after Div ...
(13th century). The caves are famous for their murals, which can still be found in about 40 of the 77 known caves. The desert climate has favored preservation of the content of the Astana-Karakhoja ancient tombs, which are located about 6 km from the ancient city of Gaochang. The tombs are the burial place for nobles, officials, and others who were interred there from the times of the Western Jin dynasty until the middle of the Tang dynasty era. The modern city of
Turpan Turpan () or Turfan ( zh, s=吐鲁番) is a prefecture-level city located in the east of the Autonomous regions of China, autonomous region of Xinjiang, China. It has an area of and a population of 693,988 (2020). The historical center of the ...
has a population of 242,000, of whom 71% are Uyghur. For water, the city relies on wells and traditional '' karez'' (meaning "well" in the local
Uyghur language Uyghur or Uighur (; , , or , , ), formerly known as Turki or Eastern Turki, is a Turkic languages, Turkic language with 8 to 13 million speakers (), spoken primarily by the Uyghur people in the Xinjiang Uyghur Autonomous Region of Western ...
).


Climate

The Turpan Basin has a harsh, continental
desert climate The desert climate or arid climate (in the Köppen climate classification ''BWh'' and ''BWk'') is a dry climate sub-type in which there is a severe excess of evaporation over precipitation. The typically bald, rocky, or sandy surfaces in desert ...
(Koppen ''BWk'') in which the precipitation is far less than the potential evaporation. At Turpan City, July is the hottest month with a 24-hour average temperature of and January the coldest with a 24-hour average temperature of . Monthly rainfall is highest in June, at and lowest in February and April, at . The annual average precipitation is only , falling on only 13 days per year. In contrast to this, the potential annual evaporation rate reaches . Because of its climate, the area is sometimes counted as one of the ''Furnaces of China'', although the locations included under this heading vary.


Vegetation and agriculture

On the shores of Aydingkol Lake, reeds, tamarisks, saxauls, as well as other shrubs and weeds can be found. Away from sources of water, the Turpan Basin is not covered by vegetation. Consequently, agriculture is limited to oasis and depends on a sophisticated irrigation system known as the '' Karez System''. The irrigation water comes from the surrounding mountain ranges, in particular from the annual melting of the snow. The Karez System consists of wells, underground channels, ground canals, and small reservoirs, which use the natural slope of the terrain to sustain the water flow and guide the water right to the plants while minimizing evaporation all along the way. The historical record of the system extends back to the
Han dynasty The Han dynasty was an Dynasties of China, imperial dynasty of China (202 BC9 AD, 25–220 AD) established by Liu Bang and ruled by the House of Liu. The dynasty was preceded by the short-lived Qin dynasty (221–206 BC ...
. The number of Karez systems in the area is slightly below one thousand and the total length of the canals is about in length. The Karez System is therefore considered one of the three great ancient projects in China along with the
Great Wall The Great Wall of China (, literally "ten thousand Li (unit), ''li'' long wall") is a series of fortifications in China. They were built across the historical northern borders of ancient Chinese states and Imperial China as protection agains ...
and the Grand Canal. Recently, development of groundwater through tubewells has led to a general fall in water tables, and many karez systems have failed. Farming in the Turpan Basin is particularly famous for its fruit. Because of the dry and hot conditions, the fruits grown in the depression have very high concentrations of sugar. They are traditionally processed by drying in open drying barns. The cultivated fruit include:
mulberry ''Morus'', a genus of flowering plants in the family Moraceae, consists of 19 species of deciduous trees commonly known as mulberries, growing wild and under cultivation in many temperate world regions. Generally, the genus has 64 subordinat ...
,
peach The peach (''Prunus persica'') is a deciduous tree first domesticated and Agriculture, cultivated in China. It bears edible juicy fruits with various characteristics, most called peaches and the glossy-skinned, non-fuzzy varieties called necta ...
,
apricot An apricot (, ) is a fruit, or the tree that bears the fruit, of several species in the genus ''Prunus''. Usually an apricot is from the species '' P. armeniaca'', but the fruits of the other species in ''Prunus'' sect. ''Armeniaca'' are also ...
,
apple An apple is a round, edible fruit produced by an apple tree (''Malus'' spp.). Fruit trees of the orchard or domestic apple (''Malus domestica''), the most widely grown in the genus, are agriculture, cultivated worldwide. The tree originated ...
,
pomegranate The pomegranate (''Punica granatum'') is a fruit-bearing deciduous shrub in the family Lythraceae, subfamily Punica, Punicoideae, that grows between tall. Rich in symbolic and mythological associations in many cultures, it is thought to have o ...
,
pear Pears are fruits produced and consumed around the world, growing on a tree and harvested in late summer into mid-autumn. The pear tree and shrub are a species of genus ''Pyrus'' , in the Family (biology), family Rosaceae, bearing the Pome, po ...
, fig,
walnut A walnut is the edible seed of any tree of the genus '' Juglans'' (family Juglandaceae), particularly the Persian or English walnut, '' Juglans regia''. They are accessory fruit because the outer covering of the fruit is technically an i ...
, as well as
grape A grape is a fruit, botanically a berry, of the deciduous woody vines of the flowering plant genus ''Vitis''. Grapes are a non- climacteric type of fruit, generally occurring in clusters. The cultivation of grapes began approximately 8,0 ...
s,
watermelon The watermelon (''Citrullus lanatus'') is a species of flowering plant in the family Cucurbitaceae, that has a large, edible fruit. It is a Glossary of botanical terms#scandent, scrambling and trailing vine-like plant, and is plant breeding ...
s and
true melon ''Cucumis melo'', also known as melon, is a species of ''Cucumis'' that has been developed into many cultivated varieties. The fruit is a pepo. The flesh is either sweet or bland, with or without an aroma, and the rind can be smooth (such as ho ...
s. Among the fruit, the grapes stand out: more than 100 varieties of grape are cultivated in the area and it accounts for 90% of China's seedless grape crop. Other specialty agricultural products of the region are Donghu Hami melons and long-staple cotton.


Sources

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Notes


External links


Climate data
{{Authority control Turpan Landforms of China Depressions (geology) Landforms of Xinjiang