There are many important geographical boundaries in China, which are often tested in geography disciplines, and the teacher education network has sorted out the relevant knowledge points according to the "Geographical Discipline Knowledge and Teaching Ability", hoping to help the majority of candidates prepare for the exam.
First, the dividing line between annual precipitation and wet and dry conditions
(1) 800 mm annual equal precipitation line: along the Qinling-Huaihe line to the west to the southeast edge of the Qinghai-Tibet Plateau, this line is also the dividing line between humid and semi-humid areas. South of the east of this line, the annual precipitation is generally above 800mm, which is a humid area, and the annual precipitation north of the west of this line is generally below 800mm, which is a semi-humid area.
(2) 400 mm annual equal precipitation line: roughly along the Daxing'anling - Zhangjiakou - Lanzhou - Lhasa line, and then to the east of the Himalayas, this line is also the boundary between semi-humid areas and semi-arid areas. The annual precipitation east of this line is generally above 400 mm, which is a semi-humid area, and the annual precipitation west of this line is generally below 400 mm, which is a semi-arid area.
(3) 200 mm annual equal precipitation line: from the western part of the Inner Mongolia Autonomous Region through the western part of the Hexi Corridor and the northern Tibetan Plateau, this line is also the dividing line between arid and semi-arid areas.
2. The dividing line between the monsoon zone and the non-monsoon zone
Daxing'anling - Yin Mountain - Helan Mountain - Bayankara Mountain - Ganges Mountain. South of this line can be affected by summer winds, that is, the southeast monsoon from the Pacific Ocean or the southwest monsoon from the Indian Ocean, with more precipitation, and the areas north of this line are more difficult to be affected by summer winds, and precipitation is scarce.
3. Topographic boundaries
(1) The dividing line between the first and second steps: Kunlun Mountain - Arjin Mountain - Qilian Mountain - Hengduan Mountain.
(2) The dividing line between the second and third steps: Daxing'anling - Taihang Mountain - Wushan - Xuefeng Mountain.
4. Topographic zone boundaries
Daxing'anling: The dividing line between the Inner Mongolian Plateau and the Northeast Plain
Taihang Mountains: Loess Plateau and North China Plain
Wushan: Sichuan Basin and the middle and lower reaches of the Yangtze River Plain
Wuyi Mountain: Jiangnan hills and Zhejiang and Fujian hills
Tian Shan: Junggar Basin and Tarim Basin
Great Wall: Inner Mongolia Plateau and Loess Plateau
Qinling: Han River Valley and Weihe Plain
Daba Mountain: Han River Valley and Sichuan Basin
Qilian Mountains: Qinghai-Tibet Plateau and Hexi Corridor
South Ridge: Jiangnan Hills and Liangguang Hills
Hengduan Mountain: Qinghai-Tibet Plateau, Sichuan Basin and Yunnan-Guizhou Plateau
5. The dividing line between the inflow area and the outflow area
The west side of Daxing'anling - YinShan - Helan Mountain - the eastern end of Qilian Mountain, the southern section is closer to the 200 mm and other precipitation lines. Most of the area north of the line is an inflow zone (except for the Irtysh River Basin), and most of the area east to the south is an outflow zone (except for the no-flow zone on the Ordos Plateau and the individual no-flow zone in the Songnen Plain).
The average temperature in June and January is 0 °C isotherm
Along the Qinling-Huai River line, it turns westward towards the southeastern edge of the Qinghai-Tibet Plateau. In January, the norther to the north of this line, the lower the temperature, and the further south, the higher the temperature.
7. Dividing line of the water system
Yangtze River system and Yellow River system: Qinling Yangtze River system and Pearl River system: Nanling Huai River water system and Haihe River system: Yellow River (the lower reaches of the Yellow River are above-ground rivers)
8. Annual solar radiation line
Daxing'anling – west of Beijing – Lanzhou – Kunming, then turn north to southern Tibet. The vast area west and north of this line is very rich in solar radiation, especially in the Qinghai-Tibet region and southern Xinjiang. The area east and south of this line has weak solar radiation.
IX. The human and geographical boundaries of our country
(1) Population dividing line: Heihe River in Heilongjiang - Tengchong in Yunnan. The area south of the east of this line is less than half of the country, but the population accounts for the vast majority of the country, while the area north of the west of this line accounts for most of the country, but it is vast and sparsely populated.
(2) The dividing line between cultivated land dominated by paddy fields and cultivated land dominated by dryland: Qinling -Huaihe line
(3) The boundary between traditional grazing areas and traditional farming: Daxing'anling - Yinshan - Lüliang Mountain - HengduanShan.
10. Qinling Mountains and HuaiHe River
An important geographical dividing line of our country, the north-south landscape of this line is very different:
(1) the southern boundary of the Loess Plateau;
(2) Roughly the place where the isothermal line of 0 °C and the precipitation line of 800 mm pass in January;
(3) the boundary between subtropical and warm temperate zones;
(4) the boundary between the humid zone and the semi-humid zone;
(5) The boundary between subtropical evergreen broad-leaved forests and temperate deciduous broad-leaved forests;
(6) The boundaries of whether the river has an ice age;
(7) the boundaries between agricultural paddy fields and drylands, two-year three-cropping and one-year two-cropping systems, and rice and wheat grains;
(8) The dividing line between the Yangtze River system and the Yellow River system
11. Daxing'anling
It is also an important geographical dividing line in China, and the landscape on its east and west sides is also quite different:
(1) Where the 400 mm and other precipitation lines pass
(2) the boundary between monsoon zones and non-monsoons;
(3) the dividing line between the inflow zone and the egress zone;
(4) where pastoral and agricultural areas pass;
(5) the boundary between the Inner Mongolian Plateau and the Northeast Plain;
(6) The boundary between the second and third steps of China's terrain;
(7) The boundary between forest landscape and grassland landscape.
The knowledge points of important geographical boundaries in China are more complex, and candidates can consolidate their grasp through the real questions and question banks in the past years.