The geographical significance of the dividing line between the Qinling Mountains and the Qinling Mountains is as follows:
1. The dividing line between north and south of China:?
In most areas north of the Qinhuai River, rivers and lakes close together in winter Ice, whenever winter comes and the north wind blows, most trees will fall off their leaves. The leaves that do not fall off are mostly needle-shaped and are called coniferous trees. Since the annual precipitation in the northern region is less and most of the precipitation is concentrated in summer, the amount of water in the rivers is not large and the water level changes greatly. The flood season is only formed in summer and the time is relatively short. The sediment content of the rivers is large. ?
On the contrary, in the area south of Qinhuai, there is no ice in winter, the trees do not lose their leaves, and they are evergreen all year round. The water volume of the river is large, the water level does not change much, the flood season is long, and the sediment content of the river water is small.
2. China’s 0°C isotherm:
Qinling-Huaihe River is my country’s 0°C isotherm in January. The average January temperature in the south of the Qinling Mountains and the Huaihe River is above 0°C, and there is basically no ice in winter; the average January temperature in the Qinling Mountains to the north of the Huaihe River is below 0°C, and it is generally icy in the winter.
3. The dividing line between humid and semi-humid areas:?
In the humid area south of the Huaihe River in the Qinling Mountains, crops and grain production can achieve three crops a year or three crops every two years. , and at the same time the rainfall is obviously abundant, which is the dividing line of 800 mm rainfall. To the north of the Huaihe River in the Qinling Mountains, not only has rainfall significantly decreased, turning it into a semi-humid area, but the number of times crops have matured has also decreased, becoming an area with three crops in two years, or two crops in one year.
The dry and wet areas in our country are mainly divided into humid areas, semi-humid areas, semi-arid areas, and arid areas. The Qinling Mountains-Huaihe River line happens to be the humid area and semi-humid area divided into two halves.
4. The dividing line between subtropical monsoon climate and temperate monsoon climate:
Qinling-Huaihe River is the dividing line between subtropical monsoon climate and temperate monsoon climate. In summer, it is hot and rainy south and north of the Qinling Mountains-Huaihe River. In winter, the south of the Qinling Mountains and the Huaihe River is mild and drier, while the north of the Qinling Mountains and the Huaihe River is cold and dry.
5. The dividing line between the Yangtze River Basin and the Yellow River Basin:
In the eyes of geographers, the Qinling Mountains are the watershed between the Yangtze River Basin and the Yellow River Basin. It and its extension line, the Huaihe River, form the north-south dividing line (belt) in eastern China. This is the origin of the country's geographical pattern of "rice in the south and north", "boats in the south and horses in the north", and "floods in the south and drought in the north".