Return to the prosperous Tang Dynasty? The dry lakes and rivers in the northwest are "resurrected", and Xinjiang is being transformed into Jiangnan?

In the solar system, Venus has a high temperature as high as 500 degrees Celsius, while the temperature difference between day and night of Mars exceeds 100 degrees, and there is a super cyclone storm on the surface of Jupiter. It can be said that the earth has the mildest temperature among them.

However, the earth has not had such a mild climate since its birth. When it was first born, the surface temperature could reach 1500 degrees Celsius. Hundreds of millions of years later, from hot to cold, from cold to hot, just have such a suitable temperature for human survival.

However, the temperature of the earth is not constant for a long time, but fluctuates constantly. Under such development, the geographical environment in different parts of the earth is different.

For example, some places are covered with ice and snow all year round, and some places are warm and humid. Today we are going to talk about the northwest of the vast Gobi.

Ancient mountain area of Helan Mountain

When it comes to northwest China, people may think of dry land and endless desert at the first time, but in fact, as early as the prosperous Tang Dynasty, northwest China was also called "the name of the south of the Yangtze River". "The shallow grass is fragrant and fragrant, and the light sail is hunting and sending fishing songs. The scenery is better than Jiangnan, and it is difficult to describe it with a bald pen. " This is a poem written by the ancients for the northwest region at that time.

Poetically, melodious flute sounds came from the velvet grass, and beautiful fishing songs floated on the sails in the lake, which is completely different from what we know or see in the northwest today.

According to the historical geography of China, 5000 to 7500 years ago, the rainfall in northern China was much more than it is now, reaching 500 mm. ..

In addition, the ancient north was more inclined to the subtropical climate, and the temperature was 2 to 7 degrees Celsius higher than today. This climate makes the northern land fertile, rich in fish and rice, and covered by lakes and green forests. It was during this period that rice and millet were cultivated in northern China.

However, during the Eastern Han Dynasty and the Southern and Northern Dynasties, the temperature in the northern region changed quietly, the temperature gradually decreased and the rainfall decreased. Compared with other places, its phenological node was 10 to 15 days later, and the crops did not grow normally as before.

There is not enough food and grass, and the people are hungry. In desperation, the northern nomads began to go to the southern region to rob others of food for a living, and the famous "five flowers" in history also happened.

However, such a cold period began to change in the Tang Dynasty, and once again returned to the previous warm period, with abundant grass and sufficient food, which was called "blocking the south of the Yangtze River".

However, the good times did not last long. In the Song Dynasty, the climate in the north changed again, and it has dried up so far.

The dry river has come back to life?

Recently, however, a new phenomenon has appeared in the northwest, and the dry river has been "revived". Will the climate in the northwest change again and return to the state of "shallow grass smelling flute and light sail hunting and sending fishing songs" in the prosperous Tang Dynasty?

First of all, Lake Harano in Dunhuang City, Gansu Province was originally a river and lake in the lower reaches of Shule River. But in the Qing Dynasty, diversion irrigation was very popular at that time, and Lake Harano was one of them, so it developed into a terminal lake. However, due to climatic reasons, the lake gradually dried up in the sixties and seventies, and there was no water.

In recent years, Yuan Ye is dry and mottled, the lake bottom is exposed to the sun without reservation, and calcite like rice grains is covered all over the floor. If it is not an obvious depression, people seem to have forgotten that it used to be a lake.

But from 20 16, the lake began to appear in Haranole, and the water surface gradually rose. By 20 17, the lake area has reached 24 square kilometers.

No one expected that Harano, which had not seen the lake for more than 60 years, even nearly cracked, once again returned to the scene of water and sky. Since its "resurrection", the lake is crystal clear and looks down like a big mirror on the vast Gobi desert, which is absolutely beautiful.

As mentioned earlier, Haranole was originally the channel lake of Shule River, and it became the terminal lake due to water irrigation in Qing Dynasty.

What is even more amazing is that in 20 19, due to the continuous rise of Lake Harano, the lake water actually flowed to the river that had been dry for more than 300 years.

With the increase of water volume, the lake gradually extended to Halac, which is140km away.

Halac is the tail of Shule River. Before the river dried up, it was full of lush aquatic plants and rippling lakes, which were very beautiful. However, due to the destruction of the ecological environment, it gradually disappeared in the later period.

Another phenomenon, also located in Xinjiang, is taitema lake, the terminal of the Tarim River. Taitema lake is connected with Lop Nur, but as Lop Nur gradually dries up, Taitema Lake gradually disappears and becomes a dry lake.

But now, the lake in taitema lake is gradually rising, forming a great beauty of National Highway 2 18.

Reasons for the "Revival" of Rivers

These phenomena in northwest China surprised people. Through research, it is found that there is indeed a trend of warmth and humidity in northwest China, with the temperature rising and precipitation increasing, and the once endless desert gradually appears a green shadow.

So, why is this happening?

First of all, due to natural reasons, as mentioned above, northwest China does not always have such a climate. Nowadays, with the increase of precipitation, lakes and green forests will have better living conditions, and the ecological environment in northwest China will be gradually improved.

Second, the state's ecological control of desertification.

After desertification became more and more serious, China immediately invested tens of billions of dollars to control it. At present, the cumulative area of sand prevention and control in China is equivalent to the area of Zhejiang Province. Therefore, the gradual disappearance of desertification and the reappearance of lake green forests are also related to the governance of China.

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From the changes in northwest China from ancient times to the present, it can be seen that the ecological environment of a region directly affects the living conditions of local residents. Although the northwest region is developing in a good direction now, it also involves many problems, such as meteorological disasters caused by unpredictable weather and frequent floods caused by heavy precipitation.

Therefore, improving the ecological environment is a long-term thing, and building an ecological earth requires a lot of human efforts.