The Yellow River is yellow now. Was it yellow in ancient times?

Politically, Emperor Wu of the Han Dynasty advocated "abolishing a hundred schools of thought, only respecting Confucianism, expanding the territory and expelling the Huns". Everyone knows these "wise decisions". Behind these political opinions, there is another far-reaching and little-known event, that is, turning the Yellow River water into "yellow sauce soup".

Vast grasslands and beautiful hills. The Yellow River was clear in the pre-Qin period.

Before the Han Dynasty, the Yellow River was very clear. In the pre-Qin period, the ecological conditions in the middle and upper reaches of the Yellow River were good. At that time, Qin people lived in the upper reaches of Weihe River, which may become a special grazing area. It is conceivable that the area east of Liupanshan was a vast grassland at that time. At the end of the Warring States period, animal husbandry was also developed in the upper reaches of Shuijing (now Pingliang City, Gansu Province), and there were still virgin forest areas in the early Western Han Dynasty.

Why is the ancient clear Yellow River so yellow now?

primeval forests

During the Qin and Han Dynasties, Shanglinyuan was a royal garden, spanning five counties of Chang 'an, Xianyang, Zhouzhi, Huxian and Lantian, with a total length of 300 miles. According to historical records, there are "giant trees in the deep forest" in Shanglinyuan, as well as various fruit trees, and there are wild animals such as bears, tigers, leopards and deer in British Columbia. 127, Wei Qing, a general of the Han Dynasty, attacked Xiongnu in "Henan" (Hetao area and Ordos Plateau) and captured more than ten thousand cattle and sheep 1 27. How much forage cattle and sheep eat every day shows that aquatic plants were abundant and dense at that time.

To sum up, it can be proved that the vegetation coverage of the upper reaches of the Yellow River in the pre-Qin period was relatively high. So there is little soil erosion, and the Yellow River is obviously clear. Then why is this happening? Why is it getting worse? There is only one answer, and that is the movement of the agricultural nation.

In the pre-Qin period, the upper reaches of the Yellow River led to many nomadic tribes. The production and lifestyle of these countries determine that they have little damage to vegetation and relatively balanced ecological environment.

What is the ancient Qing Yellow River water?

lawn

A large number of immigrants flooded into the middle and upper reaches of rivers, and agriculture destroyed the ecological soil.

This balance has been broken. From Liang Wudi to Xiongnu, Wei Qing recovered "Henan Land". Emperor Wu of the Han Dynasty immigrated to northern Shaanxi and Hejian100000 people.

In the year of 120, the flood in Kanto has moved to the lower reaches of the Yellow River, Henan and Hebei. In BC11year, monks were driven out of the water. Han people began to migrate to the river basin. In the same year, the Han Dynasty sent 600,000 troops. Used to prevent head invasion.

It is impossible for Han people to learn grazing and hunting when they come to grassland jungle areas. Still have to give priority to their traditional farms, so everyone is dry, chop and burn. Soon, the natural landscape of forests and grasslands was connected, and the agricultural landscape of villages was replaced. With the development of agriculture, the population has also increased. In the second year BC, the area of Longmen Yellow River exceeded 2.8 million. What is the ancient Qing Yellow River water?

The soil in the Loess Plateau is very loose and its anti-erosion ability is very weak. Turned into land, the root of primitive plants. When it died, its surface was exposed, the land was affected, and the vegetation was difficult to recover because of Sha Fei. When the rainstorm came, it not only deepened the original gully, but also rushed out of the rill and rushed into the gully.

After Emperor Gaozu, the lower reaches of the Yellow River increased significantly. The Yellow River was originally called the "big river". The western part of the Han Dynasty was called the Yellow River. It was officially named in the Tang Dynasty. A lot of wood is mostly cut down from the western mountainous areas, so the water in the Yellow River is becoming more and more yellow, and it has become today's "yellow sauce soup".