Why have there been no sandstorms in Beijing in recent years?

In Beijing, we eat smog in February, sandstorms in March and catkins in April. Seeing that March is about to pass, sandstorms have not spared Beijing. On the 27th and 28th, the Central Meteorological Observatory successively issued blue warnings of dust. Early in the morning, the smog map in Beijing exploded the circle of friends, and pedestrians on the road also wore thick masks.

Real-time air quality in Beijing

When it comes to sandstorms, old Beijingers will be familiar with them. In 26, the dust fall of sandstorm in Beijing even reached 33, tons. Sandstorms have indeed eased in recent years, which is behind the silent efforts of a group of people. If it weren't for them, the sandstorm you experienced today might be 1 thousand times more severe. This is not an alarmist.

The harm of sandstorm can affect all aspects of human production and life. Sandstorm affects normal photosynthesis and causes crop yield reduction. According to incomplete statistics, the sandstorm in 2 brought direct economic losses of more than 1 million yuan to Jinchang and Wuwei. When people are exposed to dusty weather, dust containing various toxic chemicals and germs can enter human organs through layers of protection, which is harmful to human health.

The war between man and sandstorm is the war to defend Saihanba

The Hunshandake sandy land in Inner Mongolia, which is less than 2 kilometers north of Beijing, is one of the important sources of sandstorm. The altitude there is more than 14 meters higher than that in Beijing. When the north wind blows, sandstorms run straight through Beijing and Tianjin. Saihanba, just at the front of Hunshandake sandy land, is the last barrier to protect Beijing and even the whole North China. It is urgent to block this vent. How on earth do humans drive away sandstorms? The film Madman in the Wild reveals the moving story behind it for us.

There was no sandstorm in Beijing, because Saihanba was a natural oxygen bar with dense forests and abundant aquatic plants, and the dense trees kept the sandstorm behind it. However, in the Qing Dynasty, the state treasury was empty and wantonly cut down, and mankind's unrestrained demand from nature was retaliated by nature. Without the protection of Saihanba, the north wind from Siberia swept south with dust, carrying sand that could devour the whole city of Beijing. Planting trees, greening Saihanba and driving away sandstorms have become the primary tasks of Saihanba people.

it's easy to cut down, but it's easier to replant.

there are prerequisites for planting trees. For the five factors of cold, high altitude, strong wind, desertification and little rain, no matter which one, it is fatal to the survival of trees. Unfortunately, Saihanba combines all the above extremely harsh planting conditions. When planting trees on the dam for the first time, the survival rate of trees was less than 8%. Seeing that all the saplings planted hard died, the cruel reality crushed their dreams.

Whether Saihanba can plant trees or not is a question that haunts people in Saihanba. But the word "give up" is not in the dictionary of the wild man. In 1961, Liu Kun, then deputy director of the General Administration of State-owned Forest Farm of the Ministry of Forestry, was ordered to board Saihanba with six experts. At this time, the appearance of a larch tree made people shine. A group of people rushed to embrace the tree and burst into tears. They cried and said, "Saihanba can plant trees and grow big trees. We want to build a big forest and a big forest around it! " It is this "meritorious tree" that supports the Saihanba people to today.