What did the original Loess Plateau look like?!

The original Loess Plateau is a good place, now, when you stand on the Loess Plateau, look around, full of desolation, the Loess Plateau is full of ravines and barren mountains and bald mountains, wind and sand.

In fact, the original Loess Plateau was not like this, the original Loess Plateau had vast, lush forests and boundless grasslands, birds singing, animals flocks, a thriving scene, and it was also very suitable for human life. However, due to the excessive concentration of population, human beings have continuously deforested for their own interests, resulting in the reduction of forest area, long-term predatory development and war, etc., which have destroyed vegetation and caused serious soil erosion and ecological balance imbalance. Today, the Loess Plateau has become a desolate scene.

The price paid by humanity for its own destruction of the ecological balance is dearly!!

In the 30s of the 20th century, when the researchers of Mr. Yang Zhongjian, the teacher of Academician Liu Dongsheng, laid the foundation for the study of the Loess Plateau in China, they believed that the formation of loess was a matter of more than 100,000 years. After the 50s, with the efforts of Academician Liu Dongsheng's generation, the history of loess was pushed back to the early Quaternary period (the latest period in geology, about 3 million years ago to the present), about 2.6 million years ago.

Since then, Academician Liu's students An Zhisheng, Ding Zhongli and others have pushed it back to 600.8 million years ago; The younger generation of Guo Zhengtang and others recently dates back to 22 million years ago.

In March 2002, a research team led by Guo wrote in the British journal Nature that by analyzing the sediments in the western part of the Loess Plateau, it was found that deserts appeared in this part of China as early as 22 million years ago. This achievement is widely recognized by the scientific community, with one German scientist saying: "This is the autobiography of the Himalayas."

At the same time, it is also of practical significance for understanding the mechanism of desert evolution and sand and dust storm control.

However, people still generally believe that the Loess Plateau "had a large area of forests in history, and in the most lush period of forests, most of the mountain fields were lush and green, and "forests everywhere" were measured according to the distribution map drawn by it, and it can be seen that the forest land in the Western Zhou Dynasty and the Spring and Autumn Period accounted for 53 of the entire Loess Plateau area. The rapid increase in population has expanded the demand for arable land, and a large amount of woodland on the Loess Plateau has been reclaimed for farmland. The pastures around Chang'an have also been eaten up by many domestic animals, and a large area has been degraded.

The total reduction of the primeval forests north of the Huai River is devastating. Especially in the capital of Yuan Jiandu, the Tang Dynasty poet Bai Juyi's famous work "Charcoal Seller" is familiar to everyone, which says: Cutting and burning charcoal in the South Mountain, ·· The South Mountain here is the South Mountain.

It reflects the situation at that time, people cut down the trees of Zhongnan Mountain to burn charcoal, and the residents of Chang'an City kept warm. It is said that the forests of Jungnan Mountain were finally burned down by the inhabitants of Chang'an Castle.

Recently, Liu Dongsheng, a senior academician of the Institute of Geology of the Chinese Academy of Sciences (winner of the Taylor Award, the highest honor in the world's environmental science), said

Judging from the ancient soils, carbon isotopes, ancient plant spore pollen and animal fossils buried in the loess, these areas were grasslands rather than forests in the past, and the climate was relatively arid, and it is likely that there has never been a large area of forest vegetation on the Loess Plateau, which has important implications for how to reasonably and effectively protect and manage the environment of the Loess Plateau.

The original Loess Plateau was all primeval forest. Otherwise, how could there be so much coal in Shanxi? There are still a lot of undeveloped primeval forests in Shanxi. It's just that the environment doesn't work anymore.

The original Loess Plateau was a sea of forests and grasslands, that is, a primeval forest.

The soil is scraped in, Qinghai-Tibet, it can't be how good it is, and when will it be.

Liu Dongsheng, a geological scientist in New China, led the team to tackle key problems in scientific research for many years, went through hardships, and finally helped us understand the book of loess! The theory that has been recognized by the world has solved the mystery of the formation of the Loess Plateau - the theory of new wind formation".

The Loess Plateau is a vast place.

Alas! Old things, don't mention them!

The Loess Plateau is an important geographical region in China, with an area of about 600,000 square kilometers, located in the middle reaches of the Yellow River Basin. The loess on the Loess Plateau is formed by a variety of factors. Among them, the sediment of the Yellow River, the Yangtze River, the Huai River, the Haihe River and other rivers is one of the main loess.

When these rivers flow through the Loess Plateau, sediment is difficult to suspend in the water due to the deceleration of the water flow, so a sedimentary layer is formed on the Loess Plateau. In addition, natural factors such as wind erosion, freeze-thaw, and vegetation destruction are also important reasons for the formation of loess.

Loess on the Loess Plateau is a very important soil type with unique physical, chemical, and biological properties. Loess contains a lot of cohesive minerals and organic matter, which are very beneficial for plant growth. In addition, loess has a large porosity and strong ability to retain water and nutrients, so it is widely used in agricultural production and forestry, making an important contribution to China's food production and forest resource protection.

However, due to human overexploitation and environmental destruction, the ecological environment of the Loess Plateau is facing a serious threat. A large number of problems such as soil erosion, land desertification and desertification have had an irreversible impact on the local socio-economic and ecological environment. Therefore, protecting the ecological environment of the Loess Plateau and realizing sustainable ecological and economic development has become an urgent problem to be solved.

To this end, China has taken a series of measures, including the implementation of afforestation, grassland restoration, soil and water conservation, desertification control and other projects, as well as the implementation of the policy of returning land to forest and grassland, and other measures to promote the ecological environmental protection and sustainable development of the Loess Yuanbo Plateau. At the same time, it is necessary to strengthen scientific research and technological innovation, increase investment, and promote the ecological environment construction and economic development of the Loess Plateau to achieve better results.

Classification: Regional.

Problem Description: Detailed Resolution:

One is that the northerly winds prevailing in this region bring Xinjiang. A large amount of silt in northern Ningxia, Inner Mongolia and even far away in the deserts of Central Asia has been scraped to the Loess Plateau and piled up. Because the composition of the bedrock at the bottom of the loess plateau is not the same as that at the bottom of the loess.

The lower part of the loess has a variety of landforms and large undulations, but the thickness of the upper sedimentary loess is roughly similar, and there is a tendency to gradually thin from east to west, which is consistent with the direction of the loess ** in the west. This indicates that the loess was moved from elsewhere.

However, many scientists have found that there is a gravel layer at the bottom of the loess layer, and this gravel layer is a typical river sediment. Therefore, they believe that the origin of the loess is in the upper source of the Yellow River, which was formed by the river washing down the loess.

There is also a view that the loess is neither aeolian nor water-formed, it is formed by continuous weathering on the basis of the original, and it is native.

There is also a comprehensive view that the Loess Plateau is formed by the combined action of these three forces, which are both from the northwest and Central Asia, carried by strong winds and flowing rivers, and weathered by local native bedrock.

Just as people chant about the Loess Plateau, people also argue about the Loess Plateau. Hopefully, one day researchers will be able to give people a satisfactory answer.

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Except for a few stony mountains, the Loess Plateau is covered with a deep loess layer, with a thickness of 50 to 80 meters and a maximum thickness of 150 to 180 meters.

According to the geo-pin fan Dan profile, the Middle Pleistocene alluvium, the late Early Pleistocene loess layer, the Early Pleistocene Sanmen Formation, the Late Tertiary red clay, the Ordovician limestone and the metamorphic deficit rock.

To put it simply, it is a loess layer plus clay and rock.

Historically, the Loess Plateau had vast, lush forests and boundless grasslands, birds singing, and animals flocking, a thriving scene. It is also very suitable for human life, but due to the excessive concentration of population, human beings have continuously deforested for their own interests, reducing the forest area, long-term predatory development and war, etc., destroying vegetation and causing serious soil erosion and ecological balance imbalance. Today, the Loess Plateau has become a bleak scene, and the price paid by human beings for their own destruction of the ecological balance is dearly.

The Loess Plateau, located in the north-central part of China, is one of the four major plateaus in China, one of the birthplaces of the ancient civilization of the Chinese nation, and the most concentrated and largest loess area on the earth, with a total area of 640,000 square kilometers.

The reason for calling the Loess Plateau: It is the most concentrated and largest loess area on the earth, with a total area of 640,000 square kilometers.

Loess Plateau: Located in the north-central part of China, it is one of the four major plateaus in China, one of the birthplaces of the ancient civilization of the Chinese nation, and also the most concentrated and largest loess area on the earth, with a total area of 640,000 square kilometers, spanning most of the 7 provinces and regions of China's Qinghai, Gansu, Ningyaopai, Inner Mongolia, Shaanxi, Shanxi and Henan, mainly composed of Shanxi Plateau, Shaanxi-Gansu-Jin Plateau, Cha Infiltration Longzhong Plateau, Ordos Plateau and Hetao Plain.