China s great northwest has gradually become a desert, what is it like?

China's great northwest has gradually become a desert, what is it like? The great northwest of our country gradually turned into a desert, and due to the limitations of natural geographical conditions, the Himalayas in the southThe gas was obscured, causing a prolonged drought here.

As we can see from the real map, the western part of China is red, in other words, most of the places here are not covered by plants, and the reason for that is related to the geographical factors of that place, in other words, there is no precipitation and long-term wind and sand, which causes further deterioration of the natural environment. In recent years, the state has tried to clean up the desert here, and it has achieved good results, but some areas have gradually become deserts.

The northwestern part of the country tends to slowly turn into deserts, also due to the climate change on the planet and its geological structure. InIn the western part of the country, there has been a long and severe drought here, also because there are no dry gases to enter. This is mainly because the Southern Alps cover a lot of precipitation in the Pacific Ocean, after all, in the Pacific Ocean in China, there are very strong typhoons every year, but they just can't blow the Great Northwest region.

And it has been blown up by the cold weather cyclone in the northern part of the car owner for a long time, which has caused many green plants to be difficult to go deepest and slowly spread to the desertification of the land.

Although the northwest of our country has gradually become desertified, it is a good choice for abundant productsIt is said that the per capita arable land of the people here is acre, and the land area is about five times the average of the whole country. In addition, the mineral resources of the northwest are very colorful, many rare minerals in our country are from here, and according to the relevant authoritative experts estimate, the exploration and use value of this land can reach more than 3 billion yuan, in which coal energy is also very rich, accounting for about 25% of the reserves throughout the country. Natural gas resources are also very high, so the great northwest of our country is a big treasure plate.

The reason why China's great northwest has gradually become a desert is due to geographical factors, the Himalayas in the south block the humid air, resulting in perennial drought here.

It is because there is no water, so these places become deserts, which is directly related to the geographical environment.

It turns out that at this time, the water vapor from the Indian Ocean will be transported far and continuously to the Asian region, which can nourish the local land.

<>1. The causes of desertification, from the perspective of natural factors, loose soil, coupled with the number of windy days and concentration, the climate is arid, and the precipitation is bright and low. The main manifestations of human factors are excessive firewood, overgrazing, over-reclamation, improper use of water resources, and lack of attention to environmental protection in industrial and mining transportation.

2. Prevention and control of desertification and rational use of water resources; the use of biological removal measures and engineering measures to build a protection system; regulating the relationship between agriculture, forestry and animal husbandry; Jingsheng has taken comprehensive measures to solve the energy problem in agricultural and pastoral areas in multiple ways; Population control (or: adjust the land use structure, return farmland to forest and grassland; expand the area of forest and grassland, and intensively manage the lowland between the hills with good water and soil conditions; It is also possible to create field protection forests and shelterbelts).

1. The process of desertification caused by natural geographical conditions and climate variation is slow, and human activities stimulate and accelerate the process of desertification, which has become the main cause of desertification.

2. The pressure of population growth on land is the direct cause of land desertification. Overgrazing, extensive management, blind reclamation, irrational use of water resources, excessive deforestation, and irrational mining in arid land are the main manifestations of human activities accelerating the expansion of desertification. Indiscriminate digging of Chinese medicinal materials and deforestation are human activities that directly lead to land desertification.

In addition, irrational irrigation methods have also caused secondary salinization of cultivated land.

3. Arid and semi-arid and sub-humid arid areas are located deep in the hinterland of the continent, and are the most arid and fragile environmental zones with the least precipitation foci, the largest evaporation, and the most arid and fragile environment in the same latitude in the world. Desertification develops when the climate becomes drier, and when the climate becomes wetter, desertification reverses. In recent years, sandstorms that frequently occur in northwest China and north China (north) have aggravated the desertification process in these areas.

It's fair to say that this part of northwest China is inherently desert – and this is inextricably linked to the geography surrounding the Taklamakan Desert. Every year in July, the southwest monsoon blows; At this time, the water vapor from the Indian Ocean will be continuously transported to the Asian region under the drive of this wind, which will nourish the earth.

So, for the foreseeable future, unless humanity has the means to flatten the entire Tibetan Plateau or build an "east-to-west water transfer" project the size of a thousand south-to-north water diversion projects to transport large amounts of water to the northwest region, this desert will always be like this.

The gradual transformation of China's northwest into a desert is due to the destruction of vegetation, the rapid increase in population, and the loss of soil and vegetation due to indiscriminate logging.

The main reason is that the northwest has always been a place where ancient herders lived, and the soil erosion is serious, coupled with the scarcity of rainfall, it has become what it is now.

Because the current economy is in the south and southeast, and the northwest region is gradually declining, so the current northwest has gradually become a desert, and the current terrain has changed, and the northwest has gradually become desertified.

The wind and sand are severe, uninhabited, the land is deserted, unmanaged, and it is difficult to plant trees and not easy to feed.

Because the great northwest region of China is not suitable for the growth of plants, there are very few plants, so it slowly turns into a desert.

Because most of the Northwest Territories have a warm temperate arid climateFar from the sea, coupled with the relatively high altitude here, it is surrounded by mountains and plateaus, and water vapor cannot enter hereTherefore, the precipitation in the northwest is the lowest in our country all year round, so the vegetation that feeds is often not much, and most places are dominated by deserts.

Speaking of the great northwest of our country,I believe that most people's first reaction is Gansu, Ningxia and other places, China's northwest region mainly includes Gansu, Qinghai, Ningxia, and Xinjiang, and sometimes Shaanxi ProvinceAfter all, Shaanxi has always belonged to the western region in history, and in the northwest of our country, it is also a vast and sparsely populated placeThere are more desert areas here, and the population density is relatively small, many people feel strange, why there are so many deserts in the northwest, the key reason is related to the geographical environment.

China's northwest is located in an arid climate, even a slightly wetter place, can only be semi-arid, because most of the places in the northwest are far from the oceanAs a result, it is almost unaffected by the maritime climate and is surrounded by relatively high altitude plateaus and mountains, so water vapor cannot enter the northwest region, which is why it rarely rains in the northwest of our countryIt has become the place with the least rainfall in the same latitude in the world, and it is also the place with the largest evaporation, and another reason is related to human activities.

Desertification occurs when there is little rainfall, overgrazing, very strong winds, and poor natural conditions, which damage the plants.

First, precipitation, plants can only grow if there is water. Second, there is too much grazing, and the speed at which plants grow is not as fast as that of animals.

I think it's because the northwest wind is blowing too much.

Because there is little precipitation and it is relatively arid.

That's because of the lack of water resources in the Great Northwest.

Natural causes plus man-made destruction.

Because people are not paying attention, the environment is destroyed.

Water resources are slowly scarce, and vegetation is scarce.

Because its natural conditions are really harsh.

The water resources themselves are very small, and the environment is destroyed.

Because the environment has been damaged, but there is no way to compensate.

This is because there are very few plants there and there is very little water.

(1) Decreasing drought intensification (3 points).

2) Arid climate The climate is arid, the surface water is poor, and the physical weathering and wind force are significant, forming large areas of Gobi and desert; The arid climate, sparse vegetation, poor soil development, loose sandy sediments on flat land, and the large number of windy days in the dry season of winter and spring every year have created favorable conditions for wind-blown sand activities. (2 points) as appropriate

3) Over-harvesting, over-grazing, over-cultivation (3 points).

4) Decline in land productivity and land degradation (2 points).

Test question analysis: 1) From the location of Northwest China on the regional map, it can be seen that Northwest China is located inland, the farther west it is from the sea, the less affected by the ocean, and then observe the annual isoprecipitation line, most of the areas do not exceed 400 mm, and the general trend of precipitation from east to west decreases (it is worth noting that the precipitation in the western part of the Tianshan Mountains and some parts of the Altai Mountains exceeds 400 mm), it can be summarized that the most significant natural feature of Northwest China is drought, and with the increase of distance from the sea, the precipitation in this region decreases from east to west. Drought intensification.

2) The arid climatic conditions largely determine the vulnerability of the ecological environment in Northwest China. The fragility of the ecological environment is that the biological population is relatively single and fragile, and the ecological balance is easily damaged. Desertification in Northwest China is mainly manifested in desertification, the climate of the region is arid, the surface water is poor, the physical weathering and wind effect are significant, the formation of a large area of Gobi and desert, the climate is arid, the vegetation is scarce, the soil development is poor, and the flat land is mostly loose sandy sediments, which has the material conditions for desertification. There are many windy days in the dry season in winter and spring, which has the dynamic conditions for desertification.

3) Human activities often play a decisive role in the occurrence and development of desertification, and human causes are the pressure of population surge on the ecological environment on the one hand, and the unreasonable and excessive use of land and water resources by improper human activities on the other hand. The main manifestations of human factors are: over-mining, over-grazing, over-reclamation, irrational use of water resources, industrial and mining construction, etc.

4) Understand the meaning of the coordinates of the figure, the vertical axis represents the level of land productivity, and the horizontal axis represents the development of desertification, and it can be seen from the figure that in the development process of desertification, land productivity is declining, the degree of desertification is intensifying, and the essence of desertification is land degradation. Therefore, the end result of land desertification is the decline of land productivity and land degradation.