What is the current situation of desertification in China?

Introduction: Desertification in our country.

The land area is about 10,000 kilometers, accounting for the total land area of our country, and the current desertification land area in China is still expanding at a rate of 22,460 kilometers per year, and there is a trend of continuous expansion, which is important for China's economic development and sustainable social development.

have caused great harm. In the new half century, China has also been rectifying desertification, but the overall deterioration of the situation has not been completely improved, generally speaking, the speed of governance has not caught up with the speed of desertification, which also means that our desertification work has not been completely completed.

1. The main causes of desertification.

The main causes of desertification in China can be divided into two categories, namely natural causes and man-made causes, and the natural causes are global warming.

make the whole ecological environment conducive to the development of desertification; There are also unfavorable natural factors, such as desertification due to climate drought. The anthropogenic cause is the continuous growth of population pressure in China, which leads to the existence of the common phenomenon of indiscriminate deforestation, resulting in plant destruction, which leads to the rapid development of desertification.

2. The dangers of desertification.

First of all, desertification is the cancer of the planet.

It can be extremely harmful to each of us. The expansion of desertification will lead to some areas where we humans will be uninhabitable, and will also lead to a decline in land productivity, but our country is developed by agriculture, and if it is not managed, China's grain production may be reduced or even lost, which is also unfavorable to China's economic development.

3. How to control desertification.

The main method of desertification control in China is windbreak and sand fixation, which can effectively weaken the erosion of wind and save a certain amount of water, which is also conducive to the growth of plants in the sand. The second is to increase the vegetation environment, at present, planting grass and trees in China is also one of the main measures, precipitation in some deserts.

Planting is carried out in a relatively small area, so that the purpose of self-recovery of desertification can be achieved.

The current situation of desertification in China is not optimistic, and it can be seen that the area of desertification is also relatively large, and we should be vigilant.

The current situation is that more than 1,000 square meters are added every year, so that we may have less and less land, and the land we can use will gradually decrease.

China's land desertification is still expanding every year, so it is still necessary to strengthen desertification control.

Amazing achievements have been made, but the situation of desertification is still very serious, and it is still necessary to vigorously strengthen the planting of trees and the return of farmland to forests.

Desert is a landscape type that is formed by the action of climate and has little to do with human activities. There are two types of deserts, tropical deserts and temperate deserts. Tropical deserts are subject to a subtropical high pressure.

The images are formed and distributed in the Tropic of Capricorn.

Near the west coast of the continent. Temperate deserts are found in the interior of the mid-latitude continents. Your problem is problematic, not all deserts are without water, many deserts have abundant groundwater, but mostly salt water.

Deserts are naturally formed, some are artificially formed, overgrazing, artificial change of river channels, indiscriminate cutting and illegal logging, knife work and fire, all make a lot of land into deserts, once there is no vegetation, it can not store water, evaporation is greater than rainfall, so that the surface water content of the desert is extremely low. And the more places there are, the more rain falls. The desert has no vegetation and the temperature is persistently high, with its heat island effect.

Obviously, it makes the weak rain clouds less accessible, there is less rainfall, there is no vegetation, the higher the temperature, the greater the evaporation, making the vicious circle more and more intense!

An asteroid hits the Earth to form a crater, a crater shock wave.

The high-velocity flowing substance is converted into metallic hydrogen.

Metallic hydrogen polymerizes to form silica.

Silica accumulates to form a desert. In the desert, the basin formed by the sintering of the shock wave of the crater is impermeable and can form an oasis.

The cause of desert emergence is directly related to precipitation. There is no water and vegetation disappears, and life depends on water f. What survived were extremely drought-tolerant creatures.

The soil is blown away to form sand and dust, and the focus is continuously carried by the wind. In the end, conglomerates and strange rock masses that have been eroded by wind are left behind.

In the long run, it should be the movement of the earth's crust.

Deserts were the bottom of the sea a long time ago, and after the crustal changes and elevated, the land appeared, and the wind and rain were suitable for human habitation, the earth's crust continued to rise, and the water source continued to lack, and after a long period of change, the desert slowly formed, and some new landmasses also slowly appeared. That's why deserts are formed. We need a good, positive attitude towards the desert, and it is important to protect our environment and deal with the harsh desert environment.

Deserts are formed slowly by very high temperatures and a large amount of sand, and the desertification of the land is due to the fact that the soil is sandy soil, and after long-term exposure to high temperatures, it will cause the soil to desert, so it will slowly form a desert.

The factors that form deserts are generally natural factors and human factors, and the loose sandy sediments formed on the surface of the arid land have accumulated over time to become deserts, because the land is relatively arid, and the bad weather will desertify.

First of all, the climate is relatively dry, and this place is also relatively short of water, and the wind and sand in this place are also relatively large, and it has also been affected by natural weathering, and it has slowly formed a desert, and it has a lot to do with geological climate change.

It is formed by an arid climate, with scarce precipitation and destruction of vegetation. Because the sediment was blown away, a lot of stones were exposed, and under the action of wind erosion, they became smaller and smaller, and became a desert.

People overgraze, change the river at will, cut down indiscriminately, the land has no vegetation, the ground can not store water, will evaporate a lot of water, over time, the environment will become very bad, and a desert will be formed.

Land desertification refers to land degradation caused by factors including climate variability and human hand-held activities. The reasons for this are:

1. Human beings are noisy and cautious. Excessive reclamation, overgrazing, indiscriminate deforestation and irrational use of water resources have led to serious land degradation, deforestation and gradual drying of the climate, resulting in serious land desertification.

2. Population growth. The growing population is making the land area shrinking, leading to overuse of land.

3. Geographical factors. Arid and semi-arid regions are deep in the hinterland of the continent and have the least precipitation and the largest evaporation in the same latitude in the world, and these places are prone to desertification.

4. Climatic factors. When the climate dries, desertification develops; When the climate becomes wetter, desertification is reversed.

Desertification of land not only destroys the ecological environment on which human beings depend, but also directly affects agricultural production and economic development and construction.

China is a country with a wide distribution of deserts and desertified land in the world, with an area of 10,000 square kilometers of desertified land and 10,000 square kilometers of land with potential desertification risks. According to the data of the Lanzhou Desert Research Institute of the Chinese Academy of Sciences, in the 50s and 70s in China, the rate of land desertification increased by 1,560 square kilometers per year; From the 70s to the 80s, its rate has increased by 2100 square kilometers per year; At present, it has expanded to an annual increase of 2,460 square kilometers. The speed is astounding.

At present, about 60 million acres of farmland in China are under the threat of desertification. Although land desertification in some local areas has been effectively curbed or improved, on the whole, land desertification in China is still accelerating and spreading. If it is combined with the desert and the Gobi, there are 10,000 square kilometers, accounting for almost 16 of the country's land area.

In its 11th Five-Year Plan (2006-2010), China is expected to invest US$175 billion to tackle industrial pollution. Because there are a lot of factors that are not taken into account in the report, it may be that more money will be spent by then. In recent years, many countries have become increasingly aware of the serious consequences of land desertification.

Many countries regard the prevention and control of land desertification and the protection of the ecological environment as an important part of the country's sustainable development, and have formulated and implemented specific plans to prevent and control desertification in accordance with their national conditions, and have achieved certain results. However, the global desertification phenomenon is still very serious, and desertification control still requires the unremitting efforts of all countries. According to figures released by the United Nations, inappropriate human activities and climate change have led to the continuous degradation of land in arid areas, which accounts for 41 percent of the world's total, and the gradual expansion of desert areas around the world.

Currently, more than 1 billion people in more than 110 countries are threatened by desertification, of whom 13.5 billion are at risk of displacement. The global economic loss due to land desertification exceeds $42 billion every year. The World Health Organization reports that 100,000 people worldwide die each year from asthma due to indoor air pollution, and 35 of them are children.

Among children in the United States, 65 have asthma to varying degrees. The prevalence of asthma in Chinese children is 2 to 5. On August 29, 2006, farmers reported that 110,000 people die more than the average number of deaths (more than the average number of deaths) and 650,000 outpatient and emergency patients due to indoor air pollution in China each year, a significant proportion of whom are farmers, resulting in economic losses of up to US$10.7 billion in health hazards.

The World Health Organization reports that 80% of the world's diseases are caused or exacerbated by contaminated drinking water; 50% of child deaths are caused or exacerbated by contaminated drinking water; Every year, 25 million children die from diseases caused by drinking contaminated water; Every year, more than 5 million people are affected by infectious diseases such as cholera and dysentery caused by water pollution. Diseases caused by water pollution include:

Cancer, fluorosis, diarrhea, lead poisoning, arsenic poisoning, cadmium poisoning, mercury poisoning, etc. You'll probably be able to find this information.

About 15989674 square meters of desertification in our country are desertified.