What are the causes of drought in China? China s leylines are going to go out of China, and China wi

The first is the plateau thermal factor of the Qinghai-Tibet Plateau. Sichuan Province is greatly affected by the "roof of the world", the Qinghai-Tibet Plateau had little snow last winter, and the plateau thermal factors are good, which affects the drought in the province. The second is the impact of El Niño.

Under this influence, the heat flow in the surface of the Pacific Ocean travels eastward, carrying away tropical water vapor, resulting in more precipitation in eastern China. In contrast, tropical water vapour decreased, and water vapour from the south to the southwest also decreased. Third, the timing of cold air has not been mastered.

Although there have been several times of cold air affecting China this winter, most of the cold air has begun to move eastward in the north, directly "slipping" past the edge of Sichuan Province. Coupled with the relationship between the Qinling Mountains, if the cold air is not "strong" enough to climb the mountain, it will still not be able to affect the basin. Even though sometimes cold air enters the basin, with warm air forms the first condition for rainfall

Convective weather, but the second condition for the formation of rainfall, "water vapor", is not abundant, and precipitation cannot be formed. "It's a process that requires cooperation. It will not be relieved until at least June.

Mainly affected by barrage dams. 1. In the process of water storage, there is a shortage of water in the downstream riverbed. 2. As a result, the groundwater riverbed is water.

3. The lack of water reduces humidity and reduces water vapor. 4. As a result, the air circulation is insufficient. 5. It will intensify in the long run.

6. Groundwater is then exploited, and the underground riverbed dries up. 7. Trigger**. 8. After blocking the underground dry riverbed, the intricate underground water veins are reorganized.

9. As a result, the underground riverbed floods cannot be discharged, that is, floods occur frequently, washing the earth. 10. The result is caused by floods and snow disasters caused by ** and how high the humidity.

The drought in southwest China is intensifying. The direct cause of the severe drought is the persistent high temperature and lack of rainfall, but it is also difficult to rule out the human factor. While southwest China is suffering from a severe drought, Thailand, Vietnam and other Southeast Asian countries are also experiencing severe droughts.

In the face of the severe disaster, a small number of Southeast Asian countries believe that China's construction of dams in the upper reaches of the Mekong River has caused the drought to worsen, but China denies it.

Summary. Kiss: North of the mountains is a semi-humid and arid region of our country. The north of the mountain is dominated by dry land, the south of the mountain is dominated by paddy fields, the north of the mountain is a semi-humid area, and the south of the mountain is a humid area.

Good. Sub-question (2) of the 32 questions.

Kiss: The north of the mountain range is a semi-humid and arid area in China. The north of the mountain is dominated by dry land, the south of the mountain is dominated by paddy fields, the north of the mountain is a semi-humid area, and the south of the mountain is a humid area. Nayuan.

Thank you. Pro-slip Songpin: Chicken market is located in China's warm temperate and semi-humid region, belongs to the temperate monsoon climate, Baoji belongs to the northern region, Baoji is located in the Guanzhong Plain cherry banquet of the Xixin tour department, belongs to the temperate semi-humid climate.

China's drought is characterized by a wide range of distribution. Drought can occur all year round in our country. Spring drought mainly occurs in the Huanghuai River basin and its northern regions, and in North China.

The probability of spring drought is about 70%, and there is a saying that "nine spring droughts in ten years". Summer drought is usually divided into early summer drought and low drought. Early summer droughts mostly occur in the north. The drought is a drought during the "dog days" of midsummer, which mostly occurs in the Qinling Mountains.

South of the Huai River to the northern part of South China.

According to the causes of drought, drought can be divided into three types: soil drought, atmospheric drought and physiological drought, among which soil drought is the most important. Whereas, soil drought is mainly caused by insufficient precipitation. The climate of our country is a distinct monsoon climate.

The seasonal variation of precipitation is large, resulting in spring drought in the Huanghuai River basin and its northern areas, and most of the drought in the south of the Qinling Mountains and Huaihe River to the northern part of South China, and in central and southern China.

Autumn drought. Winter drought mainly occurs in southern China and eastern southwest China.

Drought refers to a climatic phenomenon in which the total amount of fresh water is low enough to meet the needs of human survival and economic development, and is generally a long-term phenomenon. It is a constraint on the sustainable development of the economy.

It is one of the important factors of public security and affects all aspects of human socio-economic activities. Drought leads to soil water shortage, which affects the normal growth and development of crops and reduces yields. secondly, it causes a shortage of water resources, difficulties in drinking water for people and livestock, a shortage of urban water supply, and a restriction on urban development. Long-term drought can also lead to the deterioration of the ecological environment. Drought can be divided into soil drought and atmospheric drought, and if both occur at the same time, the damage is more severe.

The drought has caused more and more losses to the country's economic construction and people's lives and property, seriously affecting social and public security, national economic development, and the people's living environment. With the development of the economy and the growth of the population, the losses caused by drought are in absolute terms.

There is a clear increasing trend.

Summary. The climate of China is an obvious monsoon climate, and the seasonal difference in precipitation is large, resulting in spring drought in the Huanghuai River Basin and its northern areas, and most of the drought in the south of the Qinling Mountains and Huaihe River to the northern part of South China, and autumn drought in Central and South China. Winter drought mainly occurs in southern China and eastern southwest China.

The climate of China is an obvious monsoon climate, and the seasonal difference in precipitation in Paishon is relatively large, resulting in spring drought in the Huanghuai River Basin and its northern areas, and most of the areas south of the Qinling Mountains and Huaihe River to the north of South China are dusty and drought, and there are many autumn droughts in Central and South China. Winter drought mainly occurs in southern China and eastern southwest China.

How China's arid zone distribution is unique compared to the rest of the world.

China's drought is characterized by a wide range of distribution. Drought can occur all year round in our country. The spring drought mainly occurs in the Huanghuai River Basin and the area north of Soqin, and the probability of spring drought in North China is about 70%, and there is a saying of "nine spring droughts in ten years".

Summer drought is usually divided into early summer drought and low drought. Early summer droughts mostly occur in the north. The drought is a drought during the "three dog days" in midsummer, which mostly occurs in the Qinling Mountains, south of the Huai River to the north and south of China and leaky stoves.

Droughts can occur in all parts of the country, but the frequency and severity of their occurrence varies. Statistics from the past 50 years show that there are five obvious drought centers in China: (1) Northeast arid region.

The drought in this region mainly occurs in the spring and summer seasons of April and August, and the probability of spring drought is 66%, and the probability of summer drought is 50%. 2) Arid area of the Huang-Huai-Hai Sea (eastern northwest and northern China). With less precipitation and high variability, this area is the largest arid area in China, and the number of droughts also ranks first in the country.

Drought may occur in March and October during the crop growth period, and there will be spring, summer and autumn drought in some areas in a few years, but spring drought is the main one, and spring drought occurs to varying degrees almost every year. (3) Yangtze River Basin. Drought can occur in March and November, but it is mainly concentrated in summer and autumn, with the most chance of drought in July and September, and the greatest damage caused by drought.

4) South China. Drought can occur in this area all year round, but due to the early onset of the rainy season in South China and the frequent typhoon precipitation in summer and autumn, the drought mainly occurs in late autumn, winter and early spring. In most years, the duration of the drought is 3 to 4 months, with the longest being 7 to 8 months.

5) Southwest region. The drought generally starts from October or November of the previous year to April or May of the next year, and lasts until June in some years, but the drought mainly occurs in winter and spring.

It's us humans who do it.

Global warming caused by years of industrial development and production, what GDP, presumably every country is comparing, this is the result of our pursuit of numbers.

As for the published drought information, how much is true or false, I saw on the Internet, there is a rare drought in 130 years, can it be said that it is 130 years, did you go to measure it at that time, let alone before, even most of the surveyors are sloppy now.

Now we are not talking about how rare it is, but how to deal with it.

Somewhat of a factor, as the mainstream reservoir and power station of the south and north, it is impossible not to store water, originally the summer solstice, the whole country, especially in the north, due to climate and environmental factors, there will be a shortage of water supply and drought every year. The Three Gorges Reservoir, as the mother river in the Central Plains, is based on national interests and the main water supply. Even during the drought months, the Three Gorges will not release water for crops, and the operation as a reservoir is to discharge water that exceeds the water level, and if it does not cross the water level, it will store water to protect the city's water supply.

The landlord is wrong, and the landlord hopes that someone with a little knowledge of geography can answer a good answer, which is completely wrong. Before the Three Gorges Dam was built, weren't those people in charge? The opposition was seen as abnormal, and since there was a disaster, the person who presided over the construction of the Three Gorges Dam could not be expected to make a final decision.

It is certain that those who are bent on building dams will have their own justifications, and it is more practical to do their own conclusions than to listen to their justifications.

In general, it is a climate anomaly caused by climate warming, as is the case with the frequent occurrence of giant tornadoes in the United States.

Global climate anomalies are the most fundamental.

First, the temperature in the south is high and the evaporation is strong.

The second is the monsoon climate, and the seasonal distribution of precipitation is uneven.

Third, the surface water leakage of karst landform in southwest China is serious.

Fourth, the middle and lower reaches of the Yangtze River are drought. ～～

The main causes of drought in North China are: low annual precipitation and large cultivated land, resulting in insufficient water sources for agricultural irrigation, resulting in drought; The vertical distribution in the precipitation season is uneven, the precipitation in spring is low, the water demand for the growth of crops is large, and the irrigation water source is insufficient.

The main reasons for drought in southern China are: uneven distribution of precipitation seasons, low precipitation in the drought season, large water demand for active growth of crops, shortage of irrigation water sources, and drought; The crops grown in the southern region are more or less water-intensive and prone to drought.

The main reason for the frequent occurrence of flood and drought disasters in some parts of the north and south of our country.

It is due to the fact that the southern and northern regions of China belong to the monsoon climate zone, and under the influence of the monsoon, the precipitation in the southern and northern regions is extremely uneven in seasonal distribution, and the precipitation variability is extremely large, and there are obvious dry seasons and rainy seasons. And economic activities are highly intensive, and the water consumption for production and living is very large. Bright.

The Tarim Basin is an inland area in the northwest with an arid climate and rich oil and gas resources, especially natural gas reserves, which account for about 1 4 of the total onshore natural gas reserves in the country, and is known as the "treasure land of aridity".

Therefore, c