What caused the drought?

Question 1: What is the cause of drought and what is the harm of drought?

Drought is the first major disaster that harms agriculture and animal husbandry production.

Meteorological conditions affect the distribution, growth, yield and quality of crops, and water conditions are the main conditions to determine the type of agricultural development. Drought has become the most serious meteorological disaster affecting China's agricultural production because of its high frequency, long duration, wide range of influence and great delay. Drought is the main meteorological disaster of animal husbandry in China, which mainly affects pasture and livestock products and intensifies grassland degradation and desertification.

Warm and dry climate will cause other natural disasters.

Drought in winter and spring is easy to cause forest fires and grassland fires. Since 2000, due to the continuous rise of global temperature, the climate in the northern region is relatively dry, the ground temperature of woodland is relatively high, the grass has withered for a long time, and forest underground fires and grassland fires are on the rise.

Drought has further worsened the ecological environment.

(1) The warming and drying of the climate caused the water level of lakes and rivers to drop, and some of them dried up and stopped flowing. Due to drought and water shortage, the supply of surface water is insufficient, so we can only rely on a large number of over-exploited groundwater to maintain residents' lives and industrial and agricultural development. However, the over-exploitation of groundwater has led to a series of ecological and environmental problems, such as the decline of groundwater level, the expansion of funnel area, land subsidence and seawater intrusion.

(2) Drought leads to grassland vegetation degradation. Most of China is located in arid, semi-arid and sub-humid ecological fragile zone. The climate is characterized by the prevailing southeast monsoon in summer, with rain and heat in the same season, and precipitation mainly occurs from April to September every year. Although the rainy season in northern China is also from April to September every year, it is very heterogeneous in space and has the characteristics of ten years and nine droughts. Due to the change of climate and environment and unreasonable human interference activities, vegetation has been seriously degraded. After entering the 2 1 century, the drought has intensified for several years, and the three seasons of spring, summer and autumn are continuous, which is very unfavorable to the fragile ecosystem.

(3) Climate drought has intensified the process of land desertification.

Causes of drought:

Unbalanced water resources

China has more water in the south and less arable land in the north. This imbalance of regional water resources is an important factor for the formation of drought disasters in China.

Less precipitation

Generally speaking, when the precipitation is lower than the average level, drought is prone to occur. In China, the seasonal variation of precipitation in different areas forms the basis of the distribution of seasonal drought-prone areas in China. In the area south of the Yangtze River, the summer monsoon comes early and goes late, and the rainy season comes early and lasts for a long time. If there are few rainfall tickets in July and August, it is easy to produce summer drought. The rainy season in the northeast of North China is from June to September, especially in spring drought and continuous drought in spring and summer. Southwest China mainly depends on the precipitation brought by southwest monsoon, and the dry season is 1 1- April of the following year.

Drought often becomes a serious natural disaster because of its long duration, wide spread and severe famine. Drought can be divided into two interrelated aspects: soil drought and atmospheric drought. The main manifestation of soil drought and climate drought is insufficient precipitation. Therefore, insufficient precipitation is the crux of the drought problem and the root cause of the drought. Precipitation is the key factor that directly affects whether the land is dry or not. The probability of drought is directly proportional to rainfall, but drought is not entirely determined by rainfall, but also related to evaporation and other factors.

Socio-economic aspects

Socio-economic aspect mainly refers to the improvement of water consumption for industrial and agricultural production in China in recent decades. First, the increase of multiple cropping index (the percentage of crop sown area to cultivated area in an agricultural production area within one year) and the expansion of irrigation area have led to the increase of farmland water demand; Secondly, with the increase of winter wheat planting area in northern China, the farmland area threatened by spring drought in the north is further expanded; Third, China's population growth leads to an increase in domestic water consumption, while industrial development leads to an increase in industrial water consumption and water demand. All the above aspects will lead to the formation of drought.

Question 2: As the saying goes, "What does drought cause?" Drought led to locust infestation.

Water, drought and locust are the three major natural disasters in the old society of our country, which have brought quite serious suffering to people of all ages. Moreover, it never rains but it pours. After the drought and flood, locust plagues followed. So, what is the relationship between drought and flood and locust plague? Why does drought cause locust plague? It turns out that the development of things always has certain rules, starting with the biological characteristics of locusts. Although the migratory locust has a variety of feeding habits, it likes to eat grasses and Cyperaceae plants, especially reeds, barnyard grass, red grass and other weeds. Grasshoppers eat Gramineae and Cyperaceae plants faster than other plants, with high survival rate, large size and strong reproduction. Locust spawning is obviously selective to the environment, and it likes to spawn in the environment with relatively solid soil, slightly alkaline terrain, sparse vegetation (coverage between 25-50%) and soil water content 10-20%. Solid soil can promote the development of eggs to a certain extent; The soil temperature changes greatly in sunny terrain, and the eggs develop rapidly; Locusts are afraid of dark and humid environment and like to bask in the sun. Sparse vegetation is beneficial to the habitat of locust pupae and adults.

There are four types of locust areas in China: coastal areas, flood areas, lakeside areas and waterlogged areas. The occurrence and fluctuation of migratory locusts are closely related to hydrological changes. Drought will cause the lake water level to be low or dry, and the floodplain water that the tide can't reach will dry up and the ground will be bare. Due to the large area of the floodplain, there will be a large area of wasteland grass, reeds, thatchs, sedges and other weeds, which will become an environment suitable for locust life and reproduction. At the same time, drought can also inhibit the reproduction of natural enemies of locusts. Locusta migratoria manilensis can multiply in such a favorable environment, and the population increases rapidly, causing a lot of harm. There is also an agricultural proverb in the waterlogged locust area, that is, the locusts spread in pieces after waterlogging. According to Li Guangbo's analysis, waterlogging first refers to the phenomenon that a large area of water accumulated in waterlogged soil area from mid-July to mid-August of the previous year due to heavy rainfall. The so-called post-drought means that there is no rain for a long time in the rainy season from late August to September; Until the accumulated water dries up, the soil water content is still large, and a large area of flooded farmland can not be cultivated, and often only furrow wheat can be planted. Scattered migratory locusts are mostly concentrated in farmland, straw, roadside or grassland in this environment, which leads to a significant increase in the density of summer locusts in the following year, and even a large occurrence; The debris of leeches means that they occur seriously and move in groups.

So drought will cause locust plague.

Question 3: What caused the drought and lack of rain this year? Most of the reasons are caused by global warming. Global warming is a natural phenomenon. Because people burn fossil fuels, such as oil and coal. Or cutting down and burning down forests will produce a lot of carbon dioxide, that is, greenhouse gases, which have a strong permeability to visible light emitted by the sun, a strong absorption to long-wave radiation emitted by the earth, and a strong absorption of infrared radiation from the ground, leading to an increase in the temperature of the earth, that is, the greenhouse effect.

Question 4: What caused the drought and the influence of geomagnetism on the weather? I've read articles about using extremely low frequency to influence the weather, and this aspect still needs to be studied at present. This is the discovery of Russia and the United States, which proves the connection between weather and extremely low frequency. If you are doing this, you can do research and use the extremely low frequency principle for artificial rainfall. Of course, if you have the ability.

If you want to fight drought, you can refer to the following

Charcoal may absorb the water needed by crops, so an experimental field can be set up first, and it can be combined with soil by using its characteristics of water absorption and wetting tendency. Because the water storage rate of charcoal is greater than that of soil, it can store water for crops. In order to reduce the cost, charcoal materials can be processed with corn stalks and other materials, and an experiment can be done first to benefit neighbors.

Question 5: What's the difference between dryness and drought? Dry [shape] (river, pond, etc.). ) There is no water.

Drought usually refers to a climatic phenomenon that the total amount of fresh water is not enough to meet people's survival and economic development. Drought is generally a long-term phenomenon, but drought is different. Only occasional natural disasters, even in areas rich in water resources, will be caused by temporary climate anomalies.

Question 6: Is the weather system that causes high temperature and drought often subtropical high or continental warm high (ridge)? But it should be noted that if a place is located at the bottom or back of a high cliff, there will be no drought and precipitation.

Question 7: What will drought cause? The harm caused by drought is closely related to the growing season of crops, especially the "neck drought" at the booting stage of crops. Crops are most sensitive to water at booting stage. If there is a drought, crops will often be stunted, and empty grain will increase obviously, resulting in a sharp reduction in grain production. As for the drought for several months, seasons or even years, the water level of rivers has dropped, the ponds of rivers, lakes, reservoirs have dried up, agricultural irrigation has no water available, farmland has cracked, crops have died, and grain and oil production has been greatly reduced. What's more, drinking water for people and livestock in rural areas is difficult, and industrial water and urban water are limited, which will also bring a series of social and economic problems, and its harm is no less than floods.

Question 8: Why is there a drought? Causes and countermeasures of drought.

Performance. In terms of natural factors, it is mainly accidental or periodic precipitation reduction, but in recent years, some human activities have also aggravated the imbalance between supply and demand of water. From the perspective of human factors, there are four main reasons for the drought caused by human activities:

1. The population has increased greatly, resulting in an increasing shortage of limited water resources.

2. Forest vegetation is destroyed by human beings, and the water storage function of plants is lost, resulting in the decrease of groundwater and soil moisture.

3. Human activities have caused a lot of water pollution and reduced the available water resources.

4. The serious waste of water resources in China, especially agricultural irrigation, leads to the shortage of water resources. Fortunately, human beings have already started to act. In China, population control, afforestation, pollution control and development of environmental protection industry have become basic national policies. As a big agricultural country, our backward irrigation methods are also changing to efficient and energy-saving irrigation methods.

Question 9: How is the drought formed? Lack of water.

Question 10: What is the cause of drought and what is the harm of drought?

Drought is the first major disaster that harms agriculture and animal husbandry production.

Meteorological conditions affect the distribution, growth, yield and quality of crops, and water conditions are the main conditions to determine the type of agricultural development. Drought has become the most serious meteorological disaster affecting China's agricultural production because of its high frequency, long duration, wide range of influence and great delay. Drought is the main meteorological disaster of animal husbandry in China, which mainly affects pasture and livestock products and intensifies grassland degradation and desertification.

Warm and dry climate will cause other natural disasters.

Drought in winter and spring is easy to cause forest fires and grassland fires. Since 2000, due to the continuous rise of global temperature, the climate in the northern region is relatively dry, the ground temperature of woodland is relatively high, the grass has withered for a long time, and forest underground fires and grassland fires are on the rise.

Drought has further worsened the ecological environment.

(1) The warming and drying of the climate caused the water level of lakes and rivers to drop, and some of them dried up and stopped flowing. Due to drought and water shortage, the supply of surface water is insufficient, so we can only rely on a large number of over-exploited groundwater to maintain residents' lives and industrial and agricultural development. However, the over-exploitation of groundwater has led to a series of ecological and environmental problems, such as the decline of groundwater level, the expansion of funnel area, land subsidence and seawater intrusion.

(2) Drought leads to grassland vegetation degradation. Most of China is located in arid, semi-arid and sub-humid ecological fragile zone. The climate is characterized by the prevailing southeast monsoon in summer, with rain and heat in the same season, and precipitation mainly occurs from April to September every year. Although the rainy season in northern China is also from April to September every year, it is very heterogeneous in space and has the characteristics of ten years and nine droughts. Due to the change of climate and environment and unreasonable human interference activities, vegetation has been seriously degraded. After entering the 2 1 century, the drought has intensified for several years, and the three seasons of spring, summer and autumn are continuous, which is very unfavorable to the fragile ecosystem.

(3) Climate drought has intensified the process of land desertification.

Causes of drought:

Unbalanced water resources

China has more water in the south and less arable land in the north. This imbalance of regional water resources is an important factor for the formation of drought disasters in China.

Less precipitation

Generally speaking, when the precipitation is lower than the average level, drought is prone to occur. In China, the seasonal variation of precipitation in different areas forms the basis of the distribution of seasonal drought-prone areas in China. In the area south of the Yangtze River, the summer monsoon comes early and goes late, and the rainy season comes early and lasts for a long time. If there are few rainfall tickets in July and August, it is easy to produce summer drought. The rainy season in the northeast of North China is from June to September, especially in spring drought and continuous drought in spring and summer. Southwest China mainly depends on the precipitation brought by southwest monsoon, and the dry season is 1 1- April of the following year.

Drought often becomes a serious natural disaster because of its long duration, wide spread and severe famine. Drought can be divided into two interrelated aspects: soil drought and atmospheric drought. The main manifestation of soil drought and climate drought is insufficient precipitation. Therefore, insufficient precipitation is the crux of the drought problem and the root cause of the drought. Precipitation is the key factor that directly affects whether the land is dry or not. The probability of drought is directly proportional to rainfall, but drought is not entirely determined by rainfall, but also related to evaporation and other factors.

Socio-economic aspects

Socio-economic aspect mainly refers to the improvement of water consumption for industrial and agricultural production in China in recent decades. First, the increase of multiple cropping index (the percentage of crop sown area to cultivated area in an agricultural production area within one year) and the expansion of irrigation area have led to the increase of farmland water demand; Secondly, with the increase of winter wheat planting area in northern China, the farmland area threatened by spring drought in the north is further expanded; Third, China's population growth leads to an increase in domestic water consumption, while industrial development leads to an increase in industrial water consumption and water demand. All the above aspects will lead to the formation of drought.