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How is spring formed?
Also known as spring, it is the first season of the year. In the northern hemisphere, it is March, April and May in the solar calendar. In the southern hemisphere, it starts in September and ends in 1 1 month, such as Australia. In climatology, the average daily temperature in beginning of spring has passed 10℃ for five consecutive days. In spring, the climate is warm and mild, and there is less rain in most parts of China. Everything is full of vitality and the climate is changeable, from warm to cold. In spring and March, it is said that the world is born, everything is glorious, lying late and getting up early, walking (walking) in the court, and walking slowly (meaning unrestrained) to do life. Living without killing, giving without taking, rewarding without punishment, this is the response of spring and the way to keep fit. Otherwise, it will hurt the liver, it will be cold in summer and there will be few elders. —— Huangdi Neijing —— [Edit this paragraph] Introduction Spring Sun is named after its mild and beautiful sunshine. Chen Ziang's poem "Every day when you don't return, it's dusk in spring." It's a poem about Chunyang. The laudatory name of spring. Li Bai, a poet in the Tang Dynasty, wrote the poem "Spring calls me to smoke". Fangchun is named after the sprouting of vegetation, the appearance of herbaceous plants, lush green grass and blooming flowers in spring. Lu Ji's poem "Strong heart in autumn, beautiful clothes in spring". Write the characteristics of Fangchun into the landscape. Stupidity in ancient times, "spring" and "stupidity" are homonyms, and when spring comes, insects move, and all shapes and sounds can be heard. Youth is named after the green vegetation in spring. Du Fu's poem: "In that green spring day, I sang loudly, I drank heavily, and that green spring day took me home". The sun is respected for its bright spring sunshine. In Hua Guangsheng's Collection of Folk Songs in Qing Dynasty, there is a saying: "Snow is shining in spring": "On a sunny day, the wind is swaying and the willows are swaying, blending". Sanchun is called "Sanchun" because spring includes January, February and March. Meng Jiao's poem: "Only an inch of grass grows, and three wisps of spring scenery are a little sentimental". According to folklore, Jiuchun is called Jiuchun because there are ninety days in spring and ten days in spring. The poet Ruan Ji has a poem: "Strange to say, if it is in September, the rock will break like autumn frost." In addition, there are more than 20 appellations such as "Yang Festival", "Zhao Festival", "Yun Festival", "Shu Festival" and "Ling Lun", which are limited by space and will not be detailed one by one. (Xiao Honghaimei's series is taken from the 4th issue of Applied Writing, 1997, exploring the origin of spring) [Edit this paragraph] Six solar terms of spring beginning of spring: beginning of spring means the beginning, and beginning of spring means the beginning of spring. Since the Qin Dynasty, China has always regarded beginning of spring as the beginning of spring. Beginning of spring is divided from astronomy, but in nature and people's minds, spring is warm and flowers are fragrant. Spring is growth, cultivation and sowing. In climatology, spring refers to the period when the average temperature is between 10℃ and 22℃. Speaking of beginning of spring, people obviously feel that the days are getting longer and the sun is getting warmer. Temperature, sunshine and rainfall are often at the turning point of the year and tend to rise or increase. The growth of crops in early spring is accelerated, and the water consumption for bolting rape and jointing wheat is increased. Irrigation and topdressing should be done in time to promote growth. Agricultural proverbs remind people that it rains in early spring, get up early and go to bed late. "Da Chun has also begun to prepare for farming. Although it is spring, most parts of South China are still very cold. " Spring snow comes too late, so it flies in the Woods. "... these climatic characteristics should be taken into account when arranging agricultural production. Where is the information that people often look for in spring? The buds protruding from the wicker are "softer than gold and softer than silk"; The eager grass in the soil is waiting for "they grow taller in the spring breeze"; In order to win a new harvest, people who work hard in the fields are creating real spring with their hands. Rain: It began to rain and gradually increased. The rainy season means that it begins to rain and the rainfall gradually increases. In the Yellow River valley, the birthplace of the 24 solar terms, it was cold before the rain, but it was snowing and raining unpleasantly. After the rain, the temperature can generally rise above 0℃, with less snow and more rain. However, in the warm south, even in the dead of winter, rainfall is not uncommon. The average temperature in most parts of southern China in this period is above 10℃, peaches and plums are in bud, and cherries are in full bloom. It is indeed a climatic spring. In addition to a few years, the frost period has come to an end. It is timely to graft fruit trees and plant trees. After a dry winter, there are many droughts in spring all year round in South China, especially in the western part of South China, where "spring rain is as expensive as oil". In agriculture, attention should be paid to moisture conservation and timely irrigation to meet the water supply at the jointing and booting stage of wheat and the critical period of bolting and flowering of rape. The mountainous area of the northwest plateau is still in the dry season, with low temperature and high wind speed, which is prone to forest fires. In addition, the invasion of cold wave will cause strong cooling and snowstorm, which will do great harm to the old, weak and young animals. These should pay special attention to prevention. Sting: Sting means hiding. Sting refers to the sudden movement of spring thunder, which awakens the hibernating animals in the soil. By the time of the earthquake, most parts of China had entered the busy season of spring ploughing. Really: the season waits for no one, and every moment is worth a thousand dollars. In most areas, the average temperature of scary solar terms is generally 12℃ to 14℃, which is more than 3℃ higher than rainy solar terms, and it is the solar term with the fastest annual warming. The sunshine time has also increased significantly. However, due to the alternation of cold and warm air, the weather is unstable and the temperature fluctuates greatly. In the Yangtze River valley in the southeast of South China, the temperature in the warning period is stable above 65438 02℃ in most years, which is beneficial to the sowing of rice and corn. The average daily temperature in other areas is lower than 12℃ for more than three consecutive days, so it is not allowed to sow blindly early. Although the temperature rises rapidly, the increase of rainfall is limited. The total rainfall in central and northwest South China is only about 10 mm, and spring drought often begins after winter drought all the year round. At this time, the booting stage of wheat and flowering stage of rape are in a period of high water demand and are sensitive to water demand. Spring drought often becomes an important factor affecting the output of Koharu. Afforestation should also consider this climate feature, plant logistics and water, and strive to improve the survival rate of saplings. Equinox: Equinox means equal share. The vernal equinox means that day and night are equally divided. After the vernal equinox, the overwintering crops in most parts of southern China entered the spring growth stage. In central China, there is an agricultural proverb, "Wheat starts at the vernal equinox, and every moment is worth a thousand dollars". The temperature in most parts of the south continues to rise, but generally it doesn't rain as fast as the vernal equinox. In late March, the average temperature in northern South China is mostly 13℃ to 15℃, and in southern South China it is mostly 15℃ to 16℃. Most of the plateau has been melted by snow, and the ten-day average temperature is about 5℃ to 10℃. Most areas in South China, such as river valleys, have the highest temperature, with an average of 18℃ to 20℃. In the south, except for the marginal mountainous areas, the average daily temperature rose steadily to above 12℃ in 1978, which is beneficial to planting crops such as rice and corn, and is also very suitable for afforestation. However, before and after the vernal equinox, there is often a strong cold air intrusion in South China, and the temperature drops obviously, as low as 5℃. Sometimes a small stream of cold air comes one after another, forming a low temperature and rainy weather that lasts for several days, which is not good for agricultural production. According to this feature, we should make full use of the weather forecast, grasp the cold tail and warm head, and sow in time. Tomb-Sweeping Day: On April 4th or 5th and 6th every year, folk customs sweep graves on this day. Qingming is a solar term representing phenology, which means sunny weather and lush vegetation. Tomb-Sweeping Day has folk customs such as climbing mountains, eating cold food and sweeping graves. As the saying goes, "Snow breaks Qingming and frost breaks Grain Rain. "When the weather is fine, the climate in South China is warm and the spring is strong. However, before and after Tomb-Sweeping Day, cold air still invaded from time to time, even making the average daily temperature lower than 12℃ for more than three consecutive days, resulting in rotten seedlings of middle rice and dead seedlings of early rice. Therefore, it is necessary to avoid warm tail and cold head when sowing and transplanting rice. In the northwest plateau, livestock are weak under the influence of severe winter and insufficient forage, and it is necessary to guard against the harm of strong cooling weather to old, weak and young livestock after spring. " "It rains in succession during the Qingming Festival" is a portrayal of the spring rain in the south of the Yangtze River by Du Mu, a famous poet in the Tang Dynasty. But in some areas, this is not the case. Especially in the western part of South China, it is often in the spring drought period, and the rainfall in early April is generally only 10 to 20 mm, which is less than half of that in the south of the Yangtze River. Although there are many spring rains in eastern South China, the rainfall in early April is generally only 20 to 40 mm, so natural precipitation is not enough for agricultural production, so it must be replenished by storing water years ago. In addition, May-June is the month with the most hail in a year, so the prevention of hail disaster should be strengthened. Grain Rain: Rain makes a hundred valleys. With sufficient and timely rainfall, cereal crops can thrive in Grain Rain season in southern China. "Young flowers are falling, cuckoos are crying at night, peonies are blooming and cherries are ripe. The natural scenery tells people that it is late spring. At this time, the temperature in the south rises rapidly. Generally, in late April, except for parts of northern and western South China, the average temperature has reached 20℃ to 22℃, which is more than 2℃ higher than that in mid-April. In the eastern part of South China, there is often a high temperature above 30 for a day or two, which makes people feel very hot. Low-altitude valley areas are used to enter summer. The climate characteristics of high temperature in south China in spring are beneficial to the early cropping cultivation measures in Da Chun. The suitable planting temperature of Polygonum cuspidatum is 65438 08℃ to 22℃, which can be satisfied at this time. The experience in the old arid areas in southern China has proved that planting Osmunda japonica early in Grain Rain can seal vine leaves before summer drought, enhance drought resistance and achieve high and stable yield.

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