Characteristics of Climate Change in Tomb-Sweeping Day

"There are many rains during the Qingming period, and pedestrians on the road want to break their souls." This famous poem by the poet Du Mu is no stranger to many people. However, this poem also vividly describes the beautiful climate characteristics of Tomb-Sweeping Day after the rain in the 24 solar terms. In addition, Tomb-Sweeping Day also marks many climate and seasonal changes. Let's look at the characteristics of climate change in Tomb-Sweeping Day.

Characteristics of Climate Change in Tomb-Sweeping Day

Qingming is a solar term representing phenology, which means sunny weather and lush vegetation. As the saying goes, "Qingming breaks snow, Grain Rain breaks frost." When the weather is clear, 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, so it is necessary to guard against the harm of strong cooling weather after spring to old, weak and young livestock.

1, Tomb-Sweeping Day-a portrayal of the spring rain in the south of the Yangtze River.

"There are many rains 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. In particular, the western part of South China 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.

Rainfall in the middle and lower reaches of the Yangtze River increased significantly. Except for the eastern coast, the average rainfall in April in most areas of the south of the Yangtze River is above 100 mm. If the cold air is strong, there will be low-temperature rainy weather with the daily average temperature below 10℃ for more than three consecutive days, and insufficient sunshine will seriously affect the growth of warm crops such as early rice and cotton. South China is located in the south, close to the ocean, and when it is affected by the front formed by the intersection of cold and warm air, heavy precipitation begins to appear, which is called the pre-flood season in South China. When the thermal convection in the rain belt develops vigorously, there will be strong convective weather such as thunderstorms and heavy rain, which is worthy of vigilance.

2. Tomb-Sweeping Day-the busy scene of spring ploughing.

During the Qingming period, the average daily temperature in most parts of the country has risen to above 12℃ except the northeast and northwest regions. From north to south to the inside and outside of the Great Wall, there are busy scenes of spring ploughing everywhere. "In the Qingming Festival, the wheat grows for three days", the wheat in the south of Huanghuai is about to start heading, the rape has blossomed, and the wheat in the northeast and northwest regions has also entered the jointing stage. In the later stage, we should pay close attention to fertilizer and water management and pest control. Dry farming in the north, early and middle rice in the south of the Yangtze River is in a suitable season for mass sowing, so we should seize the opportunity, seize the sunny day and sow early. Pear blossoms are getting clearer and clearer. At this time, when many kinds of fruit trees enter the flowering stage, attention should be paid to artificial pollination to improve the fruit setting rate. Early rice planting in South China should be cleaned up and fertilized in time. Corn, sorghum and cotton will also be planted everywhere. "Before tomorrow's tea, there will be two buds", and the new buds of tea trees will grow vigorously, so attention should be paid to pest control; Famous tea producing areas are mined one after another, and strict scientific mining is needed to ensure the yield and quality.