The origin of the solar term "beginning of winter"?

Problem description:

There is a prize for answering correctly! ! -

Analysis:

The "beginning of winter" solar term is1October 7th or 8th every year, 165438+. In ancient China, people used to regard beginning of winter as winter.

At the beginning of the twenty-four solar terms, it is said that "the foundation is also the beginning" and that "winter is the end and everything is harvested." In fact, China is a vast country.

All winters don't start at the same time except the coastal areas of South China where there is no winter all the year round and the Qinghai-Tibet Plateau where there is no summer in the long winter.

. According to the standard of dividing the four seasons in climatology, in order to

In the second half of the year, when the average temperature drops below 10℃, it is winter, so the statement that "beginning of winter begins in winter" is basically consistent with the climate law in Huanghuai area.

Matches Mohe, the northernmost part of China, and the area north of Daxing 'anling have entered the winter as early as the beginning of September, with Beijing as the capital.

At the end of June, 5438, there was also a scene of winter in+10. The winter in the Yangtze River basin didn't really start until around the "light snow" solar term.

In early winter, the sun has reached the longitude of 225, and the northern hemisphere gets less and less solar radiation. Due to the heat stored on the surface in summer and half a year,

There is still a certain amount, so it is generally not too cold. When there is no wind on a sunny day, there is always warm and comfortable "Xiaoyangchun" weather, which is not only very pleasant.

It is also very beneficial to the growth of winter crops. But at this time, the cold air in the north also has a strong force, often invading the south frequently, and sometimes forming strong winds.

Cold wave weather is accompanied by cooling and rain and snow. Judging from the average situation for many years, 1 1 is the month with the most cold waves. Especially severe cooling.

Abnormal cold and warm weather has a serious adverse impact on people's lives, health and agricultural production. Pay attention to the weather forecast, according to the weather changes and

It is very important to do a good job in human body protection and prevention of cold injury and freezing injury of crops.

Before and after winter, precipitation in most parts of China decreased significantly. Northeast China is frozen, and agricultural and forestry crops enter the wintering period; "Sanqiu" in Jianghuai Area

"Is drawing to a close; Jiangnan is busy planting late-season winter wheat and transplanting rapeseed; On the other hand, South China is the best time to plant wheat in early winter. this

The water condition is closely related to the seedling growth and overwintering of crops. The air in Huanghuai area of North China must average every day.

When the temperature drops to about 4℃, the soil in the field freezes at night and disappears during the day, we should seize the opportunity to water the winter water of wheat, vegetables and orchards to supplement the lack of soil moisture.

Be good at the microclimate environment in the field, prevent "drought to help the cold", reduce and avoid the occurrence of freezing injury. Jiangnan and South China, timely open the field of "high yield"

Clearing ditches and draining water is an important measure to prevent waterlogging and prevent freezing in winter. In addition, after the beginning of winter, the air usually becomes dry and the soil contains

There is less and less water, so the fire prevention work in forest areas should be put on the important agenda.