What are the phenological characteristics of slight cold solar terms?

The phenological characteristics of slight cold solar terms include the increase of freezing phenomenon and the withering of plants.

Increased freezing phenomenon: due to the sharp drop in temperature, a large number of water bodies such as rivers, lakes and rice fields began to freeze during the slight cold. In the north, rivers and ponds are often covered with thick ice, and people can go fishing and skating on the ice in winter.

Plant withering: As the temperature drops, many plants go into dormancy, leaves will fall off one after another, trees will be withered, some flowers and crops will wither during this period, and the fields will become bleak.

Animal Hibernation: In order to resist the cold winter, many animals begin to hibernate, reduce their activities, or even stop coming out of their holes, but spend the whole winter quietly in underground, caves or other hiding places.

Differences in different areas of slight cold

According to the statistics of climatic data, the coldest time in most parts of northern China is June 5438+1mid-October (June 5438+00-20); The annual slight cold solar term starts from 65438+1October 5-7, one solar term is about 15 days, and the middle section is just within the slight cold solar term; So for most parts of the north, slight cold is indeed colder than severe cold.

But for most parts of the south, it is the coldest in the great cold solar terms; The severe cold solar term generally starts from 65438+1October 20th (65438+1late October), which is the coldest time of the year in the south.

The slight cold in northern China is colder than the severe cold, because there is relatively little "residual heat" on the surface, which has been released by the slight cold. At this time, the days are short and the nights are long, and the cold air is powerful, which minimizes the temperature. In the great cold, the sun's light and heat increased slightly, so the temperature also increased slightly.