What is the phenological significance of summer solstice?

Summer solstice phenology refers to the periodic changes of organisms' long-term adaptation to temperature conditions in this solar term, and the formation of the growth rhythm corresponding to it is also closely related to phenology. This issue of the Old Yellow Calendar will show you the phenological significance of the summer solstice.

Phenology of summer solstice: On this day of summer solstice, antlers are released, cicadas begin to sing on the fifth day, and Pinellia ternata is born on the fifth day. The solstice in summer is the turning point of Yin and Yang in heaven. When heaven and earth are in harmony, the extremes of things will be reversed, and the extremes of things will be reversed. After the summer solstice, creatures that like shade on the earth began to appear, while those that like sunlight began to decrease.

In ancient China, the summer solstice was divided into three stages: "The antlers in one stage were dissolved; Second, wait for cicadas to start singing; Waiting for Pinellia ternata. "

Although elk and deer belong to the same family, the ancients thought they belonged to yin and yang. Deer' horns face forward, so they belong to Yang. In the summer of solstice, Yin Qi was born, and Yang Qi began to decline, so the front antlers began to fall off. However, the elk is cloudy, so it falls at the corner of the winter solstice; However, after the summer solstice, the male cicada will flap its wings and sing. Pinellia ternata is a shade-loving herb, named after it was born in swamps or rice fields in midsummer.

It can be seen that in the hot summer, some yin-loving creatures began to appear, while positive creatures began to decline.

Climatic characteristics of summer solstice: Convective weather: After summer solstice, the ground is heated strongly and the air convection is strong, and thunderstorms often form in the afternoon to evening. This kind of hot thunderstorm comes and goes, and the rainfall range is small. People call it "dividing fields in summer and rain".

Rainstorm weather: In most cases, during the "summer solstice" period, the middle and lower reaches of the Yangtze River and the Jianghuai basin are rainy seasons. Frequent rainstorms can easily lead to floods and even threaten people's lives and property. Attention should be paid to strengthening flood control work.

Meiyu in Jianghuai: The summer solstice season is the "Meiyu" season in Jianghuai area. At this time, it is the yellow ripening period of plums in Jiangnan. The air is very humid, where cold and warm air masses meet and form a trough of low pressure, leading to rainy weather.

Hot weather: Summer solstice, like winter solstice, is a solar term reflecting seasonal changes. Astronomy stipulates that the summer solstice is the beginning of summer in the northern hemisphere. From summer to the future, although the direct point of the sun began to move from the Tropic of Cancer to the south, the days in the northern hemisphere began to shorten gradually, and the noon sun height in the Tropic of Cancer and its northern region began to decrease day by day, but the heat radiated by the sun to the ground was still more than the heat radiated from the ground to the air, so the temperature will continue to rise in the future, so there is a saying that it will not be too hot in summer solstice.

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