What is the solar term for boating in Xuyi?

Boarding at Xuyi is the first frost solar term.

Specific introduction

The first frost is one of the twenty-four solar terms and the last solar term in autumn, which means that autumn is coming and winter is coming. As the saying goes, "the first frost kills a hundred herbs." After the first frost, the weather became colder and colder, frost and cold air became more and more frequent, the temperature difference between day and night changed greatly, plants gradually lost their vitality, and the earth was bleak.

It is worth noting that the first frost does not necessarily mean "frost". Because in meteorology, the first frost in autumn is generally called the first frost or the first frost, and the last frost in spring is called the "final frost" or "final frost"; The interval from the last frost to the first frost is a frost-free period.

However, the ancients did not have such advanced observation instruments and big data calculations as modern times, but according to experience, the first frost (northern region) generally appeared after the solar terms, so it is more accurate to name the last solar term in autumn as the first frost.

Because "frost" is a manifestation of cold weather and large temperature difference between day and night, it is named "first frost" to indicate that "the temperature drops suddenly and the temperature difference between day and night is large". The "first frost" solar term reflects the climatic characteristics of the cold weather, but it does not mean that frost will fall when entering this solar term.

In fact, "frost" didn't fall from the sky. The "frost" is the condensation of water vapor on the ground when it meets cold air due to the change of temperature difference. The first frost solar terms have nothing to do with "first frost".

Change phenomenon

After the first frost, the land was desolate and the leaves of most plants began to wither. Under the influence of low temperature, chlorophyll in leaves was destroyed, showing the color of carotenoids, and most of them began to turn yellow. However, many tree species contain anthocyanins in their leaves, so they gradually turn red.

Among the trees that turn red in autumn, the most famous are maple and cotinus coggygria, and others are Pistacia chinensis, Metasequoia glyptostroboides, sumac, pine and so on. , will present charming colors, so it is also a great blessing to climb high and look far in autumn, enjoy the red leaves and see the forest dyed.

Throughout the ages, there are countless poems about leaf appreciation, the most famous of which is, of course, Du Mu's Mountain Trip: "There are people in Bai Yunsheng, far away in Hanshan Mountain. Stop and sit in the maple forest late, and the frost leaves are red in February. "