Why is bamboo hollow and why is bamboo hollow

Generally, the structure of plant stems is as follows: the outermost layer is the epidermis, and the inner layer of the epidermis is the cortex, which has some parenchyma and relatively strong mechanical tissues. Further down the cortex is the middle column.

The middle column contains vascular bundles one by one, which is the most important part of the plant stem and plays the role of transporting nutrients and water. The center of the middle column is also the center of the plant stem, which is called the pith. The medulla has large parenchyma cells and is where nutrients are stored.

Whereas, the middle of the stem of monocots such as bamboo is empty. This is because the pith of these plant stems has atrophied and disappeared very early. Originally, the stems of these plants were also solid.

But in the course of long-term evolution, the stem slowly became empty. Stem emptying is good for plants, why?

The mechanical tissues and vascular bundles in the stems of plants are like reinforced concrete as beams in columns, with which the plant can be supported to stand upright without lodging.

We know that with the same amount of material, the empty and thicker pillars are more supportive than the solid and thinner pillars. In the same way, if the stem of the plant strengthens the mechanical tissue and vascular bundles, reducing or even disappearing the soft and weak pith, it becomes a tubular structure. Well, it's both supportive and material-saving.

Monocots such as bamboo are the most evolved plants, so their stems are mostly empty.

Because the solid absorbs more nutrients, the hollow is easy to live!

Because bamboo loves to drink water!

The hollow bamboo gradually atrophies and disappears because of the pith in the center of the stem, becoming hollow. Hollow bamboos can be easily broken, so the bamboos grow together in large clumps to withstand the ravages of violent storms. The stems of bamboo are also solid at first, later in the process of evolution.

Bamboo is born without secondary tissues, and the stem will no longer thicken when it grows to a certain thickness.

Bamboo will bloom.

Bamboo flowering does not bloom until more than 30 years, but it generally dies after flowering due to insufficient nutrients. This kind of plant is generally widely distributed in the southern region, and it is also a relatively common plant in daily life, but it is rarely seen in flowering.

Empty bamboo is a kind of traditional folk game, which is commonly known as hum, bell, bell, etc., and belongs to the traditional toys of the Han people. The typical hollow bamboo is divided into single wheel and double wheel, the hollow bamboo of the double wheel is shaped like a waist drum, made of bamboo or wood, the two ends are two flat round wheels, the wheel is hollow, there are four or five small holes dug on the wheel, the bamboo flute is placed in the hole, and there is a shaft between the two wheels; The single-wheeled hollow bamboo is shaped like a spinning top, with a wheel on one side. Because there is a bamboo flute in the hollow of the wheel, it is called "empty bamboo".

It is popular all over the country, especially in Tianjin, Beijing and other places. <

Empty bamboo is a kind of traditional folk game, which is commonly known as hum, bell, bell, etc., and belongs to the traditional toys of the Han people. The typical hollow bamboo is divided into single wheel and double wheel, the hollow bamboo of the double wheel is shaped like a waist drum, made of bamboo or wood, the two ends are two flat round wheels, the wheel is hollow, there are four or five small holes dug on the wheel, the bamboo flute is placed in the hole, and there is a shaft between the two wheels; The single-wheeled hollow bamboo is shaped like a spinning top, with a wheel on one side. Because there is a bamboo flute in the hollow of the wheel, it is called "empty bamboo".

It is popular all over the country, especially in Tianjin, Beijing and other places.

1. Introduction. Diabolo.

It is disc-shaped, with a wooden shaft, and a bamboo stick tie rope is wrapped around the wooden shaft to pull and shake. There are two types of bamboo: single wheel (one end of the wooden shaft is a disc) and two wheels (one disc at each end of the wooden shaft). There are whistles around the disc, with a large whistle as the bass hole and several small whistles as the treble hole, which are divided into double, four, six and thirty-six rings.

When pulling and shaking the bamboo, each whistle is pronounced at the same time, high-pitched and majestic, and the sound enters the clouds.

2. Shake the bamboo.

Shaking the empty bamboo, is an ancient Han folk amusement activity, a brilliant flower in the Han traditional culture garden. It is prevalent all over China, especially in Tianjin, Beijing, Liaoning, Jilin, Heilongjiang and other places. It is made of bamboo and wood, hollow, hence the name; In the Qing Dynasty, it was mixed with the empty bell, commonly known as the ring gourd; Jiangnan is also called pulling the bell.

It is also called"Emperor Emperor", including another similar bamboo, but turned upside down on the ground called "Earth Emperor". It is most famous for its products produced in Beijing and Tianjin.

3. Principle. When the hollow bamboo rotates, due to the rotation of the hollow bamboo, the atmosphere disturbs the air in the hollow bamboo cavity, and at this time, the air in the hollow bamboo cavity will vibrate and pronounce according to a certain frequency. Because the air column in the two atmospheric chambers is longer, the air column receives little external atmospheric disturbance and low vibration frequency, so the tone emitted is low; The air column in those small air chambers is relatively short, and the air column receives a large external atmospheric disturbance force, the vibration frequency is high, and the tone emitted is high.

In addition, the higher the rotation speed of the bamboo, the greater the atmospheric disturbance force on the air column in the bamboo chamber, and the louder the sound it emits. This is the acoustic principle of the hollow bamboo structure.