Shulou(Shulou.com)12/24 Report--

In the twinkling of an eye, it is November, and although the meaning of autumn and winter in South China is not very obvious, looking at all parts of the country, especially in the north, we have already felt a series of differences brought about by seasonal changes.

In nature, this change is most pronounced in plants. After all, thousands of them are alive around us, especially their leaves.

1. Why are the leaves mostly green? In fact, only for plants themselves, there is no way to quickly change their spatial location through "movement" in order to find food and adapt to changes in the climate and environment, in order to obtain energy for life activities such as growth and development, to maintain normal survival needs, we must rely on and use solar energy.

The process of converting solar energy into energy needed by plants is called photosynthesis, which is the source of most of the energy of plants themselves. If you want to use solar energy, you must first be able to absorb solar energy, and the pigment in plant leaves that can absorb visible light is the most important weapon.

Liquidambar formosana, Mushroom family Liquidambar formosana is a deciduous tree generally speaking, the highest content of various pigments in the leaves is chlorophyll. It mainly absorbs blue-purple light and red-orange light, while green light is not absorbed by it, but is constantly reflected or penetrated by the leaves, so most of the leaves we see are green.

Five-leaf Dijin, a woody vine of the genus Corydalis in the grape family. 2. Why can the leaves change color? As mentioned earlier, the green of leaves is mainly affected by chlorophyll. In other words, the amount of chlorophyll will determine the change of leaf color.

However, chlorophyll is not a stable compound, and plants need to rely on sunlight and warm climates to maintain their chlorophyll content. Moreover, in addition to chlorophyll, there are carotenoids such as lutein and carotene in the leaves, as well as other pigments, such as a special pigment called anthocyanin, which is a "chameleon" that tends to be red in acid and blue in alkali.

There are many studies on deciduous trees of Metasequoia glyptostroboides. Many studies have shown that external environmental factors such as light, temperature, water and other external environmental factors can affect physiological and biochemical processes such as photosynthesis, water metabolism and mineral metabolism in plants. and then cause changes in the proportion of various pigments in plant leaves.

Populus euphratica, Populus euphratica deciduous trees such as with the arrival of autumn, the day time becomes shorter, the temperature gradually decreases. Plants feel the climate change from autumn, so the synthesis of chlorophyll in the leaves is slowly less than the amount of decomposition until it disappears. When the proportion of other pigments in the leaves increases gradually, the leaves begin to change color.

Sapium sebiferum, a deciduous tree of the genus Euphorbiaceae. In addition, in order to avoid the risk of frostbite, reduce the loss of energy, and not consume a lot of water in an increasingly dry environment, plants choose to abandon these leaves soon after the leaves change color, so the fallen leaves are produced.

Acer, Acer is a deciduous tree of the family Acer. 3. Why are the leaves different in color? Plant leaves due to a variety of reasons caused by the gradual disappearance of green, often become gold, yellow, orange, brown, purple, red and other bright colors. All this is due to the various pigments in the leaves.

One is chlorophyll, which, as mentioned earlier, makes leaves look green. The second is carotenoids, which mainly contain two kinds of pigments, lutein and carotene, the former is yellow and the latter is orange. Their effect is similar to that of chlorophyll, but not very important in photosynthesis. The third is anthocyanin, also known as anthocyanin, which is a water-soluble natural pigment widely found in plants. It has no color, reddish in acid and blue in alkali.

Liriodendron mandshurica, Liriodendron mandshurica deciduous trees enter the autumn after October, due to the decrease of cloud cover, resulting in high light intensity, long sunshine time, large temperature difference between day and night, low relative humidity and relative temperature and so on. all these are conducive to photosynthesis and the accumulation of photosynthates, and the degradation of photosynthates is conducive to the increase of anthocyanins and tannins, which is also conducive to the increase and maintenance of anthocyanins.

Betula platyphylla, Betula platyphylla deciduous trees appear light green or yellowish green when the chlorophyll in the leaves is not completely lost, brown when the leaves contain anthocyanins and residual chlorophyll, and orange when the leaves contain anthocyanins and carotenoids.

Ginkgo, Ginkgo biloba, Ginkgo biloba,

Acer truncatum is a deciduous tree of the genus Acer in the disease-free family. In addition, the color changes of the leaves of some plants are synchronous, while the changes of the leaves of some plants are different, even on the same leaf, such as ginkgo, Acer truncatum and so on.

Of course, in addition to the main pigment that affects the color of the leaf, there are many other factors that can also cause the color of the leaf to change. Such as temperature, humidity, PH value, and even soil conditions, composition and so on.

Perhaps, for friends in the north, even if autumn does not have the flowers of spring, the lush of summer and the snow of winter, it is a romantic and tonal season. Living in South China, I express my envy.

This article comes from the official account of Wechat: village pick-up Flowers (ID:cunlishihua), author: WingJyunGu

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