What is the tree known as a living fossil Hurry, hurry, hurry

Ginkgo biloba is a tree with a special style, the leaves are green in summer and yellow in autumn, like an open folding fan, and the shape is unique and beautiful.

200 million years ago, Ginkgo biloba grew everywhere in Eurasia, the oldest tree species in the world. Later, more than 2 million years ago, the Quaternary glaciers appeared, destroying most of the ginkgo biloba, and the remains became plant fossils imprinted in stone. In this catastrophe, only a part of the living ginkgo trees in our country have been preserved, which have continued to this day and have become living teaching materials for the study of ancient ginkgo.

Therefore, ginkgo biloba is the oldest relict plant in the world, and people call it "the world's first living fossil". ”

China is the earliest country in the world to artificially cultivate ginkgo, in 1265 A.D. in the Southern Song Dynasty Chen Jingyi's "Quanfang Beizu", there is a record of ginkgo, earlier than other countries in the world. Ginkgo biloba is a rare longevity tree, many places in our country have found ginkgo trees, especially around some ancient temples and temples, you can often see the big trees planted for hundreds of years and more than a thousand years. Like the famous Huanglong Three Treasure Trees of Huanglong Temple in Lushan, one of them is ginkgo, with a diameter of nearly 2 meters, and the ginkgo of Tantuo Temple in Beijing is more than 1,000 years old.

And the world's longest-lived ginkgo, should also count the big ginkgo in Dinglin Temple in Ju County, Shandong Province, China, the tree is 24 7 meters high, the chest circumference is 15 7 meters, the canopy shade is 200 square meters, it is said that it was planted in the Shang Dynasty, and the natural ginkgo forest can also be found from now on, which proves that our country is the hometown of ginkgo.

Ginkgo biloba trees were introduced to Europe and the United States more than 200 years ago, and many famous botanical gardens are proud to be able to plant ginkgo, the "world's first living fossil".

Ginkgo biloba is the only surviving species of gymnosperms in the Ginkgo family, dioecious. According to the characteristics of ginkgo biloba, such as branch and leaf morphology and fan-like leaf veins, it is different from other more evolved gymnosperms, and is the oldest genus of existing seed plants. When its seeds are ripe, they are orange and yellow like apricots, the outer seed coat is very thick, and the middle seed coat is white and hard, so it is also called "white fruit".

The kernel of ginkgo biloba seeds can be used for medicinal purposes, and has the effects of moisturizing the lungs, relieving cough and strengthening the lungs. Its branches and leaves contain anti-insect toxins, which can prevent insects, so some people put a ginkgo biloba leaf in the book to get rid of the book silverfish. Ginkgo biloba also contains a chemical called ginkgo flavonoids, which can lower cholesterol, improve blood circulation in cerebral blood vessels, and have the effect of preventing and treating cerebral arteriosclerosis and thrombosis.

Therefore, Ginkgo biloba extract is a new group of cardiovascular and cerebrovascular health care drugs in the world, especially in the European and American markets.

Living fossil plants" - alder.

In terms of the oldest relict plants, the one that is most qualified to be called a "living fossil" should be Alder.

Alder (alsophila spinulosa (hook.)Tryon) belongs to the more primitive vascular plant Pteidophyta and Cyatheaceae. Most of our common ferns are relatively short herbaceous plants, but alder is a large fern, because of its tall plant shape, straight stem, petiole with skin thorns, so it is also called "tree fern" or "spiny alder".

Alder is a very old relict plant that originated about 400 million years ago, and its fossils have been found in Jurassic strata in Poland, India and Korea. In the long process of geohistorical evolution, the alder still stands in the world with its majestic posture hundreds of millions of years ago, so it is also called "living fossil plant".

Of course, China's ancient tree species ginkgo biloba and metasequoia are also known as living fossils of plants on many occasions. If it's more comprehensive, you can list alder, ginkgo biloba, and metasequoia.

It's ginkgo, our science books say it! 1

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Ginkgo biloba: Upstairs is right, pull.

Ginkgo biloba and metasequoia, you can consult the China Science Network.

1. Ginkgo, ginkgo tree is also known as white fruit tree, also known as duck's foot tree or Gongsun tree in ancient times. More than 270 million years ago, the ancestors of ginkgo biloba began to appear, and it was still a higher plant compared to the ferns that were all over the world at that time. More than 170 million years ago, ginkgo biloba has been spread all over the world like the dinosaurs that dominated the world at that time, and later, most of the ginkgo biloba became extinct like dinosaurs, and only a little bit was preserved in some parts of our country, and it has been passed down to the present and become a rare treasure.

2. Metasequoia, metasequoia is a deciduous and coniferous tree. It is one of the rare and precious plants in ancient times, and is a first-class protected plant in China.

3. Ginkgo biloba is the oldest relict plant among the existing seed plants in the world, and it is a special tree species in China and is known as a "living fossil". In addition, silver fir and metasequoia are produced in the Permian; Alder, grate and tricuspid cedar flourished in the Mesozoic; The dove tree and the incense tree are relict tree species of the Tertiary period, and these plants are called living fossils.

The tree species that is known as a living fossil is the ginkgo tree.

Ginkgo biloba is a rare tree species relict in the Mesozoic Era, which is a special product of China, born in the natural forest at an altitude of 500-1000 meters, acidic (pH value yellow soil, well-drained zone), and often mixed with coniferous and broad-leaved tree species such as cedar, quince, and blue fruit tree, and grows vigorously. It is cultivated in gardens from Korea, Japan, Europe and the United States.

Ginkgo biloba is a tall deciduous tree with a straight trunk, beautiful tree shape, strong disease resistance, high pollution resistance, and a long lifespan, almost thousands of years. It is loved and favored by the world for its vigorous physique, unique character of leaky tung eggplant, strange wind bones, high ornamental value and economic value.

Cultivation techniques

Due to the slow growth cycle of ginkgo biloba, the nutrients and light conditions it needs are relatively sufficient, so the site conditions should be selected as far as possible in a location with high terrain, convenient transportation and good drainage capacity. The seedling orchard planting ginkgo should also pay attention to the selection of a garden with a thick soil layer, which generally requires the soil thickness to be more than 1 meter.

The planting time of ginkgo biloba trees is affected by temperature, location, etc., and different planting times need to be determined according to different regions. For the area south of the Yangtze River, the time of ginkgo planting can be selected in the late autumn and early winter, and the land in the south still has a certain ground temperature in winter, which can basically ensure the recovery of root damage after ginkgo planting, and at the same time promote the rapid growth of ginkgo biloba in the following year.