The following is an introduction about Oak, 700 words:

Oak, also known as "oak", is a common tree plant, belonging to the genus Oak in FAGACEAE. Oak is an evergreen or deciduous tree with a height of more than 20 meters and a broad crown. Oak bark is grayish brown, branches are stout, and leaves are oval and shiny. Oaks are mainly distributed in temperate regions of the northern hemisphere, such as Europe, North America and parts of Asia.

Oak is a tree species with strong cold tolerance and adaptability, which requires little soil and can grow in sandy soil, stony soil and acidic soil. Oak has a long growth cycle, which generally takes more than 20 years to reach the maturity of logging. Oak wood has a solid texture and beautiful texture, which has high economic value and can be used to make furniture, floors, wood products and so on. In addition, oak is an important forest resource, which can be used for afforestation and forest protection, and plays a certain role in maintaining soil and improving ecological environment.

Acorns are the fruits of oak trees, which are oval or round in shape and about 2-4 cm in diameter. When acorns mature, their shells become hard and brown. There is a seed inside the acorn, and there is a thin film outside the seed, which is light yellow. Acorn is rich in fat, carbohydrate, protein, cellulose and other nutrients, and has certain edible value. In some areas, people will eat acorns or make food with acorns, such as curing, baking and stewing. In addition, acorns can also be used to brew acorn wine, which has a certain market demand.

Oak plays an important role in the ecosystem. Oak is a common forest tree species, which can provide food and habitat for many animals. The leaves and fruits of oak are important food sources for many wild animals, such as squirrels and birds. Oak can also absorb a lot of carbon dioxide and release oxygen, which can purify the air and improve the environment. In addition, the crown of oak trees can play a role in shading and protecting soil, which helps to prevent soil erosion and protect water sources.

Oaks are widely distributed in China, mainly in North China, Northeast China and Southwest China. Oak also has a certain position in the traditional culture of China. Oak is endowed with the symbolic meaning of strength, longevity and stability, and it often appears in some auspicious paintings and literary works. Oak is also one of the traditional agricultural symbols in China. People often judge the progress of climate and agriculture by the growth of oak trees.

In a word, oak is a common arbor plant with important economic and ecological value. Acorns can not only be eaten, but also be used to brew alcoholic products. Oak plays an important role in the ecosystem and plays a positive role in biodiversity and environmental protection. With people's attention to ecological environment and sustainable development, the cultivation and protection of oak trees will become more and more important.