The largest tree in the world

The largest tree in the world is the American sequoia. The "World's Greatest" sequoia tree now stands in the United States, with a height of 83.79 meters and a circumference of 34.93 meters. The bark of the redwood tree alone is more than 60 centimeters thick. Some estimate that the total weight, including its roots, may be more than 6,700 tons.

Sequoia trees are descendants of the huge evergreen trees that grew during the dinosaur period. They like humid living environments. They take 400 years to mature. Some trees have lived for more than 2,000 years. Their towering canopies are covered with several trees. A carpet of silence formed by centuries of fallen leaves. Their thick bark makes them less susceptible to fire, but landslides and strong winds can knock down older trees, and Indians used the fallen trees to make canoes or build homes. Commercial logging began during the gold rush era, and sequoia trees continue to be harvested, causing controversy among timber companies and environmentalists.

The best-growing sequoias are in Sequoia National Park on the northern coast of California, and the largest giant sequoias are in Giant Sequoia National Park in central California. Redwoods and giant sequoias are extremely high-quality woods that are used in a wide range of applications, including house building, furniture, railroad ties, and fence posts. It grows tall and straight, rarely scars, has fine wood grain, is bright and hard, and the combination of natural oils and rosin makes it almost antiseptic and resistant to attacks by termites and other insects.

In the second half of the 19th century, these trees were over-exploited and were in danger of extinction due to their limited distribution range. Although the National Park Service continues efforts to annex remaining forest lands within existing protected areas, mining continues today.

Sequoia National Park is dominated by redwoods, the tallest surviving tree species. Sample trees are usually 91 meters high, and one tree was once measured to be 112.1 meters high. Such trees often grow on sunny slopes and valleys in humid coastal zones. They are submerged in warm sea fog drifting from the Pacific Ocean almost every day. The trunk is wrapped by thick, tough, fire-resistant bark. Young saplings tiller branches along the entire tree body, but as the tree grows older, the lower branches gradually fall off, forming a dense upper canopy. The canopy rejects almost all the light directed to the ground. As a result, only in the relatively sparse bottom layer of the forest, ferns Only in shade can plants survive, growing together with the occasional redwood saplings. Sequoia is a plant that produces a lot of seeds, but only a few seeds germinate successfully, and even when they do, they have to contend with low light levels. Under natural conditions, the slow renewal rate is already sufficient as the mining rate increases, and new trees to replace the felled old trees do not grow fast enough.

The sequoia can claim the title of the tallest tree, while the giant sequoia is the largest tree and indeed the largest living organism. Giant sequoias can live up to 4,000 years, second only to the miscanthus pine. This tree species can be found in the desert mountains of the Sierra Nevada. Some trees are known to be more than 4,900 years old. The giant sequoia can grow to about 95 meters, with a tree trunk diameter of 5 to 11 meters. The largest giant sequoia, General Sherman, is about 4,000 years old and weighs about 3 million kilograms. In addition to the mystique of the trees, the forests of Sequoia and Giant Sequoia National Park are important to many species of animals, including moose, elk, black bears, beavers, and white-tailed and black-tailed deer.

Sequoia is also called Sequoia, and its trunk is rose-like deep red. It grows extremely tall, reaching a mature height of 60 meters to 100 meters. Sequoias also have a particularly long lifespan, with many being 2,000-3,000 years old, and even ancient trees that have grown for 5,000 years. Sequoia grows fast, has a high survival rate, excellent material, and strong ability to avoid pests and fire. It is recognized as one of the most valuable tree species in the world. After the redwood matures, the uppermost 30 meters will have lush branches, like a huge open umbrella, while there will be no side branches below 30 meters.

Fossil records show that giant sequoia is a representative plant of the Jurassic period from 208 million to 144 million years ago, and was distributed over a vast area of ????Beiping. Today they grow in a smaller area, confined to an area of ??about 450 square kilometers from the southern tip of the Sierra Nevada Mountains in California north to the Klamath Mountains in southern Oregon. Redwoods mostly grow on sunny slopes and in valleys along humid coastal areas, and are submerged almost every day in warm sea fog drifting in from the Pacific. The trunk is wrapped in thick, tough, fire-resistant bark.

Young saplings have tillering branches along the entire length of the tree, but as the tree ages, the lower branches gradually fall off, forming a dense upper canopy. The tree crown absorbs almost all the light that reaches the ground. Only in the relatively sparse forest bottom, vines and shade-tolerant plants can survive, growing together with the very rare redwood saplings. Sequoia is a plant with a high seed yield, but only a small number of seeds can germinate successfully, and even after germination, they have to contend with low light intensity. Under natural conditions, the slow renewal rate of redwoods can maintain the continuation of the population. However, with the increase of human logging, the area of ??redwood forests is continuously decreasing.

There are three redwood trees in the redwood forest along the Redwood River in the park, which are considered to be the tallest in the world. The tallest one was discovered by the National Geographic Society in 1963. The height measured at that time was At more than 112 meters, it is the tallest tree on record.

There are many hemispherical burls on the trunks or branches of redwood trees. The real value of these burls is not that they can be used to make crafts or wooden bowls, wooden plates, etc., but that they can continue the red color. The life of a cedar. If a redwood is broken by the wind, killed by fire, or cut down, hundreds of seedlings will develop from the tumor tissue and be supplied with nutrients by the tree's root system. Before long, the graceful young redwood trees will form a circle around the "parent tree."

The fate of Sequoia has always been bumpy and unfortunate. Since the mid-19th century, human beings have continued to cut down redwood trees. Especially since the 20th century, large tractors and chainsaws have exerted their logging power, causing large areas of redwood forests to be destroyed. In the 1960s, a survey by the National Burial Society of the United States found that only 15 of the 8,000 square kilometers of virgin redwood forests had not been cut down. In 1968, US President Johnson signed a decree officially establishing the Sequoia National Park with an area of ??more than 230 square kilometers. In March 1978, President Carter signed a decree to transfer nearly 200 square kilometers of redwood forest in private hands to Sequoia National Park. At the same time, some pastures, oak forests and other virgin forests were also included in the national park.

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