In recent years, more and more new tree species have appeared frequently in front of us. Some tree species have brought about a series of ecological problems due to improper introduction. This has led to the introduction of forest trees as one of the focuses of social concern. However, in a recent interview, the reporter learned that many people have some misunderstandings about the introduction of forest trees and the understanding of the introduction of forest trees in China. Exotic tree species are not necessarily quoted from abroad Many people have a misconception that exotic tree species refer to tree species imported from abroad. In fact, according to Wang Zhongran, director of the Chinese Tree Introduction and Domestication Commission, the foreign tree species are usually those species cultivated outside their country of origin, whether domestic or foreign. For example, Acacia and Acacia lanceolata are introduced from abroad, and are known as exotic tree species in South China, but are native species in Queensland, Australia. Cedar is known as exotic tree species in Beijing, and native species in the Himalayan region of origin. Similarly, tree species introduced from other parts of the country, such as Eucommia, Liriodendron, Huashan Pine, and Qiao Song, are all exotic trees in Beijing. It can be seen that exotic trees do not necessarily have to be imported from abroad. The introduction of forest trees is not something that has happened in recent years. Although the introduction of forest trees has attracted widespread attention in recent years, in fact, the introduction history of forest trees in China has been quite long. Wang suddenly said that China is one of the countries in the world that has a long history of farming. The legendary Shennong tasted a hundred herb is a conscious domestication of wild plants. As early as in the Western Han Dynasty, Zhang Huan returned from the Western Regions Walnut and An pomegranate were introduced in ancient China. Trees. In Beijing and other parts of the country, the commonplace hedgehog was imported from North America more than a century ago. However, the introduction of a long time does not change the identity of the alien visitors. Wang suddenly said that for example, many people think that it is a native tree species because it has fully adapted to the environment of the Chinese cultivated area and has been integrated into the natural ecosystem in many areas and will not constitute other components of the forest ecosystem. Biological threats and characteristics of native tree species, but we still can not say it has evolved or can be called a native tree species. The introduction of trees can be done in various ways. Tree introduction refers to the artificial way to put a tree species, subspecies or lower taxonomic unit (including any part of the plant body that can survive and eventually reproduce, or other propagation materials) out of its origin. In other areas, the transfer of this geographical space can take place within one country or between different countries. In the long-term natural evolution process, the bio-distribution of the Earth's surface forms a certain geographical pattern. Plant introduction is to artificially adjust this pattern. For example, Loblolly pine was introduced into the United States as a tree species from the United States. Cuban Caribbean pine was introduced as a subspecies of Caribbean pine from Cuba to South China. Poplar and other asexually propagated species were introduced in the form of clones. Due to the development and application of biotechnology, pollen and other plant organs are also widely exchanged between scientists and research organizations. These are the ways in which modern trees are introduced. Domestication is the key to successful introduction. The concept of light domestication is a mistake. Wang suddenly stressed that domestication is the key to successful tree introduction. He explained that under a new growing environment and artificial cultivation conditions, the process of transforming a tree species or its population from a wild state to a cultivated state is called domestication, with the purpose of making the tree species more suitable and satisfying various human needs. It often takes decades or even hundreds of years. Introduction and domestication are inseparable. The former is a change that spans geographical space, and the latter is a long-term process through time. Although the current criteria for measuring the success of exotic tree species introduction are still controversial, it is generally believed in the international community that exotic tree species can normally grow, develop, and update in a new environment and establish new groups themselves. This exotic tree species has been domesticated. This introduction It is considered successful. It shows the importance of domestication. The native tree species also need to be domesticated. Exotic tree species need to be domesticated. Is native tree species native to domestication necessary? the answer is negative. Because although these tree species lived together with the local population in a region, people saw the trees does not mean that they knew the trees. Starting from the human consciousness, the domestication of trees is a process in which human understanding of trees has deepened. For example, Wang suddenly said that the pine, fir, mulberry, and tea planted in peaches, plums, bamboos, plums, and plantations that we see today in gardens are transformed into plantations through human generations of domestication. Tree species or horticultural species. The proportion of tree species planted now in forest tree species is very small, only about 5%. A large number of forest genetic resources have not yet been exploited, that is, a large number of wild tree species have not yet been domesticated. Not only China, but also other countries in the world, human understanding of natural resources is still very limited.