There is a misunderstanding of large-scale greening

The hosting of the 2008 Olympic Games in Beijing has made the task of building the ecological environment of the capital and our country more difficult. The speed and quality of afforestation and beautification are also more demanding and stricter. Recently, Beijing and other places have accelerated the speed of afforestation and beautification, and have achieved remarkable results. However, at the same time as rapid development, there are also some problems that affect afforestation and beautification, and may even have adverse effects on the future. Professor Shen Ruixiang and Yang Wang of the Beijing Forestry University, based on their in-depth investigations and researches, proposed suggestions for resolving the problems in Beijing's large-scale afforestation. They were highly valued by the leading comrades in Beijing, and the mayor of Liu Qi specially gave instructions. Planting trees is not as big as possible. In order to speed up the process of afforestation and beautification, the effect will be seen in the short term. Some units and departments have asked to plant trees as much as possible. However, Prof. Shen and Prof. Yang reminded that planting big trees should not become a universal and regular afforestation and beautification but a special behavior under special conditions and special technical guarantees. Do not misunderstand "big tree" as big as possible, nor can it be misinterpreted as "old tree." Nor should we adopt the simplistic approach of “removing the east wall and complementing the Western Wall” to dig large trees so as to avoid the adverse consequences of “green this piece and baldness”. The two professors pointed out that because of the complex factors such as technology, timing, and tree physiology, the survival rate of planting big trees is rather low, and it is often laborious, costly, time-consuming, and error-prone. Some units have actually dug large trees from the mountains to plant in the urban areas, destroying the ecological environment of the mountains, and it is difficult for the transplanted trees to survive. The transplanting of old trees must be more careful. The old tree is not easy to survive. Even if it is planted, it will not live long. Only taking into account local effects, regardless of the overall impact, only focusing on the immediate effects, and ignoring the long-term interests, will be of no benefit to afforestation and beautification. In their view, the proper formulation should be "multiple trees and good trees." The “trees” here include trees and shrubs. “Good” refers to the selection of good seedlings and strong seedlings that are grown well, free of pests and diseases, and are planted according to scientific requirements. Changing the tree species to talk about science In recent years, there have been more and more calls for the replacement of tree species, and there has also been a tendency to blindly replace tree species. In the eyes of the professors, it is possible to carry out the necessary replacement of tree species due to afforestation and beautification, pest damage, and flying flocks. However, the purpose and scientific nature of this change should be very clear, and it must be carried out after careful scientific demonstration. As soon as spring arrives, the poplar's flocculation is annoying. As a result, the white poplar became a target of public opinion. Some people advocate using other poplars, or other tree species such as platanus. The professors told reporters that the evaluation of a tree species cannot "attack it, not counting the rest." The problem of fly flocks is not unique to Populus tomentosa, and other willow trees have. Some white poplars have been "subjected to generations." Even if it has such a defect, it should not be killed on one stick. The time of Populus tomentosa is very short, but the growth rate and the greening effect of Populus tomentosa have merits. In addition, tree species such as platanus have problems with fly flocks. The professor suggested that the selection of tree species should not only be based on superficial phenomena, but should pay special attention to those deep-seated problems. For example, the allergies caused by the pollen of some trees, the toxicity and carcinogenicity of some ornamental plants to humans, and even the negative effects on temperature, have not attracted enough attention. Change the species also consider pests and diseases. Some people have advocated replacing Euonymus fortunei with Euonymus japonicus. The view of the two professors is that the powdery mildew and anthrax of Euonymus japonicus are serious. The professors said that the tree species must be rich and colorful and not monotonous. Otherwise, not only the landscape effect is not good, but it will also cause pests and diseases. The Torch Tree adds color to the natural world, but it cannot become a "Tree of the Overlord." Some people use their psychology of disliking some tree species and oversell certain tree species. Some media also conducted hype, causing undue confusion. In this regard, the professors criticized. The increase in exotic tree species has increased the threat of biological disasters such as diseases and insect pests. Experts stressed that we must attach great importance to risk assessment so as to avoid "bringing wolves into the room" and cause endless troubles. Greening should fully listen to expert opinions Greening and beautifying is a scientifically strong cause. Should fully respect the opinions of experts. However, the two professors believe that we should not only listen to the opinions of individual individuals, nor can we listen to the opinions of experts in a single subject, and we must not listen to one-sided or extreme opinions. The two professors pointed out that the selection of tree species for afforestation and beautification is by no means a single expert or a few specialists. Because the academic face of individuals is always limited, various disciplines will discuss issues from their own perspectives, and they will inevitably have certain limitations or one-sidedness. and so. We must give full play to the collective wisdom of multidisciplinary experts such as breeding, seedling raising, afforestation, management, and environmental plant protection, and we must combine this wisdom with the rich practical experience of the people and the leaders’ intentions in a scientific and organic manner. The most effective way is to hold hearings, listen to a wide range of opinions, and meet with the society before implementation. The two professors suggested that.

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