The text of the Green Wall lesson plan is very popular in cities all over the world. Why do you want to introduce so many green walls?

Starting with the comparison of fences at home and abroad, this paper introduces different forms and tastes of green fences in many countries, introduces the progress made in greening in China in recent years, and scientifically expounds the role of building green fences in beautifying and purifying cities and protecting ecological environment.

Throughout the global cities, the biggest difference between China and foreign countries is the fence. According to incomplete statistics, the total length of the walls of public units (excluding houses) in China exceeds 5 million kilometers, which can circle the earth 125 times, and the area exceeds 1 100 square kilometers. The dead angles of the two walls cannot be utilized, reaching 3350 square kilometers.

Go abroad and visit cities all over the world, including some developing countries. You can't see such a "spectacular" fence array anywhere!

The so-called "fences" in some foreign cities are either elegant railings, hollowed-out barbed wire or vibrant "green fences": buildings are looming in the "fences", which neither damages the overall beauty of the urban environment nor hinders the public's vision space.

The so-called "green fence" is to "build a wall" with plants instead of bricks, stones or reinforced concrete. This vibrant green wall not only occupies a small area, saves materials and funds, but also has remarkable effects in greening and beautifying the city, reducing noise and dust, purifying the air and adjusting the temperature, which is quite popular among people.

The most distinctive urban green wall building in the world is the "plant wall" in Brazil. In Brazil, the green walls people see are made of hollow bricks, covered with gum and fertilizer, and then planted with grass seeds. As long as the climate is suitable, grass will grow from them and make the walls green. This kind of plant wall not only has aesthetic value, but also can reduce noise and air pollution.

The buildings in major western cities are often green, and the grass is swaying in the breeze. At first, a special "bio-brick" was used for exterior walls. If the wall is properly sprayed with water at ordinary times, it can be green all year round, heat and sound insulation, absorb carbon dioxide and purify the air in the community. In Brasilia, the capital of Brazil, the per capita green space is nearly 100 square meter, ranking first in the world. Brazilian law stipulates that construction projects without greening design may not be constructed; After the construction project with greening design is completed, the exposed soil on the ground will not be accepted. So, when the house is finished, the lawn, flower bed and hedge are also finished, finished. Every 10 apartment building forms a "square street", that is, a residential district. Surrounded by a large green plant belt (including evergreen shrub wall, small garden and lawn), it plays a role in filtering air and preventing noise. Brasilia, the new capital just established at 1960, has almost no historical value. However, it was designated as "human cultural heritage" by the United Nations in 1987. In addition to its ingenious design and novel urban style, square of the three powers has become a model of a modern new city because of its excellent greening and harmonious coexistence between people and the environment. 1990 Curitiba, the capital of Paraná, Brazil, was named "Ecological Capital" by the United Nations. Although the population of this city has soared from 500,000 after the war to 6.5438+0.5 million, the per capita green area has increased from 0.5 square meters to 54 square meters. The citizens put the energy of building the fence into greening and created a thick "green wall".

When Australia established Canberra as its capital in 1927, it was clearly stipulated that non-plant walls should not be built in public and private buildings. Today, Canberra has no second wall except the Prime Minister's office, which is equipped with sentry boxes and guards. In order to cover the office space, government agencies and organizations have enclosed green barriers with towering acacia and eucalyptus. Embassies all over the world have introduced their own unique flowers and trees and carefully woven green fences, giving passers-by a feeling of visiting botanical gardens in various countries. A two-story building with a single house is provided with free seedlings by the government, and a low wall is composed of roses, cacti, coral trees and pear trees. Like the capital, cities such as Sydney and Melbourne have added green walls to the greening team. The outer edge of Melbourne Park is connected with the street without any fence. Most of the buildings in Sydney are blocked by camphor trees and French phoenix trees. Evergreen trees and deciduous trees are well matched, which is warm in winter and cool in summer. The villa area is surrounded by short trees and shrubs, but it does not block the buildings.

Climbing to the highest point in Singapore-the 73rd floor 226-meter-high Stanford Hotel, I saw lush trees and green grass, and I couldn't find a walled building at all. In this pocket country of 64 1 square kilometer, 3 million people live in gardens of all sizes. Singapore law stipulates that houses with gardens can be exempted from property tax, and there is no need to build walls for passers-by to enjoy; Residential buildings must be more than 0/5m away from the road/kloc-,with green space accounting for 65% and construction area accounting for 35%. To this end, Singaporeans only built hedges, not fences. From 197 1, they planted trees and paved lawns, and even overpasses, waiting sheds and telephone poles climbed vines, which surrounded the city with green.

In Japan, building materials researchers put the prepared wall grid into water, let bryophytes reproduce and attach on it, and then salvage it after growing for a period of time, making it a novel and unique ecological prefabricated part. Then put it in the place where the city needs greening.

Lagos, the capital of Nigeria in Africa, decided to move its capital inland Abuja on 1979 because of its full population. At the beginning of moving the capital, the government issued an order to ban fences and determine the new capital as an open city. 1985, the municipal government ordered the demolition of masonry walls built by more than ten units without authorization, making today's Abuja masonry walls extinct, with trees and trees, a wide field of vision and colorful trees and rattan walls everywhere.

In the town of Sanitas, Botswana, South Africa, the "ecological wall" is even more amazing. Here, the outer wall is lined with hollow bricks, filled with soil, planted with flowers and vegetables, and fertilized with water and fertilizer, which keeps green all the year round and effectively uses the space.

Tunisia, the capital of Tunisia in North Africa, chose Aralia elata as the fence. Aralia elata is a kind of cactus, stout, strong vitality, life span of hundreds of years, swollen stems, dense branches and leaves, rich fruits and high ornamental value. Cut off the top of the tree to inhibit its upward growth, and the bottom will become thicker and fatter, and finally grow into a "solid wall" with almost no gaps, which is strong and beautiful. Most public houses and private courtyards in the city are surrounded by this kind of green wall, which blocks the sandstorm and becomes the dividing line of residents' rights.

In recent years, green walls and green doors have become popular in Washington, USA. The material of the wall door is a plastic brick filled with soil. The holes of the brick are outward, and flowers and vegetables are planted inside. After the seedlings are unearthed, they stretch out of the hole, bend upward to absorb sunlight, bloom in various colors, and bear corn cob, sunflower, pepper and so on. Loofah and gourd are hung in different lengths. This is really a wall of vegetables and flowers. More interestingly, all the service units that build green doors and green walls have many visitors, and their business is particularly prosperous.

In recent years, China's Shanghai, Tianjin, Guangzhou and other places have also begun to build green belts, and a large number of plant walls have been built around factories, schools and institutions. Looking around, the green eyes are widely praised by the public. The walls of the famous Longbai Hotel in western Shanghai and Tongji University in Shanghai are also plant walls with good ecological effects, which are lush and interesting. Dalian has made outstanding achievements in greening. The garden wall of the park and the wall of some street-facing units and houses were demolished and replaced by low iron railings and green lawns, which afforested the city, broadened people's horizons and made people feel comfortable, relaxed and happy.

It is feasible and effective.

China has been building fences for thousands of years. Although building a wall has the function of safety and demarcation, it has little effect today with advanced technology. "If you want to attack it, if you want to steal it, you don't care about a wall." Breaking through the walled area can not only save land, but also save the construction cost of 1% ~ 10%, increase the green area, broaden people's horizons, improve the landscape, beautify and purify the urban environment. Replacing brick walls with green walls is the need of the times, opening up, beautifying our homes, protecting the ecological environment and improving living conditions.