Green roofs save the Beijing air

Beijing's leadership announced a plan to improve the air in the city by planting on rooftops 100,000 m2 of green plants.

The plan must be fully implemented by the end of this year, as has been proven by experts that the best way to clean the air of harmful respiratory particles of 2.5 microns (PM2.5) and smaller are the natural plantings and water. So will reduce the level of CO2 in the air in the Chinese capital and improve the health of citizens.

Green areas will be placed directly on the roofs of houses, which will be pre-reserved a waterproof membrane. A similar design will be used for vertical modular landscape on the walls of buildings. At the moment, for a project in the city there are 140 million workers are no roofs and walls that after planting herbs will not only become part of the design, but also a relief for asthma and allergy sufferers.

With the cost of planting guide is going to cope with the townspeople. If everyone in Beijing plant at least 1 m2 of green, it will be 20 million m2 of stands, which equals ten parks of the Summer Palace.

Besides the obvious ekokrysh bonus, there is also a positive effect due to the decrease in temperature in a busy city like Beijing. Absorption of high-rise buildings in the summer heat and heat the air in the streets of the capital may be reduced by 84% due to natural green barrier. If the hour of the day on the roof temperature is normal at around +40 ° C, the green is on weekdays ten degrees less. In general, the developers of the project will draw on the experience of Canada's urban greening.

Under the current five-year plan (2011-15 years) than greening roofs also planned to plant 13,000 hectares of forest along the Sixth Ring Road. This volume of forest can absorb 1.5 million tonnes of CO2 per year, stuffing oxygen will then reach 1.09 million tons. In just five bodies to be restored 67,000 hectares of forests.

This is to ensure that the city's air fell as much important for a person of negative oxygen ions. For example, in the summer of 2011 in Beijing ion concentration was only 600 units per cm3, while in suburban Miyun two hours it had reached 70,000. In the mountainous northern areas the figure is 110,000 units.

In China, where the gas content increases with extraordinary speed due to the number of machines (217 million units in the country, 5 million in Beijing) and developing industry, at peak levels of PM 2.5 is increased to 6 times compared with other circadian periods. Greening roofs can reduce the devastating effects of such avtonashestviya.

A pioneer in the design of green roofs are in 193, became hotel "Great Wall", located at the third ring road of Beijing. But then in the capital was less than 200 thousand cars, and green roof rather have a decorative function. Then followed the hotel "Beijing-Asia" in the second Ring Road. In 2004, the roof over the office space converted into a park.

For the landing hotels mainly used plant sedum (Sedum lineare), pleasant to look at, unpretentious and able to accumulate water. The hotel owners have resorted to professional advice for gardeners design gardens on rooftops at high altitude.

Of course, such bold and seemingly complicated for practical realization of the idea caused some criticism. Especially goes vertical landscape design, which many consider too expendable, and waterproof roof — something out of science fiction. However, this design is the right approach will only strengthen the high-rise building and increase its profitability. In addition, together with gardening methods should reconsider use of water and other resources for the system to work effectively.


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