1、 The lung function of the city. With the concentration of urban population, the development of industrial production and transportation, more and more waste water, waste gas and combustion smoke are discharged, which not only affects the environmental quality, but also directly damages people's health, resulting in headaches, tinnitus, vomiting and high blood pressure. If there are a large number of garden plants, they can constantly adjust the balance of carbon dioxide and oxygen in the atmosphere, improve the environment and promote a virtuous cycle of urban ecology. According to the experiment, 25 square meters of lawn or 10 square meters of trees can absorb all the carbon dioxide exhaled by one person in one day. Therefore, urban landscaping is called "the lung of the city".
2、 Kill germs. Plants can reduce bacterial pollution and are natural "sterilizers". As the urban green space is covered by plants such as flowers, trees, etc., the dust in the air is reduced accordingly, and the pathogens adhering to it are also reduced. In addition, many garden plants can also secrete a bactericidal fungicide. According to the measurement, the amount of bacteria in the air in the places with green trees and flowers is significantly reduced by nearly 20 times than that in the open land. It can be seen that greening plays a positive role in urban environmental health, so landscaping is called the "purifier" of the city.
3、 Ecological and cultural functions. The ultimate and highest goal of China's landscaping is to pursue the natural spiritual realm, so as to achieve the realm of "although it is made by people, it is like opening from heaven". It is deeply imbued with the connotation of Chinese culture. It is an artistic treasure created in the five thousand years of Chinese cultural history, a reflection of a nation's inherent spiritual character, and a magnificent cause that we need to inherit and develop today. The activities of culture, recreation, sports and popular science education in gardens can enrich people's lives and broaden their horizons, and learn more extensive knowledge from them, so as to enrich people's spiritual life. In the process of building a socialist harmonious society, urban landscaping is the most economic, effective and positive element of urban ecology. It is a long-term major undertaking with extremely extraordinary significance.