Influences Of Green Space On Air Quality And Water Balance Of Green Space Under Different Target Air Quality In Changsha City

Abstract:It is approved that the urban green space plays an important role in improving air quality in the city, but the construction and development of the urban green space is restricted not only by the urban land area but also by the irrigation water. In order to study the quantitative relation between green space and air quality, the air quality, the urban green space and the utilization of rain water were quantitatively analyzed as a system based on the problem that improving air quality need increase the area of urban green space, so that will lead increase of irrigation volume. The main works and main results are as follows.1. Through comparative study on Yuelu Mountain, Martyr Park and Wuyi Square, it was concluded that the air cleanliness of the central green space had good correlation with the area of green space and the structure of vegetation. Due to larger area of green space, more trees, air negative ions concentration and air cleanliness in Yuelu Mountain was obviously higher than that of the Martyr park and Wuyi square. Further analysis showed that the air quality difference among the three sample regions was very significant. At the same time, air negative ions concentration and air cleanliness in the three sample regions presented obvious seasonal change, the air negative ions concentration is relatively high in July and August but relatively low in January and February; and the air quality is relatively good in September and October but relatively poor in January and February.2. With the condition that the green cover percentages are close, the make full use of natural rainfall and guarantee the growth of vegetation in green space, thereby improving the air quality.