Abstract:

The aim of this study is to provide a theoretical basis for choosing suitable pattern for urban afforestation by analyzing the change regular of air negative charge ions concentration (ANCIC) in different types of green space. The ANCIC in different types of green space in Fuzhou City were studied in this paper. The results showed that the ANCIC was in the order of the public green space> educational green space> residential green space> commercial green space> industrial green space, ion polarity ratio increased gradually in the order too, while the air ion assessment index decreased. The ANCIC and the air quality were in the order of tree-shrub-grass> tree-grass> shrub-grass> grass> the bare. The diurnal change pattern of ANCIC was more moderate, almost linear decline in the public green space, educational green space and residential green space, but which was of single valley in commercial green, dual valley in industrial green space. The diurnal change pattern of ANCIC was the same in different types of green space structure, which was monotone decreasing.