| Along with our country city scale is expanding, the ecological environment ceaseless deteriorating, improve the city environment is imminent. Air quality is the main problem of city environment for human survival, and negative air ions as an important index for evaluation of city air quality, gradually get everyone’s attention and favor. Because the air anion has health care, air purification, intelligence development and other functions, it has been widely used in medicine, agriculture, industry and city environment evaluation etc..This paper selected the typical urban forest park of Harbin, Heilongjiang Forest Botanical Garden as the study area, to monitor the negative air ion concentration in the botanical garden, and used the method of statistical analysis to compare and analyze the monitoring data, to study the negative air ions time distribution regularity and the relationship between negative air ion and influencing factors. According to the results of the interpretation of remote sensing images and field measurement data obtained from the study area, we could apply spatial interpolation method to get the negative air ion concentration distribution map of the study area, and we could study the negative air ion distribution and spatial pattern in the region through the GIS spatial analysis technology. The main conclusions are as follows:(1)Negative air ion concentration and temperature was significantly negatively correlated, negative air ion concentration and humidity was significantly positively related, negative air ion concentration and light intensity correlation is not obvious.(2)The air quality evaluation index CI value was: summer> spring> autumn, and CI values were greater than one.(3) Botanical Gardens park features different plant species air anion concentration change were: Shrubs structure> Joe grass structure>Shrub and grass structures> Shrubbery> Grassland> Space.(4) Through the monitoring distance, it showed the influence of negative air ions decreases with distance, negative correlation.The conclusion of the study showed that, in the Heilongjiang Forest Botanical Garden, its forest coverage rate was higher and air cleanliness was good, because lush botanical garden summer vegetation, abundant rainfall, air humidity was bigger, so the negative air ion concentration was significantly higher than the other seasons. The annual air quality evaluation index CI value was greater than one, indicating Heilongjiang province forest botanical garden of the air quality was good, and the best in the summer. The negative air ion concentration of botanical garden was significantly higher than that of the nearby residential area, also had a significant impact on the residential area, botanical garden showed that the air quality was conducive to human health. Through the monitoring distance, we could clearly find the influence of negative air ions with distance increases, and there was a negative correlation, indicating that the negative ion air had effect on the surrounding environment. So to improve the environmental quality in the city not only rely on the city of Forest Park, also want to pay attention to living in city greening. |
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