Study On Temporal-spatial Pattern Of Air-anion And Influential Factors In Urban Green Space In Jiamusi

Air-anion is praised as air vitamin. Its concentration has been an important index in evaluating cleanness of the urban air. The paper studied the temporal-spatial pattern of airanion concentration and the influential factors to air-anion in urban green space in Jiamusi. According to more than one year observation, conclusions are the following: (â… ) It was showed that the air-an.ion concentration and ability of air changed obviously during a day. The concentration was higher in early morning and midnight, and the ability of air was better. In mid-day and late afternoon, the air-anion concentration was lower. (â…¡)It was showed that the air-anion concentration changed obviously during the year. In December, air-anion concentration and ability of air was the lowest. It was higher in July. From August to December, the air-anion concentration and ability of air gradually decreased, then got better and better month by month after January. So far as seasons are concerned, the air-anion concentration and air cleanness was highest in summer, then in spring and autumn. And it was lowest in winter. (â…¢)The air-anion concentration and air cleanness changed a little in the same structure of urban green space during a day. It was showed that the air-anion concentration changed obviously in different structure of urban green space. It was highest in multilayer structure, followed by double arbor and lawn structure, double shrub and lawn structure and single lawn structure. (â…£) In different urban function-area, the air-anion concentration changed obviously. It was higher in urban green space. The air-anion concentration and cleanness was lowest in traffic road. (â…¤)There were relations between air-anion concentration and environmental factors. There was obvious negative correlation between air-anion concentration and temperature. The air-anion concentration has obvious positive correlation with humidity and atmospheric. While to the wind velocity, there was no correlation exist. (â…¥)Between cloudy day and sunny day, the different is not so significant. The air-anion concentration and air cleanness in sunny day is only a little higher than in cloudy day. (â…¦)Besides Picea koraiensis and Pinus sylvestris var. mongolica, it was showed that the air-anion concentration and ability of air cleanness changed obviously. For different forest, the order is Picea koraiensis, Pinus sylvestris var. mongolica, Betula platyphylla and Armeniaca vulgaris. And under conifer forest, the air-anion concentration and ability of air was higher than broadleaf forest.