
Variation characteristics of the air anion and air particulate matter in arid and semi-arid urban park green spaces during summer
HOU Xiujuan, YAN Xiaoyun, WANG Bo, LI Xinyuan, BAO Hongguang
JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (4) : 212-220.
Variation characteristics of the air anion and air particulate matter in arid and semi-arid urban park green spaces during summer
【Objective】 To monitor the air anion concentration and air particulate matter concentration of different vegetation structures in arid and semi-arid urban park green spaces, the influencing factors and their interaction are analyzed, to provide a theoretical basis for urban residents to choose the recreation time and park construction. 【Method】 In July and August 2020, the air anion concentration and air particulate matter concentration were monitored simultaneously in five vegetation structures and their control points at Chilechuan Park in Hohhot, and the variations and influencing factors of the air anion and air particulate matter were analyzed. 【Result】 The air anion concentration of different vegetation structures had a “V” shaped variation. The highest value for the air particle matter concentration was recorded in the morning, and the lowest value was recorded in the afternoon. The average concentration of air anions in different vegetation structures was higher than that of the control point, and the air anion concentration in the multi-layer vegetation structure was higher than the single-layer vegetation structure. The reduction and agglomeration effect coexisted in the regulation of different vegetation structures. Meteorological factors were the main factors affecting the concentration of the air anions and air particulate matter. Wind speed was significantly negatively correlated with the concentration of air anions, with temperature being significantly negatively correlated with the concentration of air anions, TSP and PM10. Relative humidity was significantly positively correlated with the concentration of air anions, TSP and PM10. The dew point temperature was significantly positively correlated with PM2.5 and PM1.0 concentrations. There was a significant negative correlation between the air anion concentration and the PM1.0 concentration. 【Conclusion】 The multi-layer vegetation structure had a significant effect on increasing the concentration of air anions than the single-layer vegetation structure, and the vegetation density played a positive role in reducing the concentration of the air particulate matter. In line with the results, it was suggested that the best time for residents around the city to carry out leisure activities was 9:00-10:00 and 14:00-17:00.
urban park green space / air anion / air particulate matter / meteorological factors / environmental quality / Hohhot City
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