Variation characteristics of the air anion and air particulate matter in arid and semi-arid urban park green spaces during summer

doi:10.12302/j.issn.1000-2006.202104048

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (4): 212-220.doi: 10.12302/j.issn.1000-2006.202104048

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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()

College of Forestry, Inner Mongolia Agricultural University, Hohhot 010010, China

Received:2021-04-28 Revised:2021-12-14 Online:2022-07-30 Published:2022-08-01
Contact: BAO Hongguang E-mail:1641293549@qq.com;baohongguang2016@163.com

Abstract

Abstract:

【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 PM_2.5 and PM_1.0 concentrations. There was a significant negative correlation between the air anion concentration and the PM_1.0 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.

Key words: urban park green space, air anion, air particulate matter, meteorological factors, environmental quality, Hohhot City

CLC Number:

S731

HOU Xiujuan, YAN Xiaoyun, WANG Bo, LI Xinyuan, BAO Hongguang. Variation characteristics of the air anion and air particulate matter in arid and semi-arid urban park green spaces during summer[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2022, 46(4): 212-220.

Figures/Tables 8

Table 1

Basic information of vegetation of five structures at the observation point"

观测点 observation point	植被结构 vegetation structure	主要植物种类 main plant species	平均高/m average tree height	平均胸径/cm average DBH	乔木层树种组成比 proportion of tree species in tree layer	郁闭度 canopy density	叶面积指数 leaf area index
M1	乔木型	榆树(U. pumila)	7.0±0.65	6.2±1.34	16:1:3:1:1:1	0.90±0.03	3.02±0.35
		白皮松(Pinus bungeana)	3.5±0.31	12.5±0.76
		云杉(Picae asperata)	3.1±0.35	8.3±0.55
		国槐(S. japonica)	5.6±0.78	7.7±1.21
		白杜(E. maackii)	3.5±0.43	4.1±0.47
		紫叶李(Prunus cerasifera f. atropurpurea)	3.0±0.20	2.6±0.18
M2	乔灌型	新疆杨(Populus alba var. pyramidalis)	12.2±1.65	12.5±0.58	1:2:5	0.32±0.06	1.32±0.26
		国槐(S. japonica)	5.6±1.13	8.4±0.64
		紫叶李(Prunus cerasifera f. atropurpurea)	3.2±0.47	2.3±0.07
		小叶黄杨(B. sinica)	0.8±0.09	—
		榆叶梅(A. triloba)	0.8±0.14	—
M3	乔草型	油松(Pinus tabuliformis)	3.5±0.22	6.0±1.14	3:1:2:1:1:1:1	0.61±0.08	1.92±0.19
		新疆杨(Populus alba var. pyramidalis)	12.6±0.87	12.9±1.26
		国槐(S. japonica)	5.3±0.61	8.7±0.67
		栾树(Koelreuteria paniculata)	5.7±0.58	6.5±0.54
		白杜(E. maackii)	3.5±0.37	4.0±0.57
		白蜡(Fraxinus chinensis)	4.2±1.05	4.6±0.79
		五角枫(A. mono)	4.0±0.78	4.3±1.03
		草地早熟禾(Poa pratensis)	—	—
M4	灌草型	连翘(F. suspensa)	2.1±0.31	—	—	—	0.84±0.18
		丁香(S. oblata)	2.5±0.36	—
		草地早熟禾(P. pratensis)	—	—
M5	乔灌草型	油松(Pinus tabuliformis)	3.5±0.64	6.8±0.36	4:1:2:3:1	0.76±0.04	2.28±0.32
		新疆杨(Populus alba var. pyramidalis)	11.4±0.98	12.3±1.26
		旱柳(Salix matsudana)	8.6±0.62	6.4±0.77
		国槐(S. japonica)	5.5±0.41	8.7±1.13
		白蜡(F. chinensis)	4.3±0.56	4.2±0.45
		红瑞木(Cornus alba)	2.1±0.09	—
		珍珠梅(Sorbaria sorbifolia)	2.5±0.63	—
		丁香(S. oblata)	2.6±0.36	—
		草地早熟禾(Poa pratensis)	—	—
CK	对照	硬质铺装	—	—	—	—	—

Table 1

Table 2

Fig.1

Fig.2

Table 3

Fig.3

Fig.4

Table 4

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评价等级 evaluation grade	空气负离子ari anion		空气颗粒物24 h平均浓度/(μg·m^-3·h^-1) average concentration of air particulate
评价等级 evaluation grade	浓度/(ions·cm^-3) concentraion	生物学效应 biological effects	TSP	PM₁₀	PM_2.5
Ⅰ	>3 000	保健浓度	< 120	<50	<35
Ⅱ	≥2 000~3 000	保健浓度	120~130	50~150	35~75
Ⅲ	≥1 500~2 000	保健浓度	>300	>150	>75
Ⅳ	≥1 000~1 500	保健浓度
Ⅴ	≥400~1 000	允许浓度
Ⅵ	<400	临界浓度

因素factor	空气负离子air anion
因素factor	R	P
风速 wind speed	-0.644^*	0.018
温度 temperature	-0.655^*	0.015
相对湿度 relative humidity	0.568^*	0.043
露点温度dew-point temperature	-0.140	0.649
郁闭度canopy density	0.129	0.871
叶面积指数leaf area index	-0.075	0.905
TSP浓度TSP mass concertration	0.484	0.094
PM₁₀浓度 PM₁₀mass concertration	0.069	0.823
PM_2.5浓度 PM_2.5mass concertration	-0.378	0.203
PM_1.0浓度 PM_1.0mass concertration	-0.595^*	0.023

空气颗粒物 air particulate	风速 wind speed		温度 temperature		相对湿度 relative humidity		露点温度 dew-point temperature		郁闭度 canopy density		叶面积指数 leaf area index
空气颗粒物 air particulate	R	P	R	P	R	P	R	P	R	P	R	P
TSP	-0.528	0.064	-0.664^*	0.013	0.640^*	0.018	0.061	0.844	0.808	0.192	0.500	0.392
PM₁₀	-0.297	0.324	-0.606^*	0.028	0.643^*	0.018	0.362	0.224	0.932	0.068	0.608	0.276
PM_2.5	0.034	0.911	-0.326	0.277	0.414	0.160	0.591^*	0.033	0.885	0.115	0.219	0.723
PM_1.0	0.228	0.453	-0.069	0.822	0.165	0.590	0.570^*	0.042	0.338	0.662	-0.208	0.737

Variation characteristics of the air anion and air particulate matter in arid and semi-arid urban park green spaces during summer

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