Concentration of Negative Oxygen Ion and Its Influencing Factors in Coniferous and Broad-Leaved Mixed Forest in the Suburbs of Nanchang City

doi:10.13466/j.cnki.lyzygl.2022.05.011

Abstract

Abstract:

Concentration of air negative oxygen ions(NOI) plays an important role in evaluating forest health effects and promoting human physical and mental health.In order to explore the level of negative oxygen ions in the air of urban forest environment,this study took coniferous and broad-leaved mixed forest in the suburbs of Nanchang city as the research object,and conducted long-term on-site monitoring of NOI concentration,air PM_2.5 content,temperature and relative humidity within 24 hours from January 2021 to December 2021.The negative oxygen ion concentration and its influencing factors in coniferous and broad-leaved mixed forest were analyzed to explore the temporal dynamic mode of NOI.The results showed as follows:1)The average annual concentration of NOI in the forest was 1786 ind/cm³,which reached the level ⅱ fresh standard and was beneficial to human body;2)The diurnal variation of NOI concentration in the forest showed a "double-peak and single valley" trend,that was,the concentration of NOI was the highest at 05:00,the second highest at 17:00,and the lowest at 12:00,and the concentration in the period without sunshine was higher than that in the period with sunshine;3)Due to the seasonal changes,the NOI concentration was characterized as autumn>winter>summer>spring;4)Correlation analysis results showed that NOI concentration was negatively correlated with air PM_2.5 content and positively correlated with relative humidity,but temperature had no obvious effect.These results can provide references for assessing the ecological benefits of urban forestry and for citizens to arrange outdoor sports and forest conservation activities.

Key words: negative oxygen ion, change of concentration, influencing factor, coniferous and broad-leaved mixed forest, Nanchang City

CLC Number:

TANG Haofan, WU Qiaohua, WANG Liyan, ZHOU Chen, WANG Hua, DI Lan, LUO Kunshui. Concentration of Negative Oxygen Ion and Its Influencing Factors in Coniferous and Broad-Leaved Mixed Forest in the Suburbs of Nanchang City[J]. FOREST RESOURCES WANAGEMENT, 2022, (5): 84-90.

Figures/Tables 11

Fig.1

Tab.1

Fig.2

Fig.3

Tab.2

Fig.4

Fig.5

Tab.3

The fitting equation and significance test of NOI concentration with each factors and correlation analysis

自变量	方程	R²	P	Pearson
PM_2.5	$y = - 23.445 x + 2286.22$	0.053	0.278	-0.291^**
相对湿度	$y = 10.220 x + 1053.499$	0.301	0.003	0.231^**
温度	$y = - ? 37.407 x + 2525.854$	0.408	0.001	0.005

Tab.3

Fig.6

Fig.7

Fig.8

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等级	负氧离子浓度/(个/cm³)	大气状况
Ⅰ级	n≥3000	非常清新
Ⅱ级	1200≤n<3000	清新
Ⅲ级	500≤n<1200	较清新
Ⅳ级	300≤n<500	一般
Ⅴ级	100≤n<300	较不清新
Ⅵ级	n<100	不清新

时段	负氧离子浓度/(个/cm³)
00:00—04:00	1876
04:00—08:00	1926
08:00—10:00	1772
10:00—12:00	1704
12:00—15:00	1711
15:00—17:00	1749
17:00—20:00	1720
20:00—00:00	1700