摘要
空气负离子(negative air ion,NAI)浓度是衡量空气清洁度的重要指标之一,不同时间尺度下NAI浓度的分析结果可能存在差异。从多时间尺度(时、天、月、季、年)视角出发,通过Mann-Kendall检验探究福州国家森林公园2017-2020年NAI浓度的变化趋势,采用小波分析探究NAI浓度变化周期性,应用灰色关联厘清多时间尺度下NAI浓度与温湿度的关系变化。结果表明,1)NAI浓度在春夏季变化不显著,秋冬季显著下降。2)NAI时平均浓度峰值和谷值分别在4:00和11:00,冬春季低且平稳,夏秋季较高且波动强。3)月尺度NAI浓度存在6、11、17、52个月的主周期,日尺度具有6、12、18、40 d的主周期,时尺度存在12、19、51 h的主周期,分钟尺度存在25、40 min主周期。4)NAI浓度与温度灰色相关性低于浓度与湿度灰色相关性,二者在时和日尺度上较低,在月和季尺度上较高。研究结果从多时间尺度揭示NAI浓度变动特征及其与温湿度关系,并给出高效康养出行时间建议,即在5、10月的6、12、18、24、30日的8:00、16:00进行游园较为适宜。
Negative air ion(NAI)concentration is one of the important indicators to measure air cleanliness.The analysis results of NAI concentration may be different when using different time scales.In perspective of multiple time scales(hour,day,month,season,and year),Mann-kendall(M-K)test was used to explore the trend of NAI concentration from 2017 to 2020 in Fuzhou National Forest Park.The metric of wavelet analysis was employed to explore the periodic variation characteristics of NAI concentration.Besides,grey correlation model was utilized for analyzing the correlations and their variations between NAI concentration and temperature and humidity by different time scales.The results showed that 1)the NAI concentration did not change significantly in spring and summer,but decreased significantly in autumn and winter.2)The peak and valley values of the mean NAI concentration occurred at 4 and 11 o'clock,respectively.The variation of mean NAI concentration was low and stable in winter and spring,but high and fluctuated in summer and autumn.3)There were main periods of 6,11,17 and 52 months at the scale of month of NAI concentration,6,12,18,and 40 days at the scale of day,12,19 and 51 hours at the scale of hour,and 25,40 minutes at the scale of minute.4)The grey correlation between NAI concentration and temperature was lower than that between NAI concentration and humidity;both of them were lower at scales of minute and day,and higher at the scales of month and season.This research reveals the variation characteristics of NAI concentration and its relationship with temperature and humidity from multiple time scales,and proposes the travel time for efficient forest health care,that is,at 8:00 and 16:00 on 6 th,12 th,18 th,24 th and 30 th of May and October,which are more suitable for a park tour.
作者
朱映辰
谭芳林
阙翔
洪宇
潘爱芳
刘金福
ZHU Ying-chen;TAN Fang-lin;QUE Xiang;HONG Yu;PAN Ai-fang;LIU Jin-fu(College of Computer and Information Science,Fujian Agriculture and Forestry University,Fuzhou 350002,Fujian,China;Fujian Academy of Forestry Science,Fuzhou 350012,Fujian,China;College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350002,Fujian,China;Key Laboratory for Ecology and Resource Statistics of Fujian Province,Fuzhou 350002,Fujian,China;Fuzhou Botanical Garden,Fuzhou 350012,Fujian,China;Technology Innovation Center for Monitoring and Restoration Engineering of Ecological Fragile Zone in Southeast China,Ministry of Natural Resources,Fuzhou 350001,Fujian,China)
出处
《西北林学院学报》
CSCD
北大核心
2023年第6期211-218,227,共9页
Journal of Northwest Forestry University
基金
福建省省级科技创新重点项目(2021G02007)
中央引导地方科技发展资金项目(2020L3006,2021L3033)
福建省科技创新项目资金资助(东南生态修复〔2021〕4号KY-090000-04-2021-013)
福建省林业科技项目(2022FKJ02,2022FKJ26)
福建农林大学科技创新专项基金(KCX21F33A,CXZX2020149C)
数字福建环境监测物联网实验室开放课题(202008)
福建农林大学乡村振兴服务团队支持计划(11899170152)。
关键词
多时间尺度
负离子
小波分析
变化特征
multiple time scale
negative air ion
wavelet analysis
change characteristics
