文献类型：期刊文献

英文题名：Stand structure and environment jointly determine negative air ion concentrations in forests: Evidence from concurrent on-site monitoring in four typical subtropical forests during the growing season

作者：Li, Aibo[1,2] Li, Qiaoling[3] Yang, Yuhao[1,2] Hu, Yutao[1,2] Xiao, Shuhao[1,2] Li, Zhengcai[1,2] Zhou, Benzhi[1,2]

第一作者：Li, Aibo

通信作者：Zhou, BZ[1]

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, Hangzhou 311400, Zhejiang, Peoples R China;[2]Natl Forestry & Grassland Adm, Qianjiangyuan Forest Ecosyst Res Stn, Hangzhou 311400, Zhejiang, Peoples R China;[3]China Natl Bamboo Res Ctr, Hangzhou 310012, Zhejiang, Peoples R China

年份：2024

卷号：220

外文期刊名：ENVIRONMENTAL AND EXPERIMENTAL BOTANY

收录：;Scopus(收录号：2-s2.0-85184598646);WOS:【SCI-EXPANDED(收录号:WOS:001180556600001)】；

基金：This work was supported by the Sci-Tech Cooperation Program be-tween Zhejiang Province and Chinese Academy of Forestry (grant number 2020SY06) , the Key Research and Development Program of Zhejiang Province (grant number 2021C02005) , and the Fundamental Research Funds for the Central Non-profit Research Institution of the Chinese Academy of Forestry (grant number CAFYBB2018ZA002) .r Research Funds for the Central Non-profit Research Institution of the Chinese Academy of Forestry (grant number CAFYBB2018ZA002) .

语种：英文

外文关键词：Negative air ions; Subtropical forests; Spatial and temporal dynamics; Stand structure; Environmental factors; Concurrent on-site monitoring

摘要：Negative air ions (NAIs) have been extensively studied by scientists and administrators due to their crucial role in assessing the benefits of forest health to humans and improving air quality. This paper presents the results of a study conducted in four typical subtropical forests, where 24-hour on-site monitoring of NAIs, air temperature, relative humidity, wind speed, direct radiation, and particulate matter was conducted during the growing season. The vegetation characteristics of these forests were also investigated. Correlation and random forest analyses were employed to jointly evidence the effects of stand structure and environmental factors on NAI concentrations using mean data for the monitoring period. Additionally, regression analyses were employed to discuss the response of NAIs to continuous changes in meteorological factors using screened nighttime data. Our analysis revealed that NAI diurnal dynamics followed a unimodal pattern, with peaks observed in the afternoon (13:30-16:30) and troughs in the early morning (4:00-7:00). Significant variations in NAI concentrations were observed among the forest types, with mixed broadleaved forest showing the highest concentrations, followed by phoebe forest, Moso bamboo plantation, and Chinese fir plantation. The differences in NAI concentrations among forest types were primarily influenced by plant density at monitor heights, plant diversity, leaf area index, and tree height diversity. Overall, NAI concentrations were positively influenced by temperature and relative humidity and negatively influenced by particulate matter, while the influence of wind speed varied with forest type. Furthermore, our findings indicate that changes in particulate matter had a greater contribution to NAI concentrations compared to meteorological factors. By quantifying the spatial and temporal characteristics of NAIs in typical subtropical forests and their relationships with influencing factors from the perspectives of both stand structure and environment, our study provides new insights into scheduling human forest therapy activities and managing therapeutic forests.