Abstract:

In the process of urban development, the impact of fine particulate matter (PM_2.5) on urban environmental air quality, residents' health and sustainable development is increasing. The paper is based on literature sample data from WOS database and CNKI database from 1971 to 2020, including literature sample data on research topics related to fine particulate matter in urban environment. Based on the analysis of regional distribution characteristics, co-citation analysis of literatures, detection of emerging words, co-occurrence analysis of keywords and multi-dimensional scale analysis in CiteSpace software, this paper systematically sorted out the frontiers, knowledge bases, hot spots and development trends in the research field of fine particulate matter in urban environment. The following conclusions are drawn: (1) In terms of research trend, as the proportion of Chinese scholars' papers published in international journals has been increasing year by year, the research contents at home and abroad are slightly different but generally convergent;(2) In terms of research properties, domestic studies focus on describing the causes and characteristics of fine particulate matter, while foreign studies mostly use dynamics and deposition principles to analyze the movement rules of fine particulate matter in the field. (3) In terms of research objects, there are more source analysis cases in China, while the studies on the spatial pattern of traffic emissions in foreign countries are at the forefront. And (4) in terms of research frontier, domestic researches mainly focus on the refinement of principal component analysis and the optimization of indoor air quality, while foreign researches are more inclined to study the impact of fine particles on human body from the perspective of sustainable development, human health and improvement of human living environment. Finally, it is suggested that we should strengthen interdisciplinary cooperation and expand the systematic study of fine particulate matter from the perspective of human settlement environment. It is necessary to pay comprehensive attention to its horizontal movement and vertical diffusion in different cities and functional areas. At the same time, we need to effectively optimize the spatial configuration of green infrastructure and accurately control environmental pollution from the source to improve urban air quality and maintain urban ecological balance.

Key words: urban environment, fine particulate matter, visual analysis, mapping knowledge domains, CiteSpace, CNKI

摘要：

细颗粒物（PM_2.5）在城市发展进程中,对城市环境空气质量和居民健康的影响程度日益上升。文章数据来源于1971—2020年WOS和CNKI数据库中城市环境中细颗粒物相关研究主题的文献样本数据,利用CiteSpace软件,通过区域分布特征分析、关键词共现分析、突现词探测、文献共被引分析和多维尺度分析等,系统梳理了城市环境中细颗粒物研究领域的前沿、知识基础、热点现状与发展趋势,得出以下结论：（1）在研究趋势方面,中国学者近年来在国际上发表论文的占比逐年递增,国内外研究内容稍有差异,但总体趋同;（2）在研究性质方面,国内研究侧重于描述细颗粒物的产生原因及表现特征方面,国外则多运用动力学和沉积原理对场域中的细颗粒物运动规律做出解析;（3）在研究对象方面,国内的源解析案例较多,而国外则推进交通排放空间格局的研究;（4）在研究前沿方面,国内研究主要关注主成分分析的细化和室内空气质量的优化,国外研究则更倾向于从可持续发展、人类健康及改善人居环境角度研究细颗粒对人体的影响。最后,文章认为应加强多学科交叉与合作,拓展人居环境视角下细颗粒物的系统性研究,综合关注其在不同城市和功能区的水平运动和垂直扩散规律,有效优化绿色基础设施的空间配置,准确地从源头控制环境污染,从而改善城市的空气质量,维护城市生态平衡。

关键词: 城市环境, 细颗粒物, 可视化分析, 科学知识图谱, CiteSpace, CNKI