长江中游地区不同林地覆盖率下PM_(2.5)的综合影响因素及比较研究  

Comparative Study on Comprehensive Influencing Factors of PM_(2.5) Under Different Forest Coverage in Middle Reaches of Yangtze River Basin

作　　者：苗欣然 曾晨 程轶皎 吕天宇 MIAO Xin-ran;ZENG Chen;CHENG Yi-jiao;LV Tian-yu(Instiute of Geogruphie Scienes and Natural Reources Researeh,Chinese Academy of Sciences,Beijing 100101,China;Colle of Resouroes and Environment,University of Chinese Aeademy of Seiences,Beijing 100049,China;College of Publie Adninistration,Huachong Agricultural Universily,Wahan 430070,China;Schol of Publie Poliey and Administnotion,Xi'an Jioltong University,Xi'an 710049,China)

机构地区：[1]中国科学院地理科学与资源研究所,北京100101 [2]中国科学院大学资源与环境学院,北京100049 [3]华中农业大学公共管理学院,湖北武汉430070 [4]西安交通大学公共政策与管理学院,陕西西安710049

出　　处：《长江流域资源与环境》2022年第6期1302-1311,共10页Resources and Environment in the Yangtze Basin

基　　金：国家自然科学基金面上项目(41771563)。

摘　　要：空气质量与人类健康和社会经济可持续发展密切相关,探究不同用地形态下大气污染物浓度变化的影响因素具有重要理论和实证意义。以长江中游地区为例,采用空间回归模型,以林地覆盖率作为划分研究区域的基准因子,以林地景观格局作为挖掘PM_(2.5)变化驱动的关键因子,综合考虑区域社会经济和自然条件状况,从PM_(2.5)的来源、扩散和清除3个方面选取影响因子,探索不同林地覆盖率下PM_(2.5)的综合影响因素并对其进行比较分析。研究结果表明:(1)不同林地覆盖率下的影响因素对于PM_(2.5)在影响模式上类似,但在作用方式和作用强度上有所不同;(2)PM_(2.5)的空间异质性明显,随着林地覆盖率的提高,PM_(2.5)浓度明显减低;(3)降低林地斑块分离度有利于降低PM_(2.5)浓度;(4)DEM是影响PM_(2.5)的主要因素,其对PM_(2.5)的削弱作用随着林地覆盖率的增加而增加。基于以上研究结果,建议根据不同等级林地覆盖区的特点,加强长江中游地区大气污染的精细化治理,结合PM_(2.5)的空间外溢性特征,强化地区之间的联防联控。Air quality is closely related to human health and sustainable social and economic development.It is of important theoretical and empirical significance to explore the factors affecting the changes in air pollutant concentration in the context of different land use patterns.This study took the middle reaches of the Yangtze River as an example.We adopted a spatial regression model,in which we used forestland coverage as the benchmark factor,and took the forestland landscape pattern as the key factors to explore the driving mechanism of PM_(2.5).Integrated with the regional socio-economic and natural conditions,we selected influencing factors from the three aspects of PM_(2.5)namely source,diffusion and removal.The comprehensive influencing factors of PM_(2.5)with different forest coverage were explored,compared and analyzed.The results show that:(1)The influencing factors with different forest coverage affect PM_(2.5)in similar patterns,yet with different path and magnitude;(2)The spatial heterogeneity of PM_(2.5)is obvious.With the increase of forest coverage,the PM_(2.5)concentration is greatly reduced;(3)Decreasing the of the fragmentation degree of forest patches is beneficial to reduce the PM_(2.5)concentration;(4)DEM is the main factor affecting PM_(2.5).It is shown that with the increase of forest coverage,the weakening effect on PM_(2.5)increase.Based on the results,it is recommended to strengthen the refined control of air pollution in the middle reaches of the Yangtze River basin according to the characteristics of different forest coverage areas,and combine the spatial spillover characteristics of PM_(2.5)to strengthen joint prevention and control among the regions.

关 键 词：林地覆盖率 PM_(2.5) 影响因素 长江中游地区 

分 类 号：X513[环境科学与工程—环境工程]