摘要
【目的】通过分析空气负离子(NAI)和大气污染物浓度变化特征以及二者的相关关系,并研究森林释放NAI的影响因素,以验证城市森林中空气负离子的大气净化功能。【方法】基于北京西山国家森林公园长期监测的NAI和大气污染物浓度数据,采用Origin软件绘制其日变化特征图和SPSS软件分析二者的相关性,根据《环境空气质量标准》(GB3095—2012)分析不同大气污染物水平下与NAI的相关性。【结果】城市森林NAI浓度与PM_(2.5)、NO_(2)呈显著性负相关,与O_(3)呈显著性负相关,其中NAI浓度变化主要受NO_(2)的影响。无论PM_(2.5)浓度水平的高低,NAI都能够敏锐地对PM_(2.5)浓度的变化做出反馈。NAI对NO_(2)有一定承载能力,NO_(2)浓度低于40μg/m^(3)时,NAI浓度范围在2000~2800个/cm^(3)。而O_(3)浓度小于50μg/m^(3)时,NAI浓度与O_(3)呈现正相关,O_(3)浓度高于50μg/m^(3)时,NAI浓度与O_(3)呈现负相关。【结论】监测点的大气污染物浓度普遍偏低,说明城市森林的空气污染程度较低,且森林中释放的NAI能够敏锐地对污染物浓度值升高做出反馈,进一步验证了城市森林对城市化影响具有一定抵抗力。
【Objective】The variation characteristics of air negative ions(NAI)and atmospheric pollutant concentration as well as their correlation were analyzed to study their influencing factors,and verify the atmospheric purification function of air negative ions in urban forests.【Method】On the basis of NAI and air pollutants concentration data monitored for a long time by Beijing Xishan National Forest Park,Origin software was used to draw the daily variation characteristic chart and SPSS software respectively to analyze the correlation between them.Then,the correlation between NAI and different air pollutant levels was analyzed according to Environmental Air Quality Standard(GB3095—2012).【Result】Urban forest NAI concentration was negatively correlated with PM_(2.5),NO_(2)and O_(3),NAI concentration was mainly affected by NO_(2).Regardless of the level of PM_(2.5) concentration,NAI could make feedback to the change of PM_(2.5) concentration sensitively.NAI had certain bearing capacity for NO_(2),when concentration of NO_(2)was lower than 40μg/m^(3),NAI concentration ranges between 2000 and 2800 ion/cm^(3).When O_(3)concentration was lower than 50μg/m^(3),NAI concentration was positively correlated with O_(3);When O_(3)concentration was greater than 50μg/m^(3),NAI concentration was negatively correlated with O_(3).【Conclusion】The concentration of atmospheric pollutants at monitoring points is generally low,indicating that the degree of air pollution in urban forests is low,and the NAI released in forests can make feedback to the increased concentration of pollutants sensitively,further verifying that urban forests have certain resistance to the impact of urbanization.
作者
李少宁
李嫒
赵旭
鲁绍伟
赵娜
徐晓天
徐兰
LI Shao-ning;LI Ai;ZHAO Xu;LU Shao-wei;ZHAO Na;XU Xiao-tian;XU Lan(Forestry and PomologyInstitute,Beijing Academy of Agriculture and Forestry Sciences,Beijing 100093,China;Shenyang Agricultural University,Liaoning Shenyang 110866,China)
出处
《西南农业学报》
CSCD
北大核心
2021年第10期2269-2273,共5页
Southwest China Journal of Agricultural Sciences
基金
北京市农林科学院科技创新能力建设资助项目(KJCX20200801,KJCX 20200602,KJCX20190301)
国家自然科学基金“基于模拟试验的北京园林绿化树种对PM2.5吸滞与分配机制研究”(32071834)、“北京山区典型植被幼苗非结构性碳水化合物存储机制研究”(31800363)。
