文献类型：期刊文献

中文题名：北京门头沟主城区及其城郊森林大气污染物时空变化特征

英文题名：Temporal and spatial variation characteristics of atmospheric pollutants in main city area and its suburban forest of Mentougou,Beijing

作者：郭嘉[1] 辛学兵[1] 郭慧[1] 法蕾[1] 裴顺祥[1] 吴迪[1] 马淑敏[1]

机构：[1]中国林业科学研究院华北林业实验中心,北京102300

年份：2020

卷号：39

期号：2

起止页码：32-40

中文期刊名：生态科学

外文期刊名：ECOLOGICAL SCIENCE

收录：CSTPCD;;CSCD:【CSCD_E2019_2020】；

基金：中国林科院基本科研业务费专项资金(CAFYBB2014MA017);国家自然科学基金项目(31470705)。

语种：中文

中文关键词：城郊森林;大气污染物;时空变化特征

外文关键词：suburban forest;atmospheric pollutants;temporal and spatial variation characteristics

分类号：X51

摘要：由于前人对城市大气污染物时空变化特征研究结论缺乏统一性,以及城市森林及其周边大气污染物协同变化规律研究结果的不确定性,研究以建立在北京市门头沟的3套固定空气质量监测站为依托,以主要大气污染物SO2和氮氧化物为研究对象,分析典型居民区、林缘和林内主要大气污染物浓度的日、月、季及特定天气下的变化规律,拟揭示北京门头沟主城区及其城郊森林大气污染物时空变化特征。研究结果表明,秋季林内SO2浓度为夜间高于白天,其余大部分为白天高于夜间;林内氮氧化物的日变化特征为双峰型,居民区为单峰型;居民区、林缘空气中SO2的日变化规律表现为单峰型,林内SO2日变化秋季为凹面型,冬季无明显特征;林内、林缘、居民区空气中SO2浓度均为冬季高于秋季,林内、居民区空气中NO2为秋季高于冬季,NO、NOx冬季与秋季无显著差异;居民区、林内SO2在2月份达到峰值,林缘1月达到峰值,林内氮氧化物10-11月份达到峰值,居民区11-12月达到峰值;居民区氮氧化物显著高于林内,SO2为林内、居民区显著高于林缘。在典型大气污染过程中,秋季林内空气中氮氧化物浓度波动幅度较居民区小且具有明显的滞后特征,冬季林内空气中NO、NOx浓度波动幅度较居民区小且无明显滞后特征,秋、冬季节林内空气中SO2浓度波动幅度较林缘、居民区大且无明显滞后特征;不同观测点大气污染物浓度显著正相关。城郊森林可以对其周边城市的大气污染物起到缓冲、抵抗和吸收作用,但特定天气条件下,森林中的大气污染物会向城市中扩散。
The conclusions of previous studies on the temporal and spatial characteristics of urban atmospheric pollutants are not consistent and there is uncertainty in the results of the studies on the cooperative variation of atmospheric pollutants in urban forest and its surroundings.This study was based on three sets of fixed air quality monitoring stations established in Mentougou,Beijing,the major atmospheric pollutants sulfur dioxide and nitrogen oxides were studied,the daily,monthly,seasonal and under specific weather conditions variations of the concentration of major air pollutants in typical community,forest edge and forest interior,and the temporal and spatial variation characteristics of atmospheric pollutants in main city area and its suburban forest of Mentougou in Beijing were revealed.The results show that,the concentration of SO2 during the night in the forest is higher than that during the day and the rest are higher during the day than at night.The daily variation of nitrogen oxides in the forest is bimodal and the residential area is unimodal.The daily variations of SO2 in residential areas and forest margins show a single–peak pattern.The daily variation of SO2 in the forest is a concave type in autumn and no obvious characteristics in winter.SO2 concentrations in forests,forest margins,and residential areas are higher in winter than in autumn.NO2 in forests and residential areas are higher in autumn than in winter,and there are no significant differences in NO and NOx between winter and autumn.The residential area and forest SO2 reached the peak in February,and the forest edge reached the peak in January.The nitrogen oxides in the forest reached the peak in October-November,and the residential areas peaked in November–December.Nitrogen oxides are significantly higher in residential areas than in forests.In the autumn,however,the SO2 concentrations in the forest and residential areas are significantly higher than those in the forest margins.In the process of typical atmospheric pollution,the concentration of nitrogen oxides in the forest is smaller than that in residential areas and has significant lagging characteristics in autumn,but in winter,the concentrations of NO and NOx in forest air are smaller than those in residential areas and there is no obvious lagging feature.In the autumn and winter,the concentration of SO2 in forest air fluctuates more than forest margin and residential area,and there is no obvious lagging feature.There is significantly positive correlation between atmospheric pollutant concentrations at different observation points.Suburban forests can buffer,resist and absorb atmospheric pollutants in surrounding cities.However,under specific weather conditions,atmospheric pollutants in forests will spread to cities.