摘要
以北京西山森林公园为林内观测点,北京海淀植物园为林外对照点,研究城市森林PM_(2.5)质量浓度变化特征,并对其影响因素进行分析。结果表明,林内外PM_(2.5)质量浓度日变化呈"双峰双谷"型,8:00和21:00左右是一天中的两个峰值,15:00和4:00左右是一天中的两个谷值,PM_(2.5)质量浓度林内(104.02μg·m^(-3))>林外(82.52μg·m^(-3))。一年中PM_(2.5)质量浓度在冬季最高,春季次之,夏季最低,PM_(2.5)质量浓度年变化林内为冬季(115.46μg·m^(-3))>春季(112.39μg·m^(-3))>秋季(106.37μg·m^(-3))>夏季(81.87μg·m^(-3)),林外为冬季(97.35μg·m^(-3))>春季(94.07μg·m-3)>秋季(93.17μg·m^(-3))>夏季(61.86μg·m^(-3))。气温、降雨均与PM_(2.5)浓度呈负相关。晴天时,温度高、空气对流旺盛,PM_(2.5)浓度较低;降水对PM_(2.5)有很好的消减作用;风有驱散PM_(2.5)的作用。在高温高湿天气下,PM_(2.5)浓度高于其他天气情况。该研究可以丰富森林净化大气的理论,为环保部门相关政策的制定提供依据。
We selected two observation points in vegetation areas, and Beijing Xishan forest park forest is forest interior observation point, Beijing haidian botanical garden as forest outside control point, to study characteristics of urban forest’s PM2.5mass concentration and to analyze its influence factors. The results showed that: The daily variation of PM2.5 mass concentration is "double peak valley" in forest interior and outside. Around 8:00 and 21:00 are two peak values of the day, around 15:00 and 4:00 are valley values of the day. The PM2.5concentration in inside forest (104.02μg·m-3) is higher than it in outside forest (82.515μg·m-3). In a year, PM2.5mass concentration in summer is lowest, which is second in Autumn and is third in spring. PM2.5mass concentration in winter is highest. Annual variation of PM2.5mass concentration is winter (115.46μg·m-3) > spring (112.39μg·m-3) > autumn (106.37μg·m-3) > summer (81.87μg·m-3) in forest interior, and winter (97.35μg·m-3) > spring (94.07μg·m-3) > autumn (93.17μg·m-3) > summer (61.86μg·m-3) in forest outside. Different meteorological factors, temperature, precipitation and wind are negative correction with PM2.5concentration. Sunny days in a row, air convection is strong, PM2.5 concentration is relatively low; precipitation has cutting effect on PM2.5,the wind can disperse the PM2.5; and PM2.5concentration is higher than other weather conditions in high temperature and high humidity. Richen theory about forest’s purifying atmosphere. And provide the evidence for related policy that environmental protection departments make.
出处
《生态环境学报》
CSCD
北大核心
2016年第3期447-457,共11页
Ecology and Environmental Sciences
基金
北京市农林科学院青年科研基金项目(QNJJ201530)
关键词
林内(北京西山公园)
林外(北京海淀植物园)
PM2.5质量浓度特征
影响因素
inside forest(Beijing xishan park)
outside forest(Beijing haidian botanical garden)
characteristics of PM2.5 mass concentration
influential factors
