2015年北京采暖季城市森林内外SO 2 浓度的时空变化特征

Q2 Environmental Science

环境科学研究 Pub Date : 2017-11-25 DOI:10.13198/j.issn.1001-6929.2017.03.08

蒋燕, 熊好琴, 鲁绍伟, 陈波, 李少宁

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Abstract

为探讨采暖季城市森林内外ρ(SO2)动态变化及差异性，基于西山国家森林公园林内空气质量监测站数据，结合北京市环境保护监测中心植物园监测站的实时数据，分析2015年采暖季城市森林内外ρ(SO2)变化和影响因素.结果表明：林内外ρ(SO2)日变化基本呈双峰双谷型，在09：00-11：00和20：00-22：00左右达到高峰；采样期间ρ(SO2)月变化呈不显著'V'型，最高值出现在1月，林内外分别为(25.8±9.2)和(31.7±23.4)μg/m3，最低值出现在11月，林内外分别为(19.0±5.2)和(13.0±11.2)μg/m3.林内ρ(SO2)在1-3月低于林外，11-12月高于林外，林内ρ(SO2)变化较林外平缓；气象条件对采暖季城市森林ρ(SO2)变化有重要影响：降水对ρ(SO2)消减效应明显，大风有驱散SO2的作用，同时受风向影响；ρ(SO2)和温度关系不显著(P=0.05，R < 0.40)，但和空气相对湿度线性关系显著(α=0.05，Sig=0.00)，林内受气象因素影响低于林外.研究显示，城市森林对气态污染物具有一定的缓冲、抵抗和吸收能力，因此应重视发展城市森林生态系统，充分发挥其生态效益，以提高城市大气环境质量.

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The spatiotemporal variation characteristics of SO2 concentration inside and outside urban forests during the heating season in Beijing in 2015

To explore the heating season inside and outside urban forests ρ Based on the data from the air quality monitoring station in Xishan National Forest Park and the real-time data from the botanical garden monitoring station of the Beijing Environmental Protection Monitoring Center, the dynamic changes and differences of (SO2) were analyzed for the 2015 heating season in and out of urban forests ρ Changes and influencing factors of (SO2). The results indicate that: inside and outside the forest ρ The daily variation of (SO2) shows a double peak and double valley pattern, reaching its peak around 09:00 to 11:00 and 20:00 to 22:00; Sampling period ρ The monthly variation of (SO2) shows an insignificant 'V' pattern, with the highest value appearing in January. The values inside and outside the forest are (25.8 ± 9.2) and (31.7 ± 23.4), respectively μ G/m3, with the lowest value appearing in November, and the values inside and outside the forest are (19.0 ± 5.2) and (13.0 ± 11.2), respectively μ G/m3. In the forest ρ (SO2) is lower than outside the forest from January to March, higher than outside the forest from November to December, and within the forest ρ The change of SO2 is relatively gentle outside the forest; Meteorological conditions affecting urban forests during the heating season ρ Changes in (SO2) have a significant impact: precipitation has a significant impact on ρ (SO2) has a significant reduction effect, with strong winds having the effect of dispersing SO2 and being influenced by wind direction; ρ The relationship between (SO2) and temperature is not significant (P=0.05, R<0.40), but there is a significant linear relationship with relative humidity of the air（ α= 0.05, Sig=0.00), the impact of meteorological factors inside the forest is lower than that outside the forest. Research has shown that urban forests have a certain buffering, resistance, and absorption capacity for gaseous pollutants. Therefore, attention should be paid to the development of urban forest ecosystems, and their ecological benefits should be fully utilized to improve the quality of urban atmospheric environment

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