北京西山典型游憩林空气颗粒物不同季节的日变化
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国家“十一五”攻关课题资助项目(2006BAD03A06)


Diurnal variations of airborne particulate matters in different seasons in typical recreation forests in West Mountain of Beijing
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    摘要:

    以百望山森林公园为例,对北京西山3种典型游憩林一年四季空气颗粒物浓度进行了昼夜观测,结果发现:(1)北京西山3种典型游憩林4种粒径空气颗粒物日变化整体上在4个季度均近似呈“双峰双谷”型,两个高峰时段分别出现在5:00~9:00和19:00之后到凌晨3:00,低谷出现时间是15:00左右和5:00左右,不同季节之间峰、谷出现时间稍有差异。(2)3种游憩林相比较,侧柏林空气颗粒物夜间高峰出现迟,高峰值大,且高峰期持续时间长,故夜间低谷出现时间也延迟。所以郁闭度较大的侧柏林夜间空气颗粒物浓度高于其他两种林型,且在夏、秋季表现得越来越明显。(3)同一游憩林不同粒径空气颗粒物相比,细粒径颗粒物白天高峰和夜间低谷出现时间提前,而白天低谷和夜间高峰却有所滞后。

    Abstract:

    Concentrations of the airborne particulate matters (PM) in 3 kinds of typical recreation forests in West Mountain of Beijing were monitored day and night in 4 seasons. The observation was made in the Baiwang Mountain. The results showed that: (1) Diurnal variation curves of PM concentrations with 4 kinds of particulate diameters in 3 kinds of typical recreation forests in West Mountain of Beijing all showed nearly “two peaks and two vales” in 4 seasons, and two peaks presented at 5:00-9:00 and 19:00-3:00, and two vales presented at around 15:00 and 5:00 respectively. Peaks and vales time had a minor difference in different seasons. (2) Comparing with other two forests, PM peak time at night in Platycladus orientalis forest occurred later, PM concentration was higher at peaks time, and the duration of the peak was longer. Accordingly, the vale time at night presented also later. Therefore, PM concentration at night in Platycladus orientalis forest with bigger crown density was higher than Cotinus coggygria forest and the mixed forest, especially in summer and autumn. (3) Within a same forest, peaks in day and vales at night of finer particles presented all earlier than that of coarser particles, while vales in day and peaks at night presented later.

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郭二果,王成*,郄光发,房城,孙志伟,周志海.北京西山典型游憩林空气颗粒物不同季节的日变化.生态学报,2009,29(6):3253~3263

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