北京奥林匹克森林公园绿地空气负离子密度季节和年度变化特征

Seasonal and Annual Characteristics of Concentration of Negative Air Ions in Beijing Olympic Forest Park

研究了北京奥林匹克森林公园区域2005—2010年的负离子密度,结果显示:2009年5月份至2010年5月份,公园的负离子密度具有明显的年度变化特征,2009年夏季空气质量最好,其次是秋季,而2010年春季空气质量最差;测量时间内负离子具有显著的季节密度特征,夏季最高(2 500个.cm-3以上),春季最低(低于阈值,1 000个.cm-3),而秋季(约2 100个.cm-3)仅次于夏季而高于冬季(1 070个.cm-3);公园绿地建成前后,基于负离子密度的空气质量具有显著的改善。从而表明,公园绿地植被对于提高绿地所在局部区域以负离子密度为主要参数的空气质量具有显著作用。

A study was performed to determine the concentration of Negative air ions （NAI） in Beijing Olympic Forest Park （BOFP） from May 2005 to May 2010. A significant annual variation in NAI concentration was observed in BOFP. The air quality was the best in the summer of 2009, followed by the autumn, and the worst was in the spring of 2010. NAI concentration also had a significant seasonal variation during the observation period. The concentration of NAI was the highest in summer （ over 2 500 ind./cm3 ）, followed by fall （ approximately 2 100 ind./cm3 ）, winter （ 1 070 ind./cm3 ）, and spring （ 1 000 ind./cm3 , below the threshold value）. The air quality based on NAI concentration was greatly improved after the construction of green space in BOFP. Vegetation in park green space has a significant effect on the improvement of air quality in terms of NAI concentration.