Yan Guoxin, Yu Zibo, Wu Yanan, Liu Jiakai, Wang Yu, Zhai Jiexiu, Cong Ling, Zhang Zhenming
School of Ecology and Nature Conservation, Beijing Forestry University, Beijing, China.
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, China.
PeerJ. 2020 May 7;8:e8988. doi: 10.7717/peerj.8988. eCollection 2020.
To increase our knowledge of PM concentrations near the surface in a forest park in Beijing, an observational study measured the concentration and composition of PM in Beijing Olympic Forest Park from 2014 to 2015. This study analyzed the meteorological factors and removal efficiency at 1.5 m above the ground (human breathing height) over the day in the forest. The results showed that the average concentrations of PM near the surface peaked at 07:00-09:30 and reached their lowest at 12:00-15:00. Besides, the results showed that the annual concentration of PM in the forest was highest during winter, followed by spring and fall, and was lowest during summer. The main chemical components of PM near the surface in the forest were SO and NO , which accounted for 68.72% of all water-soluble ions that we observed. The concentration of PM in the forest had a significant positive correlation with relative humidity and a significant negative correlation with temperature. The removal efficiency near the surface showed no significant variation through the day or year. In the forest, the highest removal efficiency occurred between 07:00 and 09:30 in summer, while the lowest occurred between 09:30 and 12:00 in winter.
为了增加我们对北京某森林公园近地表颗粒物（PM）浓度的了解，一项观测研究在2014年至2015年期间对北京奥林匹克森林公园的PM浓度和成分进行了测量。该研究分析了森林中一天内地面以上1.5米（人体呼吸高度）处的气象因素和去除效率。结果表明，近地表PM的平均浓度在07:00 - 09:30达到峰值，在12:00 - 15:00达到最低值。此外，结果显示森林中PM的年浓度在冬季最高，其次是春季和秋季，夏季最低。森林近地表PM的主要化学成分是SO 和NO ，它们占我们观测到的所有水溶性离子的68.72%。森林中PM的浓度与相对湿度呈显著正相关，与温度呈显著负相关。近地表的去除效率在白天或全年均无显著变化。在森林中，夏季07:00至09:30去除效率最高，而冬季09:30至12:00去除效率最低。
