The current status and characteristics of variations in forest BVOCs emissions in Beijing
ZHANG Qiang1,2, LI Ling-jun1,2, ZHAO Wen-hui1,2, LIU Bao-xian1,2,3, LU Hai-feng1,2, QIN Li-huan1,2, CHEN Yun-ru1,2, LI Qi1,2
1. Beijing Municipal Ecological and Environment Monitoring Center, Beijing 100048, China; 2. Beijing Key Laboratory of Airborne Particulate Matter Monitoring Technology, Beijing 100048, China; 3. School of Environment, Tsinghua University, Beijing 100084, China
Abstract：Accurate estimation of biogenic volatile organic compounds (BVOCs) emissions is necessary for developing effective air pollution control measures. To understand the current status and characteristics of variations in forest BVOCs emissions in Beijing, historical BVOCs emission inventories for the period from 2000 to 2020 were developed based on the volume data of forest resources survey, hourly meteorological data and light-temperature model. The results show that the forest BVOCs emissions in 2020 were 39.57×109g C, of which isoprene, monoterpene and other VOCs accounted for 72.19%, 17.48% and 10.32%, respectively. Broadleaf trees emitted the largest amount of isoprene and total BVOC emissions, while conifers made the largest monoterpene emission. Results show that Beijing’s annual forest BVOCs emissions had increased from 20.30×109g C in 2000 to 39.57×109g Cin 2020, with an annual average increase rate of 4.75%. Isoprene, monoterpene and other VOCs accounted for 64.54%, 22.28% and 13.16% of the total increment, respectively. In the past 20 years, the proportion of isoprene decreased, while the proportion of monoterpene and OVOCs increased. The contribution to the BVOCs emissions tended to decrease for poplar while to increase significantly for quercus and other broadleaf trees, indicating that the new afforestation in Beijing has led to a higher species diversity. From 2000 to 2020, the ozone formation potential of BVOCs had increased from 181.76×109 to 331.07×109g C, of which isoprene was the main contributor, accounting for 92.70%. The secondary organic aerosol formation potential of BVOCs had increased from 1.11×109 to 2.65×109g C, and the contribution of monoterpene and isoprene was 75.40% and 24.60%, respectively. Poplar exhibits the highest ozone formation potential, and Pinus tabulaetormis shows the highest secondary organic aerosol formation potential. The forest BVOCs emissions made relatively higher contribution to ozone pollution in summer. Therefore, tree species optimization should be considered to mitigate BVOCs emissions.
张蔷, 李令军, 赵文慧, 刘保献, 鹿海峰, 秦丽欢, 陈韵如, 李琪. 北京森林BVOCs排放现状及动态变化特征分析[J]. 中国环境科学, 2022, 42(9): 3991-4000.
ZHANG Qiang, LI Ling-jun, ZHAO Wen-hui, LIU Bao-xian, LU Hai-feng, QIN Li-huan, CHEN Yun-ru, LI Qi. The current status and characteristics of variations in forest BVOCs emissions in Beijing. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(9): 3991-4000.
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