北京森林BVOCs排放现状及动态变化特征分析

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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.

Key words： timber volume isoprene monoterpene ozone secondary organic aerosol volatile organic compounds

Received: 21 February 2022

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X511

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	ZHANG Qiang
	LI Ling-jun
	ZHAO Wen-hui
	LIU Bao-xian
	LU Hai-feng
	QIN Li-huan
	CHEN Yun-ru
	LI Qi

Cite this article:

ZHANG Qiang,LI Ling-jun,ZHAO Wen-hui等. The current status and characteristics of variations in forest BVOCs emissions in Beijing[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(9): 3991-4000.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I9/3991

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