Background: Biogenic volatile organic compounds (BVOCs) play an essential role in tropospheric atmospheric chemical reactions. There are few studies conducted on BVOCs emissions of dominant forest species in the Jing-Jin-Ji area. Based on the field survey, forest resources data and the measured standard emission factors, this paper applies the Guenther model developed in 1993 (G93) to estimate the emissions of BVOCs from several dominant forest species (Platycladus orientalis, Quercus variabilis, Betula platyphylla, Populus tomentosa, Pinus tabuliformis, Robinia pseudoacacia, Ulmus pumila, Salix babylonica and Larix gmelinii) in the Jing-Jin-Ji area in 2017. Then the spatiotemporal emission characteristics and atmospheric chemical reactivity of these species were extensively evaluated.
Results: Results showed that the total annual BVOCs emissions were estimated to be 70.8 Gg C·a-1, consisting of 40.5% (28.7 Gg C·a-1) isoprene, 36.0% (25.5 Gg C·a-1) monoterpenes and 23.4% (16.6 Gg C·a-1) other VOCs. The emissions from Platycladus orientalis, Quercus variabilis, Populus tomentosa and Pinus tabulaeformis contributed 56.1%, 41.2%, 36.0% and 31.1%, respectively. In summer and winter, BVOCs emissions from the Jing-Jin-Ji area accounted for 61.9% and 1.8% of the annual total. Up to 28.8% of emissions were detected from Chengde followed by Beijing with 24.9%, mainly distributed in the Taihang Mountains and the Yanshan Mountains. Additionally, the Robinia pseudoacacia, Populus tomentosa, Quercus variabilis, and Pinus tabulaeformis contributed mainly to BVOCs reaction activity.
Conclusions: Emissions peaked in summer (June, July, and August) and bottomed out in winter (December, January, and February). Chengde contributed the most, followed by Beijing. Platycladus orientalis, Quercus variabilis, Populus tomentosa, Pinus tabulaeformis and Robinia pseudoacacia represent the primary contributors to BVOCs emissions and atmospheric reactivity, hence the planting of these species should be reduced.

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Posted 27 Jan, 2021
On 27 Feb, 2021
Received 26 Feb, 2021
Received 14 Feb, 2021
On 01 Feb, 2021
Invitations sent on 31 Jan, 2021
On 31 Jan, 2021
On 19 Jan, 2021
On 19 Jan, 2021
On 19 Jan, 2021
On 23 Dec, 2020
Received 23 Dec, 2020
On 23 Dec, 2020
Received 16 Nov, 2020
On 03 Nov, 2020
Invitations sent on 02 Nov, 2020
On 23 Oct, 2020
On 22 Oct, 2020
On 22 Oct, 2020
On 22 Oct, 2020
Posted 27 Jan, 2021
On 27 Feb, 2021
Received 26 Feb, 2021
Received 14 Feb, 2021
On 01 Feb, 2021
Invitations sent on 31 Jan, 2021
On 31 Jan, 2021
On 19 Jan, 2021
On 19 Jan, 2021
On 19 Jan, 2021
On 23 Dec, 2020
Received 23 Dec, 2020
On 23 Dec, 2020
Received 16 Nov, 2020
On 03 Nov, 2020
Invitations sent on 02 Nov, 2020
On 23 Oct, 2020
On 22 Oct, 2020
On 22 Oct, 2020
On 22 Oct, 2020
Background: Biogenic volatile organic compounds (BVOCs) play an essential role in tropospheric atmospheric chemical reactions. There are few studies conducted on BVOCs emissions of dominant forest species in the Jing-Jin-Ji area. Based on the field survey, forest resources data and the measured standard emission factors, this paper applies the Guenther model developed in 1993 (G93) to estimate the emissions of BVOCs from several dominant forest species (Platycladus orientalis, Quercus variabilis, Betula platyphylla, Populus tomentosa, Pinus tabuliformis, Robinia pseudoacacia, Ulmus pumila, Salix babylonica and Larix gmelinii) in the Jing-Jin-Ji area in 2017. Then the spatiotemporal emission characteristics and atmospheric chemical reactivity of these species were extensively evaluated.
Results: Results showed that the total annual BVOCs emissions were estimated to be 70.8 Gg C·a-1, consisting of 40.5% (28.7 Gg C·a-1) isoprene, 36.0% (25.5 Gg C·a-1) monoterpenes and 23.4% (16.6 Gg C·a-1) other VOCs. The emissions from Platycladus orientalis, Quercus variabilis, Populus tomentosa and Pinus tabulaeformis contributed 56.1%, 41.2%, 36.0% and 31.1%, respectively. In summer and winter, BVOCs emissions from the Jing-Jin-Ji area accounted for 61.9% and 1.8% of the annual total. Up to 28.8% of emissions were detected from Chengde followed by Beijing with 24.9%, mainly distributed in the Taihang Mountains and the Yanshan Mountains. Additionally, the Robinia pseudoacacia, Populus tomentosa, Quercus variabilis, and Pinus tabulaeformis contributed mainly to BVOCs reaction activity.
Conclusions: Emissions peaked in summer (June, July, and August) and bottomed out in winter (December, January, and February). Chengde contributed the most, followed by Beijing. Platycladus orientalis, Quercus variabilis, Populus tomentosa, Pinus tabulaeformis and Robinia pseudoacacia represent the primary contributors to BVOCs emissions and atmospheric reactivity, hence the planting of these species should be reduced.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7
The full text of this article is available to read as a PDF.
This is a list of supplementary files associated with this preprint. Click to download.
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