Emissions of biogenic volatile organic compounds from adjacent boreal fen and bog as impacted by vegetation composition
(2023) In Science of the Total Environment 858.- Abstract
Peatland ecosystems emit biogenic volatile organic compounds (BVOC), which have a net cooling impact on the climate. However, the quality and quantity of BVOC emissions, and how they are regulated by vegetation and peatland type remain poorly understood. Here we measured BVOC emissions with dynamic enclosures from two major boreal peatland types, a minerotrophic fen and an ombrotrophic bog situated in Siikaneva, southern Finland and experimentally assessed the role of vegetation by removing vascular vegetation with or without the moss layer. Our measurements from four campaigns during growing seasons in 2017 and 2018 identified emissions of 59 compounds from nine different chemical groups. Isoprene accounted for 81 % of BVOC emissions.... (More)
Peatland ecosystems emit biogenic volatile organic compounds (BVOC), which have a net cooling impact on the climate. However, the quality and quantity of BVOC emissions, and how they are regulated by vegetation and peatland type remain poorly understood. Here we measured BVOC emissions with dynamic enclosures from two major boreal peatland types, a minerotrophic fen and an ombrotrophic bog situated in Siikaneva, southern Finland and experimentally assessed the role of vegetation by removing vascular vegetation with or without the moss layer. Our measurements from four campaigns during growing seasons in 2017 and 2018 identified emissions of 59 compounds from nine different chemical groups. Isoprene accounted for 81 % of BVOC emissions. Measurements also revealed uptake of dichloromethane. Total BVOC emissions and the emissions of isoprene, monoterpenoids, sesquiterpenes, homoterpenes, and green leaf volatiles were tightly connected to vascular plants. Isoprene and sesquiterpene emissions were associated with sedges, whereas monoterpenoids and homoterpenes were associated with shrubs. Additionally, isoprene and alkane emissions were higher in the fen than in the bog and they significantly contributed to the higher BVOC emissions from intact vegetation in the fen. During an extreme drought event in 2018, emissions of organic halides were absent. Our results indicate that climate change with an increase in shrub cover and increased frequency of extreme weather events may have a negative impact on total BVOC emissions that otherwise are predicted to increase in warmer temperatures. However, these changes also accompanied a change in BVOC emission quality. As different compounds differ in their capacity to form secondary organic aerosols, the ultimate climate impact of peatland BVOC emissions may be altered.
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- author
- Männistö, Elisa ; Ylänne, Henni LU ; Losoi, Mari ; Keinänen, Markku ; Yli-Pirilä, Pasi ; Korrensalo, Aino ; Bäck, Jaana ; Hellén, Heidi ; Virtanen, Annele and Tuittila, Eeva Stiina
- organization
- publishing date
- 2023
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Dwarf shrub, Moss, Peat, Peatland, Sedge, Sphagnum
- in
- Science of the Total Environment
- volume
- 858
- article number
- 159809
- pages
- 10 pages
- publisher
- Elsevier
- external identifiers
-
- pmid:36336039
- scopus:85141286204
- ISSN
- 0048-9697
- DOI
- 10.1016/j.scitotenv.2022.159809
- language
- English
- LU publication?
- yes
- additional info
- Funding Information: This work is supported by the Faculty of Science and Forestry, University of Eastern Finland , Finnish Cultural Foundation (grant no. 00170743 and 00180750 ), Academy of Finland (project codes: 287039 , 316151 , 330840 , and 330845 ), and Jane and Aatos Erkko Foundation (Carbon Sink+). Funding Information: We thank Hyytiälä Forest Research Station and its staff for research facilities, and especially Juho Aalto for help in building the measurement system. We also thank Nicola Kokkonen, Risto Ikonen and Jarmo Pennala for their help in the field. This work is supported by the Faculty of Science and Forestry, University of Eastern Finland, Finnish Cultural Foundation (grant no. 00170743 and 00180750), Academy of Finland (project codes: 287039, 316151, 330840, and 330845), and Jane and Aatos Erkko Foundation (Carbon Sink+). Publisher Copyright: © 2022 The Authors
- id
- 7c96da78-84df-4b3e-99ff-b6ae97af424f
- date added to LUP
- 2022-12-19 09:19:21
- date last changed
- 2024-06-28 00:58:27
@article{7c96da78-84df-4b3e-99ff-b6ae97af424f,
abstract = {{<p>Peatland ecosystems emit biogenic volatile organic compounds (BVOC), which have a net cooling impact on the climate. However, the quality and quantity of BVOC emissions, and how they are regulated by vegetation and peatland type remain poorly understood. Here we measured BVOC emissions with dynamic enclosures from two major boreal peatland types, a minerotrophic fen and an ombrotrophic bog situated in Siikaneva, southern Finland and experimentally assessed the role of vegetation by removing vascular vegetation with or without the moss layer. Our measurements from four campaigns during growing seasons in 2017 and 2018 identified emissions of 59 compounds from nine different chemical groups. Isoprene accounted for 81 % of BVOC emissions. Measurements also revealed uptake of dichloromethane. Total BVOC emissions and the emissions of isoprene, monoterpenoids, sesquiterpenes, homoterpenes, and green leaf volatiles were tightly connected to vascular plants. Isoprene and sesquiterpene emissions were associated with sedges, whereas monoterpenoids and homoterpenes were associated with shrubs. Additionally, isoprene and alkane emissions were higher in the fen than in the bog and they significantly contributed to the higher BVOC emissions from intact vegetation in the fen. During an extreme drought event in 2018, emissions of organic halides were absent. Our results indicate that climate change with an increase in shrub cover and increased frequency of extreme weather events may have a negative impact on total BVOC emissions that otherwise are predicted to increase in warmer temperatures. However, these changes also accompanied a change in BVOC emission quality. As different compounds differ in their capacity to form secondary organic aerosols, the ultimate climate impact of peatland BVOC emissions may be altered.</p>}},
author = {{Männistö, Elisa and Ylänne, Henni and Losoi, Mari and Keinänen, Markku and Yli-Pirilä, Pasi and Korrensalo, Aino and Bäck, Jaana and Hellén, Heidi and Virtanen, Annele and Tuittila, Eeva Stiina}},
issn = {{0048-9697}},
keywords = {{Dwarf shrub; Moss; Peat; Peatland; Sedge; Sphagnum}},
language = {{eng}},
publisher = {{Elsevier}},
series = {{Science of the Total Environment}},
title = {{Emissions of biogenic volatile organic compounds from adjacent boreal fen and bog as impacted by vegetation composition}},
url = {{http://dx.doi.org/10.1016/j.scitotenv.2022.159809}},
doi = {{10.1016/j.scitotenv.2022.159809}},
volume = {{858}},
year = {{2023}},
}