DOI: 10.1111/gcb.14935
论文题名: Origin of volatile organic compound emissions from subarctic tundra under global warming
作者: Ghirardo A. ; Lindstein F. ; Koch K. ; Buegger F. ; Schloter M. ; Albert A. ; Michelsen A. ; Winkler J.B. ; Schnitzler J.-P. ; Rinnan R.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2020
卷: 26, 期: 3 语种: 英语
英文关键词: 13CO2
; Arctic
; climate change
; de novo biosynthesis
; global warming
; net ecosystem exchange
; subarctic heath
; terpene
; tundra
; volatile organic compound
Scopus关键词: arctic environment
; carbon dioxide
; global warming
; subarctic region
; terpene
; tundra
; vegetation dynamics
; volatile organic compound
; Arctic
; Betula
; Salix
英文摘要: Warming occurs in the Arctic twice as fast as the global average, which in turn leads to a large enhancement in terpenoid emissions from vegetation. Volatile terpenoids are the main class of biogenic volatile organic compounds (VOCs) that play crucial roles in atmospheric chemistry and climate. However, the biochemical mechanisms behind the temperature-dependent increase in VOC emissions from subarctic ecosystems are largely unexplored. Using 13CO2-labeling, we studied the origin of VOCs and the carbon (C) allocation under global warming in the soil–plant–atmosphere system of contrasting subarctic heath tundra vegetation communities characterized by dwarf shrubs of the genera Salix or Betula. The projected temperature rise of the subarctic summer by 5°C was realistically simulated in sophisticated climate chambers. VOC emissions strongly depended on the plant species composition of the heath tundra. Warming caused increased VOC emissions and significant changes in the pattern of volatiles toward more reactive hydrocarbons. The 13C was incorporated to varying degrees in different monoterpene and sesquiterpene isomers. We found that de novo monoterpene biosynthesis contributed to 40%–44% (Salix) and 60%–68% (Betula) of total monoterpene emissions under the current climate, and that warming increased the contribution to 50%–58% (Salix) and 87%–95% (Betula). Analyses of above- and belowground 12/13C showed shifts of C allocation in the plant–soil systems and negative effects of warming on C sequestration by lowering net ecosystem exchange of CO2 and increasing C loss as VOCs. This comprehensive analysis provides the scientific basis for mechanistically understanding the processes controlling terpenoid emissions, required for modeling VOC emissions from terrestrial ecosystems and predicting the future chemistry of the arctic atmosphere. By changing the chemical composition and loads of VOCs into the atmosphere, the current data indicate that global warming in the Arctic may have implications for regional and global climate and for the delicate tundra ecosystems. © 2020 The Authors. Global Change Biology published by John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158778
Appears in Collections: 气候变化与战略
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作者单位: Research Unit Environmental Simulation (EUS), Institute of Biochemical Plant Pathology, Helmholtz Zentrum München, Neuherberg, Germany; Terrestrial Ecology Section, Department of Biology, University of Copenhagen, Copenhagen, Denmark; Institute of Biochemical Plant Pathology (BIOP), Helmholtz Zentrum München, Neuherberg, Germany; Research Unit for Comparative Microbiome Analysis (COMI), Helmholtz Zentrum München, Neuherberg, Germany; Center for Permafrost, Department of Geoscience and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark
Recommended Citation:
Ghirardo A.,Lindstein F.,Koch K.,et al. Origin of volatile organic compound emissions from subarctic tundra under global warming[J]. Global Change Biology,2020-01-01,26(3)