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Monoterpene emissions in response to long-term night-time warming, elevated CO2 and extended summer drought in a temperate heath ecosystem

Tiiva, Päivi ; Tang, Jing LU ; Michelsen, Anders and Rinnan, Riikka LU (2017) In Science of the Total Environment 580. p.1056-1067
Abstract

Monoterpenes emitted from plants have an important role in atmospheric chemistry through changing atmospheric oxidative capacity, forming new particles and secondary organic aerosols. The emission rates and patterns can be affected by changing climate. In this study, emission responses to six years of climatic manipulations (elevated CO2, extended summer drought and night-time warming) were investigated in a temperate semi-natural heath ecosystem. Samples for monoterpene analysis were collected in seven campaigns during an entire growing season (April–November, 2011). The results showed that the temperate heath ecosystem was a considerable source of monoterpenes to the atmosphere, with the emission averaged over the 8 month... (More)

Monoterpenes emitted from plants have an important role in atmospheric chemistry through changing atmospheric oxidative capacity, forming new particles and secondary organic aerosols. The emission rates and patterns can be affected by changing climate. In this study, emission responses to six years of climatic manipulations (elevated CO2, extended summer drought and night-time warming) were investigated in a temperate semi-natural heath ecosystem. Samples for monoterpene analysis were collected in seven campaigns during an entire growing season (April–November, 2011). The results showed that the temperate heath ecosystem was a considerable source of monoterpenes to the atmosphere, with the emission averaged over the 8 month measurement period of 21.7 ± 6.8 μg m− 2 ground area h− 1 for the untreated heath. Altogether, 16 monoterpenes were detected, of which the most abundant were α-pinene, δ-3-carene and limonene. The emissions of these three compounds were positively correlated with light, chamber temperature and litter abundance, but negatively correlated with soil temperature. Elevated CO2 tended to decrease the average monoterpene emissions by 40% over the whole growing season, and significantly reduced emissions in August. Extended summer drought significantly decreased the emission right after the drought treatment period, but also in the late growing season. Night-time warming significantly increased the total emissions (mainly α-pinene) in April, and tended to mitigate the decrease caused by drought. The inhibition effects of elevated CO2 on emissions were diminished when the treatment was combined with drought or warming. The emission responses to different treatments were not explained by vegetation changes, and the monoterpene emission profile was only moderately related to plant species coverage. The emission responses to these long-term climate manipulations varied over the growing season (with strong correlation with litter abundance) and the observed antagonistic effects in the combined treatments underlie the importance of long-term studies with multiple factors acting in concert.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Antagonistic effect, Biogenic volatile organic compound, Calluna vulgaris, Climate manipulation, FACE, Vegetation change
in
Science of the Total Environment
volume
580
pages
12 pages
publisher
Elsevier
external identifiers
  • pmid:27989477
  • scopus:85008414247
ISSN
0048-9697
DOI
10.1016/j.scitotenv.2016.12.060
language
English
LU publication?
yes
id
01fa912e-0ae5-48eb-972c-b80a85f2e034
date added to LUP
2019-06-12 22:04:56
date last changed
2021-05-05 02:28:07
@article{01fa912e-0ae5-48eb-972c-b80a85f2e034,
  abstract     = {<p>Monoterpenes emitted from plants have an important role in atmospheric chemistry through changing atmospheric oxidative capacity, forming new particles and secondary organic aerosols. The emission rates and patterns can be affected by changing climate. In this study, emission responses to six years of climatic manipulations (elevated CO<sub>2</sub>, extended summer drought and night-time warming) were investigated in a temperate semi-natural heath ecosystem. Samples for monoterpene analysis were collected in seven campaigns during an entire growing season (April–November, 2011). The results showed that the temperate heath ecosystem was a considerable source of monoterpenes to the atmosphere, with the emission averaged over the 8 month measurement period of 21.7 ± 6.8 μg m<sup>− 2</sup> ground area h<sup>− 1</sup> for the untreated heath. Altogether, 16 monoterpenes were detected, of which the most abundant were α-pinene, δ-3-carene and limonene. The emissions of these three compounds were positively correlated with light, chamber temperature and litter abundance, but negatively correlated with soil temperature. Elevated CO<sub>2</sub> tended to decrease the average monoterpene emissions by 40% over the whole growing season, and significantly reduced emissions in August. Extended summer drought significantly decreased the emission right after the drought treatment period, but also in the late growing season. Night-time warming significantly increased the total emissions (mainly α-pinene) in April, and tended to mitigate the decrease caused by drought. The inhibition effects of elevated CO<sub>2</sub> on emissions were diminished when the treatment was combined with drought or warming. The emission responses to different treatments were not explained by vegetation changes, and the monoterpene emission profile was only moderately related to plant species coverage. The emission responses to these long-term climate manipulations varied over the growing season (with strong correlation with litter abundance) and the observed antagonistic effects in the combined treatments underlie the importance of long-term studies with multiple factors acting in concert.</p>},
  author       = {Tiiva, Päivi and Tang, Jing and Michelsen, Anders and Rinnan, Riikka},
  issn         = {0048-9697},
  language     = {eng},
  month        = {02},
  pages        = {1056--1067},
  publisher    = {Elsevier},
  series       = {Science of the Total Environment},
  title        = {Monoterpene emissions in response to long-term night-time warming, elevated CO<sub>2</sub> and extended summer drought in a temperate heath ecosystem},
  url          = {http://dx.doi.org/10.1016/j.scitotenv.2016.12.060},
  doi          = {10.1016/j.scitotenv.2016.12.060},
  volume       = {580},
  year         = {2017},
}