Long-term ozone effects on vegetation, microbial community and methane dynamics of boreal peatland microcosms in open-field conditions
(2008) In Global Change Biology 14(8). p.1891-1903- Abstract
- To study the effects of elevated ozone concentration on methane dynamics and a sedge species, Eriophorum vaginatum, we exposed peatland microcosms, isolated by coring from an oligotrophic pine fen, to double ambient ozone concentration in an open-air ozone exposure field for four growing seasons. The field consists of eight circular plots of which four were fumigated with elevated ozone concentration and four were ambient controls. At the latter part of the first growing season (week 33, 2003), the methane emission was 159 +/- 14 mg CH4 m(-2) day(-1) (mean +/- SE) in the ozone treatment and 214 +/- 8 mg CH4 m(-2) day(-1) under the ambient control. However, towards the end of the experiment the ozone treatment slightly, but consistently,... (More)
- To study the effects of elevated ozone concentration on methane dynamics and a sedge species, Eriophorum vaginatum, we exposed peatland microcosms, isolated by coring from an oligotrophic pine fen, to double ambient ozone concentration in an open-air ozone exposure field for four growing seasons. The field consists of eight circular plots of which four were fumigated with elevated ozone concentration and four were ambient controls. At the latter part of the first growing season (week 33, 2003), the methane emission was 159 +/- 14 mg CH4 m(-2) day(-1) (mean +/- SE) in the ozone treatment and 214 +/- 8 mg CH4 m(-2) day(-1) under the ambient control. However, towards the end of the experiment the ozone treatment slightly, but consistently, enhanced the methane emission. At the end of the third growing season (2005), microbial biomass (estimated by phospholipid fatty acid biomarkers) was higher in peat exposed to ozone (1975 +/- 108 nmol g(-1) dw) than in peat of the control microcosms (1589 +/- 115 nmol g(-1) dw). The concentrations of organic acids in peat pore water showed a similar trend. Elevated ozone did not affect the shoot length or the structure of the sedge E. vaginatum leaves but it slightly increased the total number of sedge leaves towards the end of the experiment. Our results indicate that elevated ozone concentration enhances the general growth conditions of microbes in peat by increasing their substrate availability. However, the methane production did not reflect the increase in the concentration of organic acids, probably because hydrogenotrophic methane production dominated in the peat studied. Although, we used isolated peatland microcosms with limited size as study material, we did not find experimental factors that could have hampered the basic conclusions on the effects of ozone. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1254982
- author
- Morsky, Sami K. ; Haapala, Jaana K. ; Rinnan, Riikka LU ; Tiiva, Paivi ; Saarnio, Sanna ; Silvola, Jouko ; Holopainen, Toini and Martikainen, Pertti J.
- organization
- publishing date
- 2008
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- sedge, PLFA, peatland, organic acid, microcosm, Eriophorum vaginatum, methane, wetland, tropospheric ozone
- in
- Global Change Biology
- volume
- 14
- issue
- 8
- pages
- 1891 - 1903
- publisher
- Wiley-Blackwell
- external identifiers
-
- wos:000257712400013
- scopus:48949120697
- ISSN
- 1354-1013
- DOI
- 10.1111/j.1365-2486.2008.01615.x
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Microbial Ecology (Closed 2011) (011008001)
- id
- e51c6132-085f-4154-8e78-a9cb7d5eda32 (old id 1254982)
- date added to LUP
- 2016-04-01 11:49:11
- date last changed
- 2022-04-05 05:33:49
@article{e51c6132-085f-4154-8e78-a9cb7d5eda32,
abstract = {{To study the effects of elevated ozone concentration on methane dynamics and a sedge species, Eriophorum vaginatum, we exposed peatland microcosms, isolated by coring from an oligotrophic pine fen, to double ambient ozone concentration in an open-air ozone exposure field for four growing seasons. The field consists of eight circular plots of which four were fumigated with elevated ozone concentration and four were ambient controls. At the latter part of the first growing season (week 33, 2003), the methane emission was 159 +/- 14 mg CH4 m(-2) day(-1) (mean +/- SE) in the ozone treatment and 214 +/- 8 mg CH4 m(-2) day(-1) under the ambient control. However, towards the end of the experiment the ozone treatment slightly, but consistently, enhanced the methane emission. At the end of the third growing season (2005), microbial biomass (estimated by phospholipid fatty acid biomarkers) was higher in peat exposed to ozone (1975 +/- 108 nmol g(-1) dw) than in peat of the control microcosms (1589 +/- 115 nmol g(-1) dw). The concentrations of organic acids in peat pore water showed a similar trend. Elevated ozone did not affect the shoot length or the structure of the sedge E. vaginatum leaves but it slightly increased the total number of sedge leaves towards the end of the experiment. Our results indicate that elevated ozone concentration enhances the general growth conditions of microbes in peat by increasing their substrate availability. However, the methane production did not reflect the increase in the concentration of organic acids, probably because hydrogenotrophic methane production dominated in the peat studied. Although, we used isolated peatland microcosms with limited size as study material, we did not find experimental factors that could have hampered the basic conclusions on the effects of ozone.}},
author = {{Morsky, Sami K. and Haapala, Jaana K. and Rinnan, Riikka and Tiiva, Paivi and Saarnio, Sanna and Silvola, Jouko and Holopainen, Toini and Martikainen, Pertti J.}},
issn = {{1354-1013}},
keywords = {{sedge; PLFA; peatland; organic acid; microcosm; Eriophorum vaginatum; methane; wetland; tropospheric ozone}},
language = {{eng}},
number = {{8}},
pages = {{1891--1903}},
publisher = {{Wiley-Blackwell}},
series = {{Global Change Biology}},
title = {{Long-term ozone effects on vegetation, microbial community and methane dynamics of boreal peatland microcosms in open-field conditions}},
url = {{http://dx.doi.org/10.1111/j.1365-2486.2008.01615.x}},
doi = {{10.1111/j.1365-2486.2008.01615.x}},
volume = {{14}},
year = {{2008}},
}