Advanced

Below ground carbon turnover and greenhouse gas exchanges in a sub-arctic wetland.

Ström, Lena LU and Christensen, Torben LU (2007) In Soil Biology & Biochemistry 39(7). p.1689-1698
Abstract
Here we present results from a field experiment in a sub-arctic wetland near Abisko, northern Sweden, where the permafrost is currently disintegrating with significant vegetation changes as a result. During one growing season we investigated the fluxes of CO2 and CH4 and how they were affected by ecosystem properties, i.e., composition of species that are currently expanding in the area (Carex

rotundata, Eriophorum vaginatum and Eriophorum angustifolium), dissolved CH4 in the pore water, substrate availability for methane producing bacteria, water table depth, active layer, temperature, etc. We found that the measured gas fluxes over the season ranged

between: CH4 0.2 and 36.1 mgCH4m-2 h-1, Net Ecosystem Exchange (NEE)... (More)
Here we present results from a field experiment in a sub-arctic wetland near Abisko, northern Sweden, where the permafrost is currently disintegrating with significant vegetation changes as a result. During one growing season we investigated the fluxes of CO2 and CH4 and how they were affected by ecosystem properties, i.e., composition of species that are currently expanding in the area (Carex

rotundata, Eriophorum vaginatum and Eriophorum angustifolium), dissolved CH4 in the pore water, substrate availability for methane producing bacteria, water table depth, active layer, temperature, etc. We found that the measured gas fluxes over the season ranged

between: CH4 0.2 and 36.1 mgCH4m-2 h-1, Net Ecosystem Exchange (NEE) -1000 and 1250 mgCO2m-2 h-1 (negative values meaning a sink of atmospheric CO2) and dark respiration 110 and 1700 mgCO2m-2 h-1. We found that NEE, photosynthetic rate and CH4 emission were affected by the species composition. Multiple stepwise regressions indicated that the primary explanatory variables for

NEE was photosynthetic rate and for respiration and photosynthesis biomass of green leaves. The primary explanatory variables for CH4 emissions were depth of the water table, concentration of organic acid carbon and biomass of green leaves. The negative correlations between pore water concentration and emission of CH4 and the concentrations of organic acid, amino acid and

carbohydrate carbon indicated that these compounds or their fermentation by-products were substrates for CH4 formation. Furthermore, calculation of the radiative forcing of the species expanding in the area as a direct result of permafrost degradation and a change in hydrology indicate that the studied mire may act as an increasing source of radiative forcing in future. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Soil Biology & Biochemistry
volume
39
issue
7
pages
1689 - 1698
publisher
Elsevier
external identifiers
  • wos:000246633700029
  • scopus:34247274166
ISSN
0038-0717
DOI
10.1016/j.soilbio.2007.01.019
language
English
LU publication?
yes
id
9f737d3b-ec26-438f-9759-1358de33cc5d (old id 619474)
date added to LUP
2007-12-17 13:35:00
date last changed
2017-09-10 04:40:08
@article{9f737d3b-ec26-438f-9759-1358de33cc5d,
  abstract     = {Here we present results from a field experiment in a sub-arctic wetland near Abisko, northern Sweden, where the permafrost is currently disintegrating with significant vegetation changes as a result. During one growing season we investigated the fluxes of CO2 and CH4 and how they were affected by ecosystem properties, i.e., composition of species that are currently expanding in the area (Carex<br/><br>
rotundata, Eriophorum vaginatum and Eriophorum angustifolium), dissolved CH4 in the pore water, substrate availability for methane producing bacteria, water table depth, active layer, temperature, etc. We found that the measured gas fluxes over the season ranged<br/><br>
between: CH4 0.2 and 36.1 mgCH4m-2 h-1, Net Ecosystem Exchange (NEE) -1000 and 1250 mgCO2m-2 h-1 (negative values meaning a sink of atmospheric CO2) and dark respiration 110 and 1700 mgCO2m-2 h-1. We found that NEE, photosynthetic rate and CH4 emission were affected by the species composition. Multiple stepwise regressions indicated that the primary explanatory variables for<br/><br>
NEE was photosynthetic rate and for respiration and photosynthesis biomass of green leaves. The primary explanatory variables for CH4 emissions were depth of the water table, concentration of organic acid carbon and biomass of green leaves. The negative correlations between pore water concentration and emission of CH4 and the concentrations of organic acid, amino acid and<br/><br>
carbohydrate carbon indicated that these compounds or their fermentation by-products were substrates for CH4 formation. Furthermore, calculation of the radiative forcing of the species expanding in the area as a direct result of permafrost degradation and a change in hydrology indicate that the studied mire may act as an increasing source of radiative forcing in future.},
  author       = {Ström, Lena and Christensen, Torben},
  issn         = {0038-0717},
  language     = {eng},
  number       = {7},
  pages        = {1689--1698},
  publisher    = {Elsevier},
  series       = {Soil Biology & Biochemistry},
  title        = {Below ground carbon turnover and greenhouse gas exchanges in a sub-arctic wetland.},
  url          = {http://dx.doi.org/10.1016/j.soilbio.2007.01.019},
  volume       = {39},
  year         = {2007},
}