Simultaneous inhibition of CH4 efflux and stimulation of sulphate reduction in peat subject to simulated acid rain

Acid rain sulphate (SO₄²⁻) deposition is a known suppressant of methane (CH4) emission from wetlands. However, the hypothesised mechanism responsible for this important biogeochemical interaction, competitive exclusion of methanogens by dissimilatory SO₄²⁻ reducing bacteria (SRB), lacks supporting e...

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Bibliographic Details
Published inSoil biology & biochemistry Vol. 38; no. 12; pp. 3506 - 3510
Main Authors Gauci, Vincent, Chapman, Stephen J.
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Science 01.12.2006
New York, NY
Subjects
acid deposition
Agronomy. Soil science and plant productions
Biochemistry and biology
Biological and medical sciences
Chemical, physicochemical, biochemical and biological properties
Fundamental and applied biological sciences. Psychology
gas emissions
gas production (biological)
methane
methanogens
peat soils
peatlands
Physics, chemistry, biochemistry and biology of agricultural and forest soils
pollution
Scotland
soil bacteria
Soil science
sulfate-reducing bacteria
sulfates
wetland soils
Scotland
Methane
SRB
Competitive exclusion
Bogs
Methanogens
Peatlands
Acid rain
Stimulation
Sulfates
Peat
Peat bog
Sulphate reduction
Emissions
Wetlands
Sulphate
Simulation
Atmosphere
Methanogenic bacteria
Bacteria
Soil science
Inhibition
Sulfate
Wetland
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Summary:Acid rain sulphate (SO₄²⁻) deposition is a known suppressant of methane (CH4) emission from wetlands. However, the hypothesised mechanism responsible for this important biogeochemical interaction, competitive exclusion of methanogens by dissimilatory SO₄²⁻ reducing bacteria (SRB), lacks supporting evidence. Here, we present data from an acid rain simulation experiment in the Moidach More peat bog of NE Scotland that strengthens this hypothesis. We report a tenfold increase in estimated SO₄²⁻ reduction during periods when measured CH4 emission rates were suppressed relative to controls receiving only one-tenth the SO₄²⁻ of treated plots, but no treatment effect on potential methane oxidation. This tenfold increase in estimated SO₄²⁻ reduction indicates the presence of a more active population of SRB in plots where CH4 emissions were reduced by over 30%.
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ISSN:0038-0717
DOI:10.1016/j.soilbio.2006.05.011