Methane production in Minnesota peatlands
Rates of methane production in Minnesota peats were studied. Surface (10- to 25-cm) peats produced an average of 228 nmol of CH/sub 4/ per g (dry weight) per h at 25/sup 0/C and ambient pH. Methanogenesis rates generally decreased with depth in ombrotrophic peats, but on occasion were observed to rise within deeper layers of certain fen peats. Methane production was temperature dependent, increasing with increasing temperature (4 to 30/sup 0/C), except in peats from deeper layers. Maximal methanogenesis from these deeper regions occurred at 12/sup 0/C. Methane production rates were also pH dependent. Two peats with pHs of 3.8 and 4.3 had an optimum rate of methane production at pH 6.0. The addition to peat of glucose and H/sub 2/-CO/sub 2/ stimulated methanogenesis, whereas the addition of acetate inhibited methanogenesis. Cysteine-sulfide, nitrogen-phosphorus-trace metals, and vitamins-yeast extract affected methane production very little. Various gases were found to be trapped or dissolved (or both) within peatland waters. Dissolved methane increased linearly to a depth of 210 cm. The accumulation of metabolic end products produced within peat bogs appears to be an important mechanism limiting turnover in peatland environments.
- Research Organization:
- Univ. of Minnesota, Navarre
- OSTI ID:
- 6384382
- Journal Information:
- Appl. Environ. Microbiol.; (United States), Vol. 47:6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
ACETIC ACID
CARBONIC ACID
GLUCOSE
INHIBITION
MINNESOTA
PH VALUE
RESPONSE MODIFYING FACTORS
STIMULATION
SULFATES
TEMPERATURE
ALDEHYDES
ALKANES
AQUATIC ECOSYSTEMS
CARBOHYDRATES
CARBON COMPOUNDS
CARBOXYLIC ACIDS
ECOSYSTEMS
ENERGY SOURCES
FEDERAL REGION V
FOSSIL FUELS
FUELS
HEXOSES
HYDROCARBONS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MONOCARBOXYLIC ACIDS
MONOSACCHARIDES
NORTH AMERICA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC MATTER
OXYGEN COMPOUNDS
SACCHARIDES
SULFUR COMPOUNDS
SYNTHESIS
USA
090122* - Hydrocarbon Fuels- Preparation from Wastes or Biomass- (1976-1989)
010500 - Coal
Lignite
& Peat- Products & By-Products