Methane uptake in agricultural and old-field ecosystems
- Kellogg Biological Station, Hickory Corners, MI (United States) Michigan State Univ., East Lansing (United States)
Atmospheric methane (CH[sub 4]) concentrations are rising approximately 1% per year, with important consequences for the earth's radiation balance and tropospheric chemistry. Sources of this increase are not well known; recent evidence suggests that land conversion to agriculture may play some role in this increase if CH[sub 4] consumption in upland soils is suppressed by agronomic activities. We tested this hypothesis in a series of replicated agricultural and old-field communities at the KBS LTER site in southwest Michigan. We measured CH[sub 4] flux with static chambers in 6 different cropping systems (conventional till and no-till annual crops, ridge-till organic based crops, perennial crops) and in early successional and mid-succession (never tilled) old field communities. Chambers were sampled 17 times over the 1992 growing season and analyzed for CH[sub 4], N[sub 2]O, and CO[sub 2]. We found significant but highly variable CH[sub 4] uptake on some dates in all 8 ecosystem types, with most consistent consumption in the organic based crops and old-field communities.
- OSTI ID:
- 6244764
- Report Number(s):
- CONF-930798-; CODEN: BECLAG
- Journal Information:
- Bulletin of the Ecological Society of America; (United States), Vol. 74:2; Conference: 78. annual Ecological Society of America (ESA) meeting, Madison, WI (United States), 31 Jul - 4 Aug 1993; ISSN 0012-9623
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FARMS
ENVIRONMENTAL EFFECTS
METHANE
ECOLOGICAL CONCENTRATION
SOILS
SOIL CHEMISTRY
AGRICULTURE
CROPS
ECOLOGICAL SUCCESSION
GLOBAL ASPECTS
LAND USE
MICHIGAN
TERRESTRIAL ECOSYSTEMS
UPTAKE
ALKANES
CHEMISTRY
DEVELOPED COUNTRIES
ECOSYSTEMS
HYDROCARBONS
NORTH AMERICA
ORGANIC COMPOUNDS
USA
540220* - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)