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TECHNICAL REPORT
Atmospheric Pollutants and Trace Gases

Effect of Land Use on Methane Flux from Soil

^a Dep. of Microbiology, Iowa State Univ., Ames, IA 50011
^b USDA-ARS, National Soil Tilth Lab., 2150 Pammel Drive, Ames, IA 50011

Corresponding author (parkin{at}nstl.gov)

Received for publication June 21, 2000. The precise effects of natural and disturbed terrestrial systems on the atmospheric CH₄ pool are uncertain. This study was conducted to quantify and compare CH₄ fluxes from a variety of ecosystems in central Iowa. We investigated agricultural systems under different management practices, a hardwood forest site, native and restored prairies, and a municipal landfill. Flux measurements were obtained using a closed-chamber method, and measurements were compiled by sampling over the 1993 and 1994 growing seasons. In 1993, most of the agricultural sites were net CH₄ producers with cumulative CH₄ fluxes ranging from -0.02 to 3.19 g m^-2 over the 258-d sampling season, while the natural ecosystems were net CH₄ consumers, with cumulative seasonal fluxes ranging from -0.27 to -0.07 g m^-2 258 d^-1. In 1994, only the landfill and the agricultural site treated with broadcast liquid swine manure (LSM) were net CH₄ producers, while the remainder of the natural and agricultural ecosystems were net CH₄ consumers, with mean seasonal flux rates ranging from -0.43 to -0.008 g m^-2 271 d^-1. We hypothesize that the differences in CH₄ fluxes between the two years are due to differences in rainfall. To illustrate the integration between land use and CH₄ flux, we computed an area-weighted soil CH₄ flux for the state of Iowa. Our calculations yielded a net average soil CH₄ flux of 139000 Mg CH₄ for 1993 and 1994.

Abbreviations: LSM, liquid swine manure

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