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DIVISION S-6-SOIL & WATER MANAGEMENT & CONSERVATION

Erosion Effects on Carbon Dioxide Concentration and Carbon Flux from an Ohio Alfisol

^a School of Natural Resour., The Ohio State Univ., 2021 Coffey Rd., Columbus, OH 43210 USA
^b USDA–NRCS Natl. Soil Survey Center, Federal Bldg. Rm. 152, 100 Centennial Mall North, Lincoln, NE 68508 USA

lal.1{at}osu.edu

Carbon dioxide concentrations in soil both reflect and influence soil biological activity and C flux to the atmosphere. We hypothesized that erosion affects CO₂ concentration and C flux from the soil surface because of its effects on soil temperature and water regimes. The soil air concentrations of CO₂ and corresponding temperature and water contents were monitored on slight (SLI), moderate (MOD), severe (SEV), and depositional (DEP) phases at 2-wk intervals between May 1996 and June 1997. The ambient soil CO₂ concentration and CO₂–C flux were determined using gas chromatograph analyses. Seasonal patterns in soil air CO₂ concentrations (ranging from a winter low of 0.56 mL L^-1 to a summer high of 20.90 mL L^-1) predominated over more subtle differences (20–80% variation) due to erosion phase effects. Significantly greater (by 12–37%) CO₂ concentrations for SEV and MOD phases over SLI and DEP were observed mainly during the summer. The effects of the erosion phase on soil CO₂ concentrations appeared to be indirect through its impacts primarily on soil temperature and, presumably, soil biological activity. Soil air CO₂ concentrations were significantly correlated with soil temperature (R² = 0.61) and CO₂–C (R² = 0.65) flux from the soil surface but not with soil water content. Both linear and second-order polynomial regression equations using soil temperature predicted soil CO₂ concentration.

Abbreviations: DEP, depositional • GC, gas chromatography • MOD, moderate • SEV, severe • SLI, slight • SOC, soil organic carbon

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				R. Lal, M. Griffin, J. Apt, L. Lave, and G. Morgan Response to Comments on "Managing Soil Carbon" Science, September 10, 2004; 305(5690): 1567d - 1567d. [Full Text] [PDF]