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DIVISION S-6-SOIL & WATER MANAGEMENT & CONSERVATION

Diurnal and Seasonal CO²–C Flux from Soil as Related to Erosion Phases in Central Ohio

^a School of Natural Resources, The Ohio State Univ., 2021 Coffey Rd., Columbus, OH 43210 USA
^b National Soil Survey Center, USDA-NRCS, 100 Centennial Mall North, Rm. 152., Lincoln, NE 68508-3868 USA

rmbajra{at}ccsl.com.np

The CO₂–C flux from soil is an important part of the global C cycle, whose dependence on erosion is as yet largely unknown. We hypothesized that the magnitude of diurnal and seasonal C flux is related to soil erosion phase and is influenced by soil water and temperature regimes. The CO₂–C flux from the surface of a Miamian silt loam soil (fine, mixed, active, mesic Oxyaquic Hapludalf) in central Ohio was monitored using the static chamber method. Gas samples were collected four times daily (at 0900, 1200, 1500 and 1800 h) at 2-wk intervals between July 1995 and June 1997. The CO₂ evolved from the soil surface varied significantly among seasons ranging from 0 g C m^-2 d^-1 in the winter to 1.6 g C m^-2 d^-1 during the summer. Soil erosion phase had no direct effect on C flux from the soil, although depositional areas had 20 to 25% higher water content than other phases, while severely eroded and depositional areas generally had higher soil temperatures than slightly and moderately eroded phases. Soil C flux exhibited diurnal variations with high values differing from lows by as much as 0.04 g C m^-2 h^-1. Peak flux rates as high as 0.082 g C m^-2 h^-1 occurred during the mid afternoon during the spring, summer, and autumn seasons. Soil C flux was significantly correlated with soil temperature and air temperature but not with soil moisture content.

Abbreviations: CT, conventional tillage • DEP, deposition phase • GC, gas chromatograph • NT, no-tillage • MOD, moderately eroded • PVC, polyvinyl chloride • SEV, severely eroded • SLI, slightly eroded • SOC, soil organic C

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