Methane Production and Consumption in Loess Soil at Different Slope Position

Figure 2

Changes of CH₄, CO₂, and O₂ over time in loess soils collected from three slope positions and incubated with added methane, 5 kPa (methanotrophic potential). Top: summit, Middle: back slope, Bottom: bottom of the slope. Upper graphs (a–c) upper soil depth of 0–20 cm; lower graphs (d–f) lower soil depth of 20–40 cm. (a) and (d) cumulative CH₄ production; (b) and (e) cumulative CO₂ production; (c) and (f)—changes in O₂ in the headspace. Points represent triplicate-means with standard error.

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(b)

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(f)