Fig. 6. Relationship between soil inorganic N concentrations and methane oxidation rates as determined in incubations with ambient headspace CH₄ concentrations (A) and elevated headspace CH₄ concentrations (1% CH₄) (B). McF = McFarland Forest; Dp = Doolittle Prairie; Rp = Roadside Prairie; Kc = Kluever Control; Kn = Kluever Nitrogen; Kb = Kluever Broadcast Manure; Ki = Kluever Injected Manure; Wht = Walnut Creek Hilltop; Wss = Walnut Creek Sideslope; Wph = Walnut Creek Pothole; Df = Doolittle Farm; Rf = Roadside Farm.