Spatial distribution of methane-oxidizing activity in a flooded rice soil

Kumaraswamy, S. ; Ramakrishnan, B. ; Satpathy, S. N. ; Rath, A. K. ; Misra, S. ; Rao, V. R. ; Sethunathan, N. (1997) Spatial distribution of methane-oxidizing activity in a flooded rice soil Plant and Soil, 191 (2). pp. 241-248. ISSN 0032-079X

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In a study on spatial distribution of methane oxidation in an unplanted flooded field, methane-oxidizing activity, analysed in soil samples under laboratory conditions, decreased with increasing depth (25 cm and beyond). In a flooded field planted to rice, rates of methane oxidation followed the order : rhizosphere (collected from roots at 10-20 cm depth) > surface soil at (0-1 cm) > subsurface soil at 10-20 cm depth, diagonally 10-15 cm away from the centre of hill. Application of ammonium sulfate and, to a lesser extent, urea to surface, rhizosphere and subsurface soil samples from flooded field planted to rice effected a distinct inhibition of methane oxidation. Nitrification inhibitors (thiourea, sodium thiosulfate and dicyandiamide) were also effective in inhibiting methane oxidation. Both surface and rhizosphere soil samples harbored higher populations of methane-oxidizing bacteria than the subsurface soil. Inhibition of methane oxidation in surface and rhizosphere soil samples concomitant with the suppression of autotrophic ammonium oxidizers by nitrification inhibitors implicates an active involvement of autotrophic ammonium oxidizers in methane oxidation.

Item Type:Article
Source:Copyright of this article belongs to Springer.
Keywords:Flooded Rice Soil; Methane Oxidation; Nitrogen Fertilizers; Nitrification Inhibitors
ID Code:47836
Deposited On:12 Jul 2011 14:23
Last Modified:12 Jul 2011 14:23

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