Diurnal variation in methane efflux at different growth stages of tropical rice

Satpathy, S. N. ; Rath, A. K. ; Ramakrishnan, B. ; Rao, V. R. ; Adhya, T. K. ; Sethunathan, N. (1997) Diurnal variation in methane efflux at different growth stages of tropical rice Plant and Soil, 195 (2). pp. 267-271. ISSN 0032-079X

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Official URL: http://www.springerlink.com/content/q82255h22g2622...

Related URL: http://dx.doi.org/10.1023/A:1004202515767


Diurnal variation in CH4 efflux from continuously flooded fields planted to rice (Oryza sativa L. cv. IR-36) was examined at different crop growth stages using a closed chamber method during the wet season. CH4 emission showed a distinct diurnal pattern especially at tillering, panicle initiation and maturity stages of a field-grown rice crop, with maximum emission in the early afternoon (12.00 to 15.00) followed by a decline to a minimum around midnight. Among several variables (ambient temperature, flood water temperature, redox potential, soil pH, and root oxidase activity), a significant negative correlation existed between oxidase activity of the root base and diurnal fluctuations in CH4 efflux at tillering stage. Evidence also suggested that redox status in the rhizosphere region and atmospheric, soil, and water temperatures influenced CH4 emission from rice fields probably by their contrasting effects on CH4 production and oxidation.

Item Type:Article
Source:Copyright of this article belongs to Springer.
Keywords:Diurnal Variation; Methane Emission; Plant Growth Stage; Rice Paddies; Root Oxidase Activity; Soil Variables
ID Code:47835
Deposited On:12 Jul 2011 14:23
Last Modified:12 Jul 2011 14:23

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