ISSN:
1573-515X
Keywords:
methane balance
;
methane emission
;
methane oxidation
;
methane production
;
paddy soil
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Geosciences
Notes:
Abstract In rice microcosms (Oryza sativa, var. Roma, type japonica),CH4 emission, CH4 production, CH4oxidation and CH4 accumulation were measured over an entirevegetation period. Diffusive CH4 emission was measured inclosed chambers, CH4 production was measured in soil samples,CH4 oxidation was determined from the difference between oxicand anoxic emissions, and CH4 accumulation was measured byanalysis of porewater and gas bubbles. The sum of diffusiveCH4 emission, CH4 oxidation, andCH4 accumulation was only 60% of the cumulativeCH4 production. The two values diverged during the first 50days (vegetative phase) and then again during the last 50 days (latereproductive phase and senescence) of the 150 day vegetation period. Duringthe period of day 50–100 (early reproductive phase/flowering), theprocesses were balanced. Most likely, gas bubbles and diffusion limitationare responsible for the divergence in the early and late phases. The effectof rice on CH4 production rates and CH4concentrations was studied by measuring these processes also in unplantedmicrocosms. Presence of rice plants lowered the CH4concentrations, but had no net effect on the CH4 productionrates.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1005909313026
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