NDLI: Effect of temperature on reduction of iron and production of carbon dioxide and methane in anoxic wetland rice soils

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Biology and Fertility of Soils : Volume 32, Issue 1, October 2000

Biology and Fertility of Soils : Volume 31

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Effect of temperature on reduction of iron and production of carbon dioxide and methane in anoxic wetland rice soils

Content Provider	Springer Nature Link
Author	Yao, H. Conrad, R.
Copyright Year	2000
Abstract	Wetland rice soils from Italy (Pavia) and the Philippines (Bugallon, Luisiana, Maligaya) were incubated under anoxic conditions at 31 different temperatures ranging from 4.7 °C to 49.5 °C. Production of CO2 was most intensive at the beginning of the incubation (0–4 days) and was predominantly coupled to the reduction of free Fe(III). The optimum temperature for these processes was between 32 °C and 41 °C. After 9–16 days, CO2 production rates had decreased and the available Fe(III) had been completely reduced at the optimum temperatures. However, Fe(III) was still available at temperatures below and above the optimum. Maximum CH4 production rates were observed after 4–16 days (except in soil from Maligaya) with temperature optima between 32 °C and 41 °C, similar to those for CO2 production and Fe reduction. Since ongoing Fe reduction is known to suppress CH4 production, the temperature range of optimum CH4 production was restricted to those temperatures at which Fe(III) had already been depleted. Nevertheless, the temperature characteristics of both CO2 and CH4 production often exhibited two temperature optima at some time during the incubation, suggesting a complex pattern of adaptation of the methanogenic microbial community to temperature. When available Fe(III) was completely depleted by anoxic pre-incubation at 30 °C, CH4 was produced at a constant rate (steady state conditions) which increased with increasing temperature. Steady state CH4 production reached a first maximum at about 40 °C, but increased further up to at least 50 °C, suggesting the presence of thermophilic microorganisms whose activity was apparently masked when Fe had not been completely reduced. The apparent activation energy of CH4 production at steady state ranged between 48 kJ mol–1 and 65 kJ mol–1.
Starting Page	135
Ending Page	141
Page Count	7
File Format	PDF
ISSN	01782762
Journal	Biology and Fertility of Soils
Volume Number	32
Issue Number	2
e-ISSN	14320789
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-10-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science Microbiology

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