Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 60591
Title Effects of alternative electron acceptors and temperature on methanogenesis in rice paddy soils
Author(s) Bodegom, P.M. van; Stams, A.J.M.
Source Chemosphere 39 (1999)2. - ISSN 0045-6535 - p. 167 - 182.
DOI http://dx.doi.org/10.1016/S0045-6535(99)00101-0
Department(s) Theoretical Production Ecology
Microbiological Laboratory
PE&RC
Publication type Refereed Article in a scientific journal
Publication year 1999
Abstract Soil slurries collected from rice paddies were incubated anaerobically at different temperatures. Changes in the composition of electron acceptors and electron donors in the slurries were monitored daily. During the incubation NO3- was reduced first, followed by Fe3 and SO42- reduction and methane production. The first two steps in the reduction sequence were exclusive, while competition occurred between sulfate reducers and methanogens. The temperature dependence of the reduction processes was expressed in a Q10 value, which was 2.4 for iron reduction, 1.6 for sulfate reduction and 4.6 for methane production. This means that from 14 oC to 30 oC methane formation rates increased 5.4 times as fast as sulfate reduction rates. This was explained by a change in the competition for acetate and can be due to different temperature responses for acetoclastic methanogens in Qmax or KM than for sulfate reducers. Temperature thus not only influenced conversion rates, but also the competitiveness of organisms. CO2 release during the incubation could be explained with the measured inorganic electron acceptors. Organic electron acceptors do thus not seem important in rice paddies.
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