Soil redox and pH effects on methane production in a flooded rice soil

Journal Article · · Soil Science Society of America Journal; (United States)

DOI:https://doi.org/10.2136/sssaj1993.03615995005700020016x· OSTI ID:6225730

Wang, Z P; DeLaune, R D; Patrick, Jr, W H ^[1]; Masscheleyn, P H ^[2]

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1. Louisiana State Univ., Baton Rouge (United States)
2. Ghent Univ. (Belgium)

Methane formation in soil is a microbiological process controlled by many factors. Of them soil redox potential (Eh) and soil pH are considered critical controls. A laboratory incubation experiment was conducted to study the critical initiation soil Eh, the optimum soil pH, and the interaction of Eh and pH on CH[sub 4] production. The critical soil Eh for initiation of CH[sub 4] production observed was approximately from [minus]150 to [minus]160 mV. Between [minus]230 and [minus]150 mV, the relationship of CH[sub 4] production and soil Eh appeared to be negatively exponential (Y = a10[sup [minus]bx], where Y is the CH[sub 4] production rate, [mu]g g[sup [minus]1] d[sup [minus]1]: x the soil Eh, mV; and a and b are constants). The optimum pH of CH[sub 4] production was near neutrality. A small decrease in pH resulting from the introduction of acidic materials significantly decreased CH[sub 4] production. A slight increase in soil pH (about 0.2 unit higher than the natural soil suspension pH), however, resulted in an enhancement of CH[sub 4] production by 11 to 20% and 24 to 25% at controlled Eh of [minus]250 and [minus]200 mV, respectively. Results suggest that a decrease in CH[sub 4] emissions could be obtained by a small reduction in soil pH in Crowley soil (fine, montmorillonitic, thermic Typic Albaqualf). 19 refs., 3 figs., 3 tabs.

• OSTI ID: 6225730
• Journal Information: Soil Science Society of America Journal; (United States), Journal Name: Soil Science Society of America Journal; (United States) Vol. 57:2; ISSN 0361-5995; ISSN SSSJD4
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
090800* -- Biomass Fuels-- Production-- (1990-)
095000 -- Biomass Fuels-- Environmental Aspects-- (1990-)
AGRICULTURE
ALKANES
BACTERIA
BIOSYNTHESIS
CEREALS
CLIMATIC CHANGE
DATA
EXPERIMENTAL DATA
GRAMINEAE
GREENHOUSE EFFECT
HYDROCARBONS
INFORMATION
LILIOPSIDA
LOAM
MAGNOLIOPHYTA
METHANE
METHANOGENIC BACTERIA
MICROORGANISMS
NUMERICAL DATA
ORGANIC COMPOUNDS
PH VALUE
PLANTS
REDOX POTENTIAL
RICE
SOILS
STRAW
SYNTHESIS