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  • Redox potential  (2)
  • Springer  (2)
  • American Physical Society
  • 1
    Electronic Resource
    Electronic Resource
    Methane emission and entrapment in flooded rice soils as affected by soil properties (1993)
    Springer
    Biology and fertility of soils 16 (1993), S. 163-168 
    Details
    ISSN: 1432-0789
    Keywords: Greenhouse gases ; Methane emission ; Methane entrapment ; Redox potential ; Rice fields ; Soil organic carbon ; Soil properties ; Soil pH ; Urea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Laboratory incubation experiments were conducted to study the effects of soil chemical and physical properties on CH4 emission and entrapment in 16 selected soils with a pH range of 4.7–8.1, organic matter content of 0.72–2.38%, and soil texture from silt to clay. There was no significant correlation with CH4 emission for most of the important soil properties, including soil aerobic pH (measured before anaerobic incubation), total Kjeldahl N, cation exchange capacity, especially soil organic matter, and soil water-soluble C, which were considered to be critical controlling factors of CH4 emission. A lower CH4 emission was observed in some soils with a higher organic matter content. Differences in soil Fe and Mn contents and their chemical forms contributed to the this observation. A significant correlation between the CH4 emission and the soil organic C content was observed only after stratifying soils into subgroups according to the level of CH4 emission in soils not amended with organic matter. The results also showed that the soil redox potential (Eh), anaerobic pH, anerobic pH, and biologically reducible Fe and Mn affected CH4 emission significantly. Urea fertilization promoted CH4 emission in some soils and inhibited it in others. This result appeared to be related to the original soil pH. CH4 entrapment was positively correlated with soil clay content, indicating the importance of soil physical characteristics in reducing CH4 emissions to the atmosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00361401
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  • 2
    Electronic Resource
    Electronic Resource
    Methane production potentials of twenty-eight rice soils in China (1999)
    Springer
    Biology and fertility of soils 29 (1999), S. 74-80 
    Details
    ISSN: 1432-0789
    Keywords: Key words Methane production ; Flooded soil ; Incubation ; Soil organic matter ; Redox potential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  Soil CH4 production potentials were investigated by incubating air-dried soils under anaerobic conditions in the laboratory. Twenty-eight soils from different fields and locations were collected for this study. Soil CH4 production during a 100-day incubation differed greatly and were significantly correlated with soil organic content (r=0.61, P〈0.01). The statistical significance increased when soils were grouped according to soil reduction rates. A significant correlation was also found between CH4 production and total N content (r=0.64, P〈0.01) and between CH4 production and soil particle sizes of 0.25–0.05 mm (r=0.48, P〈0.05). A negative exponential correlation was found between CH4 production and aerobic soil pH (r=–0.74, P〈0.01). The 28 soils were stratified into four groups on the basis of variation in CH4 production rates which were associated with the soil reduction rate and soil organic content. The faster the Eh of soil fell, the more CH4 was formed. Adding rice straw to Hangzhou and Beijing soils increased CH4 production. The increase in CH4 production was more pronounced in the soil with the lowest organic matter content and slowest reduction rate than in the soil with highest organic matter and fastest reduction rate. Inorganic fertilizer had no significant influence on CH4 production potentials of either type of soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050527
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