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  • Key words Humisol  (1)
  • nitrogen fertilizers  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Biological oxidation of nitric oxide in a humisol (1997)
    Springer
    Biology and fertility of soils 24 (1997), S. 294-300 
    Details
    ISSN: 1432-0789
    Keywords: Key words Humisol ; Nitrate ; Nitric oxide ; Nitrite ; Nitrogen dioxide ; Acetylene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Consumption of nitric oxide (NO) in a humisol was studied at 0.1–2 ppmv NO, a range representative of NO concentrations in ammonium-fertilized soil. Denitrification was not a major sink for NO. The principal NO-consuming reaction was a biological oxidation, leading ultimately to nitrate (NO3 –). Nitrogen dioxide (NO2) and nitrite (NO2 –) may have been intermediates in this pathway. An abiological reaction accounted for about 25% of the NO-consuming activity in soil at 90% H2O (d.w.) and 25oC, but contributed relatively more to total NO consumption at higher temperatures. Biological NO-consuming activity was highest at 25oC, while the abiological activity increased exponentially with temperature. The product of the abiological reaction was neither NO3 –, NO2 –, nor nitrous oxide (N2O), and the reaction did not require O2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050246
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of nitrogen fertilizers and moisture content on CH4 and N2O fluxes in a humisol: Measurements in the field and intact soil cores (1995)
    Springer
    Biogeochemistry 29 (1995), S. 199-222 
    Details
    ISSN: 1573-515X
    Keywords: diffusion limitation ; humisol ; methane oxidation ; nitrogen fertilizers ; nitrous oxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Field and laboratory studies were conducted to determine effects of nitrogen fertilizers and soil water content on N2O and CH4 fluxes in a humisol located on the Central Experimental Farm of Agriculture Canada, Ottawa. Addition of 100 kg N ha−1 as either urea or NaNO3 had no significant effect on soil CH4 flux measured using chambers. Fertilization with NaNO3 resulted in a significant but transitory stimulation of N2O production. Inorganic soil N profiles and the potential nitrification rate suggested that much of the NH 4 + from urea hydrolysis was rapidly nitrified. CH4 fluxes measured using capped soil cores agreed well with fluxes measured using field chambers, and with fluxes calculated from soil gas concentration gradients using Fick's diffusion law. This humisol presents an ideal, unstructured, vertically homogeneous system in which to study gas diffusion, and the influence of gas-filled porosity on CH4 uptake. In soil cores gradually saturated with H2O, the relationship of CH4 flux to gas-filled porosity was an exponential rise to a maximum. Steepening CH4 concentration gradients partially compensated for the decreasing diffusion coefficient of CH4 in soil matrix air as water content increased, and diffusion limitation of CH4 oxidation occurred only at water contents 〉 130% (dry weight), or gas-filled porosities 〈 0.2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02186048
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    Paper (German National Licenses)
    Fulltext
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