Temperature effects on ammonification and nitrification in a tropical soil |
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| Authors: | RJK Myers |
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| Institution: | Division of Land Use Research, CSIRO, Canberra, A.C.T., Australia |
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| Abstract: | Ammonification of soil organic N and nitrification of ammonium-N was studied in Tindall clay loam over a range of temperatures from 20–60 C. Nitrification rates at each temperature were constant throughout the 28 day incubation, whereas most of the ammonification occurred in the first 7 days. The optimum for nitrification was close to 35 C. exhibiting a sharp peak at this temperature at which the potential rate was 4.8 μg N/g day?1, compared with 0.5 μg N/g day?1 at 20°C and 0.25 μg N/g day?1 at 60°C. The optimum temperature for ammonification was approximately 50°C at which the rate was 2.8 μg N/g day?1 in the first 7 days but only 0.5 μg N/g day?1 between 14 and 28 days.The temperature responses could be described mathematically with functions of the type logoN = k × 1/T.The results are discussed in relation to daily patterns of N mineralization in the field where temperatures show diurnal fluctuation. |
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