Journal
SOIL BIOLOGY & BIOCHEMISTRY
Volume 62, Issue -, Pages 28-35Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2013.02.014
Keywords
Ammonia oxidising archaea; Ammonia oxidising bacteria; Denitrification; N-15; qPCR; Liming; Nitrification
Categories
Funding
- Australian Government
- Grains Research and Development Corporations Soil Biology Initiative II
- Australian Research Council
- Australian Research Council [DP0985832, FT110100246]
- Consejo Nacional de Ciencia y Tecnologia (CONACyT, Mexico) [213294]
- Australian Research Council [DP0985832, FT110100246] Funding Source: Australian Research Council
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Nitrous oxide (N2O) emissions in semi-arid regions are often greater following summer rainfall events when the soil is fallow, than in response to N fertiliser applications during crop growth. Nitrogen fertiliser management strategies are therefore likely to be ineffective at mitigating N2O emissions from these cropped agricultural soils. Here we examined the influence of raising soil pH on N2O emissions, nitrification rates, and both nitrifier and denitrifier populations following simulated summer rainfall events. The soil pH was raised by applying lime to a field site 12 months before conducting the laboratory experiment, resulting in soil of contrasting pH (4.21 or 6.34). Nitrous oxide emissions ranged from 0 when the soil was dry to 0.065 mu g N2O-N g dry soil(-1) h(-1) following soil wetting; which was attributed to both denitrification and nitrification. Increasing soil pH only decreased N2O emissions when losses were associated with nitrification, and increased amoA gene copy numbers. We propose increasing soil pH as a strategy for decreasing soil N2O emissions from acidic soils following summer rainfall in semiarid regions when emissions result from nitrification. (C) 2013 Elsevier Ltd. All rights reserved.
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