Abiotic nitrous oxide production from hydroxylamine in soils and their dependence on soil properties |
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| Institution: | 1. Forschungszentrum Jülich GmbH, Agrosphere (IBG-3), 52425 Jülich, Germany;2. University of Bonn, Faculty of Agriculture, Institute of Crop Science and Resource Conservation (INRES), Nussallee 13, 53115 Bonn, Germany;1. Landcare Research, Palmerston North, New Zealand;2. Landcare Research, Lincoln, New Zealand;3. AgResearch, Hamilton, New Zealand;1. Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China;2. State Key Laboratory for Biology of Plant Disease and Insect Pests, Beijing, China;1. Thünen Institute of Climate-Smart Agriculture, Federal Research Institute for Rural Areas, Forestry and Fisheries, Bundesallee 50, D-38116 Braunschweig, Germany;2. Institute of Geological Sciences, University of Wroc?aw, Cybulskiego 30, PL-50-205 Wroclaw, Poland;3. Institute of Plant Nutrition and Soil Science, Kiel University, Hermann-Rodewald-Str. 2, D-24118 Kiel, Germany;4. Institute of Plant Nutrition and Environmental Science, Research Center Hanninghof, Yara Int. ASA, Hanninghof 35, D-48249 Dülmen, Germany;5. Institute of Applied Plant Nutrition, University of Göttingen, Carl-Sprengel-Weg 1, D-37075 Göttingen, Germany;6. Department of Crop Science, Section of Plant Nutrition and Crop Physiology, University of Göttingen, Carl-Sprengel-Weg 1, D-37075 Göttingen, Germany;1. Ministry of Agriculture Key Laboratory of Crop Nutrition and Fertilization, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China;2. School of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China;3. Center of Agricultural Environment and Resource, Jilin Academy of Agricultural Sciences, Changchun 136000, China;4. Ministry of Education Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China;5. AgResearch, Private Bag 4749, Lincoln, Christchurch 8140, New Zealand |
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| Abstract: | Despite the fact that microbial nitrification and denitrification are considered the major soil N2O emission sources, especially from agricultural soils, several abiotic reactions involving the nitrification intermediate hydroxylamine (NH2OH) have been identified leading to N2O emissions, but are being neglected in most current studies. Here, we studied N2O formation from NH2OH in cropland, grassland, and forest soils in laboratory incubation experiments. Incubations were conducted with and without the addition of NH2OH to non-sterile and sterile soil samples. N2O evolution was quantified with gas chromatography and further analyzed with online laser absorption spectroscopy. Additionally, the isotopic signature of the produced N2O (δ15N, δ18O, and 15N site preference) was analyzed with isotope ratio mass spectrometry. While the forest soil samples showed hardly any N2O evolution upon the addition of NH2OH, immediate and very large formation of N2O was observed in the cropland soil, also in sterilized samples. Correlation analysis revealed soil parameters that might explain the variability of NH2OH-induced N2O production to be: soil pH, C/N ratio, and Mn content. Our results suggest a coupled biotic–abiotic production of N2O during nitrification, e.g. due to leakage of the nitrification intermediate NH2OH with subsequent reaction with the soil matrix. |
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| Keywords: | Coupled biotic–abiotic process Nitrification Intermediate |
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