The effects of acid nitrogen and acid sulphur deposition on CH4 oxidation in a forest soil: a laboratory study |
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| Affiliation: | 1. Institute of Terrestrial Ecology, Merlewood Research Station, Windermere Road, Grange-over-Sands, Cumbria, LA11 6JU, UK;2. University of Exeter, Department of Biological Sciences, Prince of Wales Road, Exeter, Devon, EX4 4PS, UK;3. Uppsala University, Institute of Earth Sciences, Physical Geography, Villavägen 16, S-752 36 Uppsala, Sweden.;1. Institut de Recherche pour le Développement (IRD), UMR LSTM, Montpellier, France;2. Laboratoire Commun de Microbiologie IRD/ISRA/UCAD, Dakar, Senegal;1. Ural Federal University, Laboratory of Magnetic Sensors, Ekaterinburg, Russia;2. Universidad Pais Vasco UPV-EHU, BC Materials, Bilbao, Spain;3. Instituto de Ciencia de Materiales de Madrid, Madrid, Spain;1. Soil Biology and Molecular Ecology Group, School of Earth & Environment (M087), UWA Institute of Agriculture, Faculty of Science, The University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia;2. School of Agricultural & Resource Economics (M089), UWA Institute of Agriculture, Faculty of Science, The University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia;3. Sustainable Engineering Group, School of Civil and Mechanical Engineering, Curtin University, Bentley, Western Australia 6845, Australia;1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, 500 Dongchuan Road, Shanghai, 200241, China;2. Key Laboratory of Geographic Information Science of the Ministry of Education, College of Geographical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai, 200241, China;1. Key Laboratory of Coastal and Island Development of Ministry of Education, Nanjing University, 163 Xianlin avenue, Nanjing 210023, China;2. American University in Central Asia, Bishkek 720015, Kyrgyzstan;3. Yancheng National Nature Reserve for Wetland Rare Birds, Yancheng 224333,China |
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| Abstract: | Sieved soil and soil core experiments were performed to determine the potential sensitivity of forest soil CH4 oxidation to oxidised N, reduced N and oxidised S atmospheric deposition. Ammonium sulphate was used to simulate reduced N deposition, HNO3 oxidised N deposition and H2SO4 oxidised S deposition. The effects of NH4+, NO3−, SO42− and H+ on soil CH4 flux were shown to be governed by the associated counter-anion or cation of the investigated ions. Ammonium sulphate, at concentrations greater than those that would be experienced in polluted throughfall, showed a low potential to cause inhibition of CH4 oxidation. In contrast, HNO3 strongly inhibited net CH4 oxidation in sieved soils and also in soil cores. In addition, soil CO2 production was inhibited and the organic and mineral soil horizons acidified in HNO3 treated soil cores. This suggested that the HNO3 effect on CH4 flux might be indirectly mediated through aluminium toxicity. Sulphuric acid only inhibited CH4 oxidation when added at pH 1. At concentrations more representative of heavily polluted throughfall, H2SO4 had no effect on soil CH4 flux or CO2 production from soil cores, even after 210 days of repeated addition. In contrast to HNO3 additions, acidification of the soil was not marked and was only significant for the mineral soil. The findings suggest that the response of forest soil CH4 oxidation to atmospheric acid deposition is strongly dependent on the form of acid deposition. |
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