caa a22 4500 606218033 CHVBK 20210128101110.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s11104-014-2365-5 doi (NATIONALLICENCE)springer-10.1007/s11104-014-2365-5 Fraction of CH4 oxidized in paddy field measured by stable carbon isotopes [Elektronische Daten] [Guangbin Zhang, Wenxuan Zhang, Haiyang Yu, Jing Ma, Hua Xu, Kazuyuki Yagi] Aims: Estimating the fraction of CH4 that is oxidized (F ox) in paddy field using the stable carbon isotope natural abundance (SCINA) method and discussing the availabilities of δ 13CH4 (original) (newly produced δ 13CH4) and δ 13CH4 (oxidized) (oxidized δ 13CH4) in the method. Methods: CH4 fluxes from a continuously flooded paddy field and via rice plants, CH4 concentrations in soil pore water and floodwater, CH4 production rates of soil slurries and rice roots, and their stable carbon isotopes (δ 13C) were measured during the rice growing season through field and incubation experiments. Results: The estimation of F ox in the rhizosphere was the most efficient by using anaerobically produced δ 13CH4 of the soil as δ 13CH4 (original) and δ 13CH4 emitted from the field minus transport fractionation factor (ε transport = −12.82 ‰) as δ 13CH4 (oxidized). So, rhizospheric F ox was measured to be about 10-60%, relatively high in the first half of the season. As porewater CH4 was potentially affected by CH4 oxidation and transport in field conditions, its δ 13CH4 poorly represented δ 13CH4 (original) or δ 13CH4 (oxidized). However, porewater δ 13CH4 was 10-22 ‰ lower than floodwater δ 13CH4, indicating that around 30-60% of the CH4 was oxidized at the soil-water interface when porewater CH4 released into the atmosphere. Anaerobically produced CH4 was highly 13C-depleted than aerobically produced CH4, F ox at the soil and root surfaces in lab conditions could be estimated when using the corresponding δ 13CH4 as δ 13CH4 (original) and δ 13CH4 (oxidized), and it was about 5-50% and almost 100%, respectively. Conclusions: The use of δ 13CH4 (original) and δ 13CH4 (oxidized) in estimating F ox in paddy field should be dependent on different CH4-oxidizing zones in different conditions. Springer International Publishing Switzerland, 2014 Stable carbon isotopes nationallicence Paddy field nationallicence CH4 oxidation nationallicence CH4 production nationallicence Rhizosphere nationallicence Soil-water interface nationallicence Zhang Guangbin State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 210008, Nanjing, China aut Zhang Wenxuan State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 210008, Nanjing, China aut Yu Haiyang State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 210008, Nanjing, China aut Ma Jing State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 210008, Nanjing, China aut Xu Hua State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 210008, Nanjing, China aut Yagi Kazuyuki National Institute of Agro-Environmental Sciences, 3-1-3 Kannondai, 305-8604, Tsukuba, Ibaraki, Japan aut Plant and Soil Springer International Publishing 389/1-2(2015-04-01), 349-359 0032-079X 389:1-2<349 2015 389 11104 https://doi.org/10.1007/s11104-014-2365-5 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11104-014-2365-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhang Guangbin State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 210008, Nanjing, China aut NATIONALLICENCE 700 1- Zhang Wenxuan State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 210008, Nanjing, China aut NATIONALLICENCE 700 1- Yu Haiyang State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 210008, Nanjing, China aut NATIONALLICENCE 700 1- Ma Jing State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 210008, Nanjing, China aut NATIONALLICENCE 700 1- Xu Hua State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 210008, Nanjing, China aut NATIONALLICENCE 700 1- Yagi Kazuyuki National Institute of Agro-Environmental Sciences, 3-1-3 Kannondai, 305-8604, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 773 0- Plant and Soil Springer International Publishing 389/1-2(2015-04-01), 349-359 0032-079X 389:1-2<349 2015 389 11104