Fraction of CH4 oxidized in paddy field measured by stable carbon isotopes

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• 作者：Guangbin Zhang ; Wenxuan Zhang ; Haiyang Yu ; Jing Ma ; Hua Xu ; Kazuyuki Yagi
• 关键词：Stable carbon isotopes ; Paddy field ; CH4 oxidation ; CH4 production ; Rhizosphere ; Soil ; water interface
• 刊名：Plant and Soil
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：389
• 期：1-2
• 页码：349-359
• 全文大小：341 KB
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  17. Krüger, M, Frenz
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Sciences
  Soil Science and Conservation
  Plant Physiology
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-5036

文摘

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 10-0?%, 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 10-2 -lower than floodwater δ 13CH4, indicating that around 30-0?% 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 5-0?% 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.