Variations of methane stable isotopic values from an Alpine peatland on the eastern Qinghai-Tibetan Plateau
Variations of methane stable isotopic values from an Alpine peatland on the eastern Qinghai-Tibetan Plateau
复制标题
青藏高原东部高山泥炭地甲烷稳定同位素值变化
DOI：
10.1007/s11631-021-00477-z
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发表时间：
2021-06
期刊：
影响因子：
1.6
通讯作者：
Yetang Hong
中科院分区：
文献类型：
--
作者：
Qian Guo;Haijun Peng;Bing Hong;Hu Yao;Yongxuan Zhu;Hanwei Ding;Ning An;Yetang Hong
同位素特征是区分甲烷（CH4）来源类型和限制区域和全球尺度CH4收支的有力工具。利用基林图技术测定了ch4浓度及其稳定碳同位素δ13C-CH4，得出了ch4源的碳同位素特征。ch4浓度和δ 13c - ch4的日变化特征为夏季δ 13c - ch4信号减弱，夜间ch4浓度升高。夏季δ 13c - ch4值为- 71%±1.3%，符合其他湿地研究的范围，接近高纬度泥炭地。边界层动力学和ch4源对测量的ch4浓度和δ13C-CH4均有影响。非生长期的ch4同位素信号仍需要进一步研究，以约束该地区的δ 13c - ch4特征及其环境控制因素。
Isotopic signature is a powerful tool to discriminate methane (CH4) source types and constrain regional and global scale CH4budgets. Peatlands on the Qinghai-Tibetan Plateau are poorly understood about the isotopic signature of CH4due to the limited experimental conditions. In this study, three campaigns of diurnal air samples spacing 2–3 h were taken from an alpine peatland on the eastern Qinghai-Tibetan Plateau to investigate its source signal characteristics. Both CH4concentration and its stable carbon isotope (δ13C-CH4) were measured to derive the carbon isotopic signature of the CH4source using the Keeling plot technique. Diurnal variation patterns in CH4concentration and δ13C-CH4were observed during summertime, with depleted δ13C-CH4signals and high CH4concentration appearing at nighttime. The δ13C-CH4signature during summer was calculated to be −71% ± 1.3%, which falls within the range of other wetland studies and close to high-latitude peatlands. The boundary layer dynamic and CH4source were supposed to influence the measured CH4concentration and δ13C-CH4. Further investigations of CH4isotopic signals into the non-growing season are still needed to constrain the δ13C-CH4signature and its environmental controls in this region.
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