目前，对青藏高原地区的高寒泥炭地CH4排放行为的研究仍然较少，且国内目前没有对这些泥炭地CH4的稳定碳同位素组成（δ13C-CH4）特征进行过相关观测研究。加强对这些泥炭地δ13C-CH4的观测研究，既能揭示高寒泥炭湿地δ13C-CH4的动态变化特征，为我国泥炭湿地CH4排放清单的编制提供基础数据；又能丰富观测研究手段，为今后将这一技术应用于我国其它泥炭湿地CH4排放的研究中积累经验。因此，本申请项目拟在若尔盖地区的红原泥炭地开展对泥炭湿地排放的CH4，地下水、地表水、毛细水CH4以及混合大气CH4的稳定碳同位素组成进行观测研究，以揭示青藏高原高寒泥炭地δ13C-CH4的时间异质性，并进一步研究高寒湿地CH4在产生、运移和与大气混合和过程中的碳同位素分馏特征。本申请项目将能为高寒泥炭湿地的CH4排放研究提供新的方法，并能为准确的CH4排放量估算提供重要基础数据。

At present, little is known about CH4 emissions from the alpine peatlands on the eastern Qinghai-Tibetan Plateau (QTP), and CH4 carbon isotope (δ13C-CH4) measurements were urgently needed in this region. By enhancing field monitoring the δ13C-CH4 of these peatlands, we can not only reveal the controlling factors on CH4 from alpine peatlands, and provide a clear CH4 emission inventory of the QTP; but also enrich the means of observation and research, and lay a foundation for applying this technique to the studies of CH4 emission from other peatlands in China. The present application will carry out observation studies on the stable carbon isotopic composition of ground water, pore water, surface water, newly emitted, and discharged atmospheric CH4, to reveal the temporal heterogeneity of the δ13C-CH4 in alpine peatlands on the QTP, and to explore the characteristics of stable carbon isotope fractionation during the processes of CH4 production, transportation and mixing with the atmospheric air. This application will provide not only a new view for the alpine peatland CH4 emission study but also important fundamental data for evaluating the global CH4 budget.