Wetlands are important modulators of atmospheric greenhouse gas (GHGs) concentrations. However, little is known about the magnitudes and spatiotemporal patterns of GHGs fluxes in wetlands on the Qinghai-Tibetan Plateau (QTP), the world’s largest and highest plateau. In this study, we measured soil temperature and the fluxes of carbon dioxide (CO₂) and methane (CH₄) in an alpine wetland on the QTP from April 2017 to April 2019 by the static chamber method, and from January 2017 to December 2017 by the eddy covariance (EC) method. The CO₂ and CH₄ emission measurements from both methods showed different relationships to soil temperature at different timescales (annual and seasonal). Based on such relationship patterns and soil temperature data (1960–2017), we extrapolated the CO₂ and CH₄ emissions of study site for the past 57 years: the mean CO₂ emission rate was 1096.59 mg C m^–2 h^–1 on different measurement methods and timescales, with the range of the mean emission rate from 421.17 to 1754.99 mg C m^–2 h^–1, while the mean CH₄ emission rate was 32.99 mg C m^–2 h^–1, with the ranges of the mean emission rate from 16.95 to 46.25 mg C m^–2 h^–1. The estimated regional CO₂ and CH₄ emissions from permanent wetlands on the QTP were 94.29 and 2.37 Tg C year^–1, respectively. These results indicate that uncertainties caused by measuring method and timescale should be fully considered when extrapolating wetland GHGs fluxes from local sites to the regional level. Moreover, the results of global warming potential showed that CO₂ dominates the GHG balance of wetlands on the QTP.

湿地是大气温室气体（GHGs）浓度的重要调节剂。然而，人们对世界上最大和最高的高原青藏高原（QTP）湿地中温室气体通量的大小和时空分布知之甚少。在这项研究中，我们通过静态室法以及2017年1月至2017年12月在QTP上测量了2017年4月至2019年4月高寒湿地的土壤温度以及二氧化碳（CO ₂）和甲烷（CH ₄）的通量。通过涡动协方差（EC）方法 CO ₂和CH ₄两种方法的排放测量结果显示在不同的时间尺度（年度和季节）与土壤温度的关系不同。基于这种关系模式和土壤温度数据（1960–2017），我们推断了过去57年的研究地点的CO ₂和CH ₄排放：平均CO ₂排放速率为1096.59 mg C m ^–2 h ^–1。不同的测量方法和时标，平均发射率范围为421.17至1754.99 mg C m ^–2 h ^–1，而平均CH ₄发射率为32.99 mg C m ^–2 h ^–1，平均发射率范围为16.95至46.25 mg C m ^–2 h ^–1。QTP上永久性湿地的估计区域CO ₂和CH ₄排放量– ¹年分别为94.29和2.37 TgC 。这些结果表明，在将湿地温室气体通量从当地推算到区域水平时，应充分考虑由测量方法和时间尺度引起的不确定性。此外，全球变暖潜力的结果表明，CO ₂主导了QTP湿地的温室气体平衡。