Changes in freeze–thaw processes as a result of climate change significantly affect the carbon balance of terrestrial ecosystems, especially peatlands. The Qinghai-Tibetan Plateau contains substantial permafrost and seasonal frozen soils and its peatlands feature a huge carbon stock highly sensitive to global change. In this paper, we used an eddy covariance flux tower to monitor carbon fluxes on the Zoige peatlands with seasonal frozen soils on the eastern Qinghai-Tibetan Plateau from 2013 to 2017. Total net emissions (g C m⁻² yr⁻¹) over the monitoring period were 64.1, 106.7, 126.5 and 103.2 in the frozen, frozen-thawing, thawing and thawing-freezing periods; the corresponding weighted mean emission rates (g C m⁻² d⁻¹) were 0.36, 0.44, 0.64 and 0.38. Although net CO₂ emissions were highest in the thawing period, emissions during the other periods accounted for approximately 68.4% of annual emissions. In fact, emissions during the two freeze–thaw periods were 1.7 times those during the thawing period despite the freeze–thaw periods lasting fewer days. CO₂ emission correlated significantly with volumetric water content and soil temperature in the frozen period, with soil temperature and precipitation in the frozen-thawing period, and with precipitation in the thawing and thawing-freezing periods. Annual net CO₂ emissions during each of the years were 57.2 g C m⁻² yr⁻¹ (2013), 108.3 g C m⁻² yr⁻¹ (2014), 41 g C m⁻² yr⁻¹ (2015), 62.9 g C m⁻² yr⁻¹ (2016) and 131.1 g C m⁻² yr⁻¹ (2017), and hydrological conditions were the primary determinant of interannual variations. Long-term continuous monitoring of carbon is essential to understand how freeze–thaw processes affect the ability of alpine peatland ecosystems to act as carbon sources and sinks.

气候变化导致冻融过程的变化显着影响陆地生态系统的碳平衡，尤其是泥炭地。青藏高原包含大量多年冻土和季节性冻土，其泥炭地具有对全球变化高度敏感的巨大碳储量。在本文中，我们使用涡流协方差通量塔监测 2013 年至 2017 年青藏高原东部季节性冻土若尔盖泥炭地的碳通量。 总净排放量（g C m ^-2 yr ^-1）冷冻期、冻融期、解冻期和解冻期监测期分别为64.1、106.7、126.5和103.2；相应的加权平均排放率 (g C m ^-2 d ^-1) 分别为 0.36、0.44、0.64 和 0.38。尽管解冻期的净 CO ₂排放量最高，但其他时期的排放量约占年度排放量的 68.4%。事实上，尽管冻融期持续的天数较少，但两次冻融期的排放量是解冻期的 1.7 倍。CO ₂排放与冻结期的体积含水量和土壤温度显着相关，冻融期与土壤温度和降水相关，解冻期和融冻期与降水相关。每年净 CO ₂排放量为 57.2 g C m ^-2 yr ^-1 (2013), 108.3 g C m ^-2 yr^-1 (2014)、41 g C m ^-2 yr ^-1 (2015)、62.9 g C m ^-2 yr ^-1 (2016) 和 131.1 g C m ^-2 yr ^-1 (2017)，水文条件是年际变化的主要决定因素。长期连续监测碳对于了解冻融过程如何影响高山泥炭地生态系统作为碳源和碳汇的能力至关重要。