The alpine meadow ecosystem on the Qinghai–Tibetan Plateau (QTP) is very sensitive to warming and plays a key role in regulating global carbon (C) cycling. However, how warming affects the soil organic carbon (SOC) pool and related C inputs and outputs in alpine meadow ecosystems on the QTP remains unclear. Here, we combined two field experiments and a meta-analysis on field experiments to synthesize the responses of the SOC pool and related C cycling processes to warming in alpine meadow ecosystems on the QTP. We found that the SOC content of surface soil (0–10 cm) showed a minor response to warming, but plant respiration was accelerated by warming. In addition, the warming effect on SOC was not correlated with experimental and environmental variables, such as the method, magnitude and duration of warming, initial SOC content, mean annual temperature, and mean annual precipitation. We conclude that the surface SOC content is resistant to climate warming in alpine meadow ecosystems on the QTP.

中文翻译：

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增温对青藏高原高寒草甸生态系统表层土壤有机碳的影响较小

青藏高原（QTP）的高寒草甸生态系统对变暖非常敏感，在调节全球碳（C）循环中发挥着关键作用。然而，变暖如何影响青藏高原高寒草甸生态系统中的土壤有机碳（SOC）库和相关的碳输入和输出仍不清楚。在这里，我们结合了两个田间实验和田间实验的荟萃分析，以综合 SOC 池和相关 C 循环过程对 QTP 高寒草甸生态系统变暖的响应。我们发现表层土壤 (0-10 cm) 的 SOC 含量对变暖的反应较小，但植物呼吸因变暖而加速。此外，变暖对 SOC 的影响与实验和环境变量无关，例如变暖的方法、幅度和持续时间、初始 SOC 含量、年平均气温和年平均降水量。我们得出结论，在青藏高原上的高寒草甸生态系统中，地表 SOC 含量对气候变暖具有抵抗力。