Abstract. An experiment was conducted to investigate the effect of seasonally asymmetric warming on CO₂, CH₄, and N₂O fluxes in alpine grassland of Tianshan Mountains of Central Asia, from October 2016 to September 2019. Our results indicated that the CO₂, CH₄ and N₂O fluxes varied in the range 0.56–98.03 mg C m⁻² h⁻¹, −94.30–0.23 μg C m⁻² h⁻¹, and −1.28–10.09 μg N m⁻² h⁻¹, respectively. The CO₂ and N₂O fluxes were negatively correlated with soil temperature, but the CH₄ fluxes decreased with the increase in temperature. Furthermore, the variation in greenhouse gas flux under seasonally asymmetric warming was different between the growing season (June to September) and the non-growing season (October to May). In addition, the response rates of CO₂ and N₂O fluxes to temperature increases was significantly reduced due to warming throughout the year. Warming during the growing season led to a significant decrease in the response rate of CO₂ flux to temperature increases. However, warming during the non-growing season caused a significant increase in the response rate of CO₂ flux to temperature increases. The response rate of CH₄ flux was insensitive to temperature increase under seasonally asymmetric warming. Thus, the main finding of our results was that seasonally asymmetric warming resulted in different responses in the fluxes of individual greenhouse gases to rising temperatures in the alpine grassland.

中文翻译：

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天山高寒草地CO ₂，CH ₄和N ₂ O通量对季节性非对称变暖的不同响应

摘要。进行了一项实验，研究了2016年10月至2019年9月季节不对称升温对中亚天山高寒草原CO ₂，CH ₄和N ₂ O通量的影响。我们的结果表明，CO ₂，CH ₄个N _2个ö通量毫克0.56-98.03 C M中的范围内变化^-2  ħ ^-1，-94.30-0.23微克C M ^-2  ħ ^-1，-1.28-10.09和微克n×m个^-2  ħ ^-1，分别。CO ₂和N ₂O通量与土壤温度呈负相关，但CH ₄通量随温度升高而降低。此外，在季节非对称变暖下，温室气体通量的变化在生长季节（6月至9月）和非生长季节（10月至5月）之间是不同的。另外，由于全年变暖，CO ₂和N ₂ O通量对温度升高的响应率显着降低。生长季节的变暖导致CO ₂通量对温度升高的响应速率显着下降。然而，在非生长季节的变暖导致CO ₂的响应率显着提高。温度的通量增加。在季节性非对称变暖条件下，CH ₄流量的响应速率对温度升高不敏感。因此，我们研究结果的主要发现是季节性不对称变暖导致高寒草地中个别温室气体通量对温度升高的响应不同。