Previous in situ warming experiments have predominantly employed open-top chamber and infrared radiation for aboveground warming， which fail to adequately simulate the warming process in deeper soil （>30 cm）. In contrast， the whole-ecosystem warming， warming both aboveground vegetation and soil profile， represents the most realistic field-scale warming method. Peatland ecosystems are the terrestrial ecosystems with the highest organic carbon density per unit area globally. However， how their carbon sequestration function respond under climate warming remains inconclusive. This study focused on the Zoige alpine peatlands in Hongyuan County， Sichuan Province， China. A field experiment was established with four warming treatments， including control （CK）， above-ground warming （AW）， whole-soil profile warming （BW） and whole-ecosystem warming （EW）. This research analyzed the effects of different warming treatments on ecosystem carbon fluxes in the peatland ecosystem and the regulatory mechanisms. The results showed that elevating soil temperature and decreasing soil profile moisture content were key regulators of ecosystem carbon fluxes. BW and EW all promoted ecosystem respiration （ER）， while AW had no significant effect on ER. EW significantly reduced both soil profile water content and promoted soil evaporation， leading to a notable decrease in net ecosystem productivity （NEP）. Although EW stimulated plant growth and increased carbon inputs， the enhanced respiration effect outweighed the warming-induced stimulation of photosynthesis， resulting in a significant weakened carbon sink. This study provides a scientific basis for accurately assessing the carbon sequestration function of alpine peatlands under climate warming.

Ecosystem carbon fluxes  /  Alpine peatlands  /  Climate warming  /  Whole-ecosystem warming