Abstract: To explore the impacts of natural wildfires on soil organic carbon components， we selected high-altitude swamp wetlands to analyze changes in soil organic carbon components in the year of the fire， one year after the fire， and two years after the fire. The results showed that in the year of the fire， soil available phosphorus， soil organic carbon， total nitrogen， and total phosphorus significantly increased. One year after the fire， available phosphorus， pH， and total nitrogen significantly decreased. Two years after the fire， available phosphorus significantly decreased by 8.98%， while total phosphorus significantly increased by 34.04% （P<0.05）. In the year of the fire， soil organic carbon and easily oxidizable organic carbon significantly increased， while they significantly decreased one year after the fire. Two years after the fire， easily oxidizable organic carbon significantly increased by 5.76 g·kg^-1. In the year of the fire， total nitrogen and total phosphorus were key factors affecting soil organic carbon and its components. The increase in soil organic carbon and its active components in the year of the fire suggested a decrease in the stability of the soil organic carbon pool， but with time， the soil carbon pool tended to stabilize. The effects of natural wildfires on soil organic carbon components in high-altitude swamp wetlands provided a reference for post-fire management of these wetlands.

Key words: Alpine wetland, Wildfire, Soil physical and chemical properties, Organic carbon components

摘要： 为探讨自然野火对高寒湿地土壤有机碳组分的影响，本研究选取火烧当年、火烧一年和火烧两年的高寒沼泽湿地样地，进行了土壤有机碳组分特征变化分析。结果表明：火烧当年土壤速效磷、土壤有机碳、全氮和全磷显著升高；火烧一年后，速效磷、pH和全氮含量显著下降；火烧两年后，速效磷含量显著下降8.98%，全磷显著提高34.04%（P<0.05）。火烧当年，高寒沼泽湿地土壤有机碳、易氧化有机碳显著升高，火烧一年后显著下降，火烧两年后，易氧化有机碳显著上升5.76 g·kg^-1。火烧当年，全氮和全磷是影响土壤有机碳及其组分的关键因子。火烧当年土壤有机碳及其活性组分含量升高，火烧一年后和两年后呈现下降趋势，有机碳及其活性组分的升高表明土壤有机碳库的稳定性下降，但随时间的推移土壤碳库趋于稳定。研究自然野火对高寒沼泽湿地土壤有机碳组分的影响，可为高寒沼泽湿地的火后管护提供参考。

关键词: 高寒沼泽湿地, 自然野火, 土壤理化性质, 有机碳组分