气候变化下若尔盖泥炭沼泽甲烷排放过程及微生物机制研究

泥炭沼泽作为甲烷重要源，它对大气甲烷的贡献率很大，产甲烷菌和甲烷氧化菌这两大类功能微生物在甲烷的产生和氧化过程中发挥着重要的作用。青藏高原高海拔低温环境孕育了广阔的泥炭沼泽，面积大、分布广，是我国面积最大分布最集中的泥炭沼泽区，碳储量丰富，其甲烷通量及相关研究受到极大关注。人类活动和气候变化不断加剧，导致了泥炭地的急剧退化，然而目前国内外对于不同退化泥炭地甲烷排放过程及微生物机理研究较缺乏。因此，本项目以青藏高原若尔盖泥炭地为研究对象，应用培养方法和分子生物学手段来研究未来气候变化背景下不同退化泥炭地甲烷产生和氧化过程及甲烷菌和甲烷氧化菌群落结构，探讨全球变化条件下泥炭沼泽甲烷排放过程及相关微生物如何响应和反馈环境的变化。

Peatlands is one of the important sources of methane. Methanogens and methanotrophs are the two important microbes controlling methane production and oxidation, repectively. Due to high altitude and cold environment on Qinghai-Tibetan Plateau, there exists great distribution of peatlands on the plateau. In recent years, there are an arising number of studies concerning about methane emissions and related microbial mechamisms of Tibetan pealands. Increasing human activities and climate change lead to substanitial degradation of peatlands. However, studies about methane emissions and microbial mechanism are still limited, even less is considering peatland degradation’s effect on them. Therefore, this proposal will choose Zoige peatlands as our study site, employ incubation methods as well as molecular biology to analyze methane production，oxidation and the community structure of methanogens and methanotrophs in different degraded peatlands and their reponse to climate change (warming+ rainfall reduction), aiming to understand methane emmissions and related microbes’ response to climate change in a peatland complex with different degraded peatlands.