全新世气候变幅及变率是全球变化研究热点。了解脆弱生态系统应对气候变化方式能有效预测未来环境变化产生的高风险。作为地球重要碳库，泥炭地与外界大气相互作用密切，独特的生境使其对外界环境变化异常敏感。水文条件和pH是泥炭地景观格局塑造过程中最关键的环境因子，重建泥炭地古水位和pH有助于理解全球变化背景下泥炭地生态响应过程。摇蚊对环境变化响应敏感，已被广泛用于湖泊历史环境重建，但在泥炭地鲜见报道。本项目拟选择长江中游大九湖和七姊妹山两处亚高山泥炭地，通过泥炭表层摇蚊和环境因子现代过程分析，建立摇蚊-水位和摇蚊-pH转换函数，利用岩芯摇蚊亚化石定量重建全新世以来两处泥炭地古水位和pH，探明东亚夏季风控制下泥炭地全新世环境演化历史。本项目将为泥炭地古环境研究提供新的代用指标，揭示东亚季风区亚高山泥炭地全新世环境演化轨迹，推进区域泥炭地关键带应对全球气候变化的响应模式研究。

Understanding the timing, magnitude and rate of Holocene climate change remains a research priority. Knowledge of the response of fragile ecosystems to past climate change can enable us to model the risks to ecosystems of future environmental change. As an important carbon sink, peatlands interact closely with atmospheric changes and their unique habitat makes them extremely sensitive to environmental changes. The most important environmental factors in shaping peatland structures are hydrological state and pH, and reconstructing these parameters can enable us to understand the ecological responses of peatland to global changes. Chironomids are sensitive to environmental change, and have been widely used in the reconstruction of lacustrine paleoenvironments, but are rarely used in peatlands. In this project, two typical subalpine peatlands in the middle reaches of the Yangtze River, Dajiuhu Peatland and Qizimishan Peatland, are selected. Relationships between chironomids and environmental factors will be monitored, and transfer functions of chironomid-water table and chironomid-pH will be established. Subfossil chironomids in peat cores will be extracted and used to quantitatively reconstruct the Holocene palaeo-water table and pH, and to infer environmental changes in these two peatlands which are under the influence of East Asian summer monsoon. This project will provide a new proxy for studying palaeoenvironmental change in peatlands, and reveal the trajectories of Holocene peatland development in the East Asian monsoon region. The research will further enhance our understanding of Chinese subalpine peatland response to global climate change.