作为全球重要的碳储存库，泥炭湿地及其与气候变化的关系一直是碳循环研究的难点和前沿领域。降水和氮沉降变化显著改变泥炭湿地碳过程，但是水氮耦合对高寒泥炭湿地土壤碳库稳定性的作用及其机理尚不清楚。本项目瞄准此国际前沿热点，以若尔盖高寒泥炭湿地为研究对象，采用稳定性碳氮同位素标记示踪和固态核磁共振波谱技术，基于野外原位实验和室内培养实验，阐明若尔盖高寒湿地植物-土壤系统碳动态对水氮耦合的响应；阐明水氮耦合对高寒湿地土壤碳固持潜力的影响；揭示水氮耦合对泥炭土碳排放的激发效应并探讨其机制；采用土壤碳的物理保护和化学结构等多指标量化评估水氮耦合对泥炭湿地土壤碳库稳定性的影响。研究结果将有助于深入认识气候变化下高寒泥炭湿地土壤碳固持与碳库稳定性，理论上可为高寒湿地生态系统碳循环模型的完善和发展提供依据，实践上可为气候变化下高寒湿地保护与管理以及湿地碳汇扩增和评估交易提供支持。

The effect of climate change on the stability of carbon pool is not clear although peatland is an important carbon pool in the world. The stability of carbon pool of Zoigê alpine peatland with water and nitrogen coupling with drying-rewetting cycles due to extreme climate change is studied. By using stable carbon isotope labeling and tracing and solid-state nuclear magnetic resonance spectroscopy technique in situ and in incubation experiment, we aim to explore the effect of drying-wetting cycles and nitrogen deposition on carbon dynamic of the plant - soil system, to confirm the effect of drying-wetting cycles and nitrogen deposition on carbon sequestration potentiality, to clarify the priming effect and its mechanism of drying-wetting cycles and nitrogen deposition on carbon emissions, to evaluate the stability of soil carbon pool with water and nitrogen coupling according to the physical protection and chemical structures of soil carbon. This study will help us understand the dynamic of carbon sequestration and stability in alpine peatland with global climate change. The results will provide the basis for the perfection and development of alpine wetlands ecosystem carbon model in theory, and provide the foundation for the assessment and trade of carbon sink with climate change and wetlands protection in practice.