河口滨岸潮间带湿地碳埋藏和存贮的“蓝碳”效应，是应对全球大气层温室气体浓度升高和温室效应的热点话题，其中碳库来源辨析及其转化差异性机制是碳汇潜力和净碳汇容量研究的难题，尤其是在全球变化背景下，全球增温和海平面上升及其带来的海岸带环境变化对海岸带碳库容量和其净碳汇效应的影响还未系统探明。为此本研究拟选择其中最为重要的关键科学问题“河口湿地碳库中不同来源的有机碳比例和降解转化速率，及其对河口海岸带环境因子变化的响应”为研究目标，选择长江口典型潮间带湿地为研究区域，在长期野外观测、实验室模拟和端源判源模型分析基础上，开发和建立典型来源标志物有机碳单体分离和同位素分析技术，解决陆源和自生本地源有机碳的判源、定量和降解差异性难题，结合模拟长时间序列培养实验，揭示湿地有机碳固持和抗降解速率差异及其随环境因子变化机制，实现全球变化中河口滨岸地区碳源汇效应的精确评估和预测。

The carbon sequestrated and stored in the intertidal zone of wetlands and estuaries has been termed “blue carbon”, which can contribute to limiting the growth of GHGs emissions and to mitigating climate change. However, it’s still difficult to discriminate carbon sources and to understand their differential mechanism of degradation rate. In the context of global warming and sea level rising, it is prudent to improve scientific understanding of the impact of estuarine environmental changes on carbon sequestration capacity. The main objective of this study intends to investigate the ratio of organic carbon of different sources and its degradation rate response to environmental factors at intertidal estuarine wetland. Based on long-term field observation, laboratory simulation and source identifying model analysis in Yangtze River Delta, a technique via combining typical source marker extraction of organic carbon monomer and isotope analysis will be developed to solve the problem of identification and quantification of carbon sources. Combining with long-term incubation experiments, revealing the mechanism of heterogeneous degradation rate of organic carbon and its response to estuarine environmental changes lead to a more accurate estimation and prediction of estuarine “blue carbon” effect.