湿地是陆地生态系统的重要碳库，约占全球陆地生态系统碳库的10%，在CO2和CH4等温室气体的固定和释放中起着重要的"开关"作用。土壤有机碳活性组分和结构是评价土壤碳储存与释放的重要参数。微生物群落是土壤中最具活力的部分，是生态系统土壤碳循环的"转换机"，与地上植被和地下环境相互作用、互为因果，共同承载着湿地生态系统碳元素的平衡。本项目拟选择鄱阳湖南矶山自然保护区为试验点，分析湿地演替过程中土壤有机碳、植被和土壤有机碳的化学结构和活性组分、土壤微生物特征研究，探讨土壤有机碳组分和结构、植被、土壤微生物之间的相关性，揭示鄱阳湖流域湿地演替过程中土壤有机碳的变化及其稳定机制，为了解鄱阳湖湿地土壤碳循环，优化鄱阳湖湿地的生态，应对过量碳排放导致的气候变暖问题提供理论指导和决策依据。

Wetland, as an important carbon pool, containing 10 percent of the total C in the global terrestrial ecosystem, plays a key role of "switcher" in holding and releasing of greenhouse gases, such as CO2 and CH4. Content of soil organic carbon and its composition and structure are important parameters for evaluating soil carbon storage or release,and also microbial community is the most active part in soils, and plays the 'biological pump' of soil carbon cycle in ecosystem, and keeps the balance of carbon in the wetland ecosystem by linking the aboveground (plant communities) and underground (soil environment). Nanjishan Nature Reserve site of Poyang Lake was selected for this project, and variation of soil organic C,the composition and structure of soil oarganic C in soil and plant, and soil microbial characters were carried out under the succession process of typical wetland in Poyang Lake. By analyzing correlation between soil organic C, structure and the active component of soil organic C in soil and plant, plant community biomass, soil microbial structural diversity, and carbon sequestration microbial functional group at the wetland, variation of soil organic carbon and its stabilization mechanism at the wetland would be revealed. Theoretical guidance would be supplied for further understanding soil carbon cycle, for optimizing ecology of wetland, even for making a basic decision to response the climate warming caused by excessive carbon emissions in the Poyang Lake.