全球气候变化中的滩涂湿地土壤有机碳研究

湿地生态系统的碳循环正在成为全球变化与陆地生态系统碳循环研究中的一大热点。湿地在稳定全球气候变化中占有重要地位，其重要性主要表现在湿地土壤是陆地上重要的有机碳库；土壤碳密度高；能够相对长期地储存碳，湿地是多种温室气体的源和汇。全球沿海湿地的分布面积大约为20．3万km^2，碳的积累速度为C（210±20）g／m^2·年，要远远高于泥炭湿地；并且沿海湿地大量存在的SO。。离子阻碍了甲烷的产生量，从而降低了甲烷的排放量。高的碳积累速率和低的甲烷排放量使沿海湿地对大气温室效应的抑制作用更加明显。盐城沿海滩涂芦苇沼泽地虽已列入世界重点湿地名录，但其有机碳循环及其分布特点尚未有资料报道。通过研究沿海滩涂湿地土壤有机碳储存变化及其空间分布规律，从微团聚体水平的有机碳转化与结合机制上研究土壤对有机碳的固定机制，对于了解湿地土壤有机碳的储存特点及其与陆地生态系统碳循环的关系，为评价和保护湿地生态系统提供依据具有重要的科学意义。

Global Climate Change and Research of Soil Organic Carbon in Coastal Wetland

Global climate cycle and carbon balance are one of the cores of current research in climate change and regional sustainable development, also one of the topics in a series of large - scale international cooperation in scientific research. One of the highlights in global change and terrestrial ecosystem research is on carbon cycle in wetland ecosystem. Wetland soil is the source and sink of various green gas and important pool of organic carbon with high carbon density and long - term of storage. The distribution area of global coastal wetland is approximately 203 × 10^3 km^2, and the accumulation rate of carbon in coastal wetland is 210±20g C · m ^-2 · a^-1 which is much higher than peat wetlands. Methane＇s emission is also inhibited due to the large amount of SO4^2- ions in coastal wetland soil. Hence, it＇s more obvious of the inhibition effect on green gas emission in coastal wetland. Although Yancheng coastal wetland is induced in the list of world key wetlands of international importance, the characterization of organic cycle and distribution of soil organic carbon are still no reports. It＇s essential for us to study on the changes of organic carbon storage in wetland soil and it＇s distribution in soil profiles, it＇s also important for us to understand the relationship between carbon storage and carbon cycle in terrestrial ecosystem, and to provide scientific basis for evaluation and protection coastal wetland ecosystem.