摘要
通过对白茆沙、扁担沙、中央沙、九段沙和崇明岛等长江口南支湿地表层沉积物有机碳含量的测定,研究河口岛屿沙洲湿地陆向发育过程中表层沉积物有机碳变化。结果得出:长江口南支岛屿沙洲湿地陆向发育过程中,表层沉积物有机碳含量逐步增加。处在发育前期的岛屿沙洲湿地,表层沉积物有机碳含量低,如白茆沙仅1.057%,随着岛屿沙洲的发育,表层沉积物有机碳含量逐渐升高,如发育较为成熟的崇明东滩湿地达3.176%;另外,从高程较低的光滩到发育较为成熟的芦苇带,表层沉积物有机碳含量也逐渐增加,其中芦苇带的含量最高(3.004%),海三棱藨草带次之(1.812%),光滩较低(1.436%);再者,随着岛屿沙洲湿地的陆向发育,其表层沉积物有机碳分布越来越不均匀,也说明了岛屿沙洲陆向发育过程中表层沉积物有机碳含量的变化趋势。这表明河口岛屿沙洲湿地陆向演变过程中,表层沉积物发挥着积极的有机碳汇聚功能。
The Yangtze River estuary is one of the largest estuaries in the world.Baimaosha,Biandansha,Zhongyangsha,Jiuduansha and Chongming island have been formed by rapid sedimentation in different stages of the estuary development.As sedimentation has progressed,there are associated changes in organic carbon content in the surface sediments.Few previous research has been completed on organic carbon concentrations in surface sediments of the estuary islands in relation to the growth of the island wetlands.This research investigated the concentrations of organic carbon within surface sediments of the wetland island progressing to land.Results showed that the carbon content in the surface sediments increased when the island wetlands progressed to land.The most recent formed wetland island had a low organic carbon content,such as Baimaosha,1.057%;with the development of the island wetlands to land,the organic carbon content increased gradually,such as the sediments in east beach of Chongming island,had a concentration of 3.176%.In addition,the organic carbon content increased gradually with the increase in altitude.The highest concentrations were in the reed zone,3.004%;the lowest were in bare beach region,1.436%;the concentrations of Scirpus mariqueter zone were between them,1.812%.However,the organic carbon content became uneven when the island wetlands was developing to land,which also explained the changing law of the organic carbon content in the surface layer of the island wetlands development.The study indicates that the island wetlands in estuary play an important role in storing organic carbon when processing to land.
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2011年第6期685-689,共5页
Resources and Environment in the Yangtze Basin
基金
暨南大学青年基金(51208026)
关键词
长江口
湿地
沉积物
有机碳
含量
Changjiang estuary
wetland
sediment
organic carbon
content
