Sediment transport and carbon sequestration characteristics along mangrove fringed coasts

作     者：TU Qiang YANG Shengyun ZHOU Qiulin YANG Juan 

作者机构：College of Ocean and Earth Science Xiamen University Third Institute of OceanographyState Oceanic Administration School of Marine Science China University of Geosciences 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2015年第34卷第2期

页      面：21-26页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 

基　　金：The National Natural Science Foundation of China under contract Nos 41006051 and 41106108 the Scientific Research Foundation for Returned Scholars of the Ministry of Education of China the Fundamental Research Funds for the Central Universities under contract No.2652012032 the State Key Laboratory of Earth Surface Processes and Resource Ecology under contract No.257-2013-KF-13 

主　　题：mangroves grain size distribution sedimentary organic carbon Leizhou Peninsula 

摘      要：Mangroves play an important role in sequestering carbon and trapping sediments. However, the effectiveness of such functions is unclear due to the restriction of knowledge on the sedimentation process across the vegetation boundaries. To detect the effects of mangrove forests on sediment transportation and organic carbon sequestration, the granulometric and organic carbon characteristics of mangrove sediments were investigated from three vegetation zones of four typical mangrove habitats on the Leizhou Peninsula coast. Based on our results, sediment transport was often ＂environmentally sensitive＂ to the vegetation friction. A transition of the sediment transport mode from the mudflat zone to the interior/fringe zone was often detected from the cumulative frequency curve. The vegetation cover also assists the trapping of material, resulting in a significantly higher concentration of organic carbon in the interior surface sediments. However, the graphic parameters of core sediments reflected a highly temporal variability due to the sedimentation process at different locations. The sediment texture ranges widely from sand to mud, although the sedimentary environments are restricted within the same energy level along the fluvial-marine transition zone. Based on the PCA results, the large variation was mainly attributed to either the mean grain size features or the organic carbon features. A high correlation between the depth and δ13C value also indicated an increasing storage of mangrove-derived organic carbon with time.