Chemical and spectroscopic characterization of dissolved humic substances in a mangrove-fringed estuary in the eastern coast of Hainan Island,China

作     者：张耀玲 杜金洲 彭浡 张芬芬 赵欣 张经 

作者机构：State Key Laboratory of Estuarine and Coastal ResearchEast China Normal University Department of PhysicsEast China Normal University 

出 版 物：《Chinese Journal of Oceanology and Limnology》 (中国海洋湖沼学报（英文版）)

年 卷 期：2013年第31卷第2期

页      面：454-463页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 

基　　金：Supported by the National Natural Science Foundation of China(Nos.40906041,41021064) the State Key Laboratory of Estuarine and Coastal Research (SKLEC) of East China Normal University(Nos.2012KYYW05,201202) 

主　　题：mangrove fulvic acid humic acid XAD-4 fraction FTIR NMR 

摘      要：Mangrove-derived dissolved organic matter （DOM） has an important effect on estuarine and coastal area on a large scale. In order to improve the understanding of origin, composition, and fate of DOM in mangrove-fringed estuarine and coastal areas, dissolved humic substances （DHS） were isolated from one mangrove pore-water sample and one near-shore seawater sample downstream the mangrove pore-water site in the eastern coast of Hainan Island, South China. Fulvic acids, humic acids and XAD-4 fractions were obtained from the two water samples by using a two-column array of XAD-g and XAD-4 resins. Chemica~ and spectroscopic methods were used to analyze the features of these DHS. Compared to the mangrove pore-water DHS, the near-shore seawater DHS were found rich in 13C with lower C/N ratios and more aliphatic compounds and carbohydrates, but less aromatic structures and carboxyl groups. As for the three fractions of the two DHS, XAD-4 fractions contain more aliphatics, carbohydrates, carboxyl groups, and enrich in 13C with respect to both fulvic and humic acids. Photo-oxidation transformation and contribution from marine-derived DOM were considered as the main reasons resulted in the difference in compositional features for these DHS in this study.