Sources and dynamics of sedimentary organic matter in Sundarban mangrove estuary from Indo-Gangetic delta

作     者：M.Bala Krishna Prasad Alok Kumar A.L.Ramanathan Dilip Kumar Datta 

作者机构：22616 Shining Harness StreetClarksburgMD 20871USA School of Environmental SciencesJawaharlal Nehru UniversityNew Delhi 110067India Environmental Science DisciplineKhulna UniversityKhulna 9208Bangladesh 

出 版 物：《Ecological Processes》 (生态过程（英文）)

年 卷 期：2017年第6卷第1期

页      面：69-83页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：Asia-Pacific Network for Global Change Research  APN 

主　　题：Sundarban mangrove Organic carbon Stable isotopes Lignin phenols Three end-member mixing model 

摘      要：Introduction:Mangrove forests are highly productive ecosystems distributed along the tropical coast *** biogeochemistry of mangroves are primarly driven by both allochthonous and autochthonous *** of organic matter in coastal ecosystems enables to understand the biogeochemical transformation of organic matter and its influence on ecosystem productivity in response to various changing environmental ***,the elemental and stable carbon and nitrogen levels were employed to understand the organic matter(OM)dynamics in the Sundarban mangrove ecosystem(India-Bangladesh).Results:Differences in stable isotope values indicate that variable sources influence the OM dynamics in Sundarban *** progressive enrichment inδ13C levels along the land-coastal continuum indicates that the terrestrial and marine inputs are dominant at the landward and seaward ends,*** CuO oxidationderived lignin phenol monomers describe significant levels of total lignin are preserved in Sundarban mangrove sediments during *** phenol monomer ratios are lower than the plant litter explaining that aromatic ring cleavage is the dominant mechanism for the lignin ***,the Ad/Al ratios were higher than the plant litter explaining the oxidation of propyl side chain of vascular OM influencing the carbon cycling in Sundarban ***,the Ad/Al ratios describe the vascular OM degradation is through the oxidation of propyl side ***:The regional variability in land-use regulates the spatial variability in C,N,OC/TN ratio,δ13C andδ15N between the Indian and the Bangladesh Sundarban mangroves and indicates that in the upstream terrestrial organic matter and/or mangrove plant litter contribute significant amount of organic matter,whereas the marine POC influences the organic matter dynamics in *** three end-member mixing model applying terrestrial plant litter,seston,and marine POC as e