Sedimentary records of eutrophication in the Changjiang Estuary upwelling area over last 100 a

查看全文 作　　者：FENG [1,2]Xuwen;JING [2,3]Xianglong;YU [2,3]Xiaoguo;LI [2,4]Hongliang;CHEN [2,4]Jianfang;QIAN [2,3]Jiangchu

机构地区：[1]Geology Science Department, Zhejiang University, Hangzhou 310027, China;[2]Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;[3]Laboratory of Submarine Geosciences of State Oceanic Administration, Second Institute Oceanography, State Oceanic Adminis-tration, Hangzhou 310012, China;[4]Laboratory of Marine Ecosystem and Biogeochemistry of State Oceanic Administration, Second Institute Oceanography, StateOceanic Administration, Hangzhou 310012, China

出　　处：《Acta Oceanologica Sinica》索引2008年第27卷第6期,共13页

基　　金：The Zhejiang Provincial Science Foundation of China under contract No.Y506287;the Youth Natural Science Foundation of State Oceanic Administration of China under contract No.200231;Chinese Offshore Investigation and Assessment under contract Nos 908-01-ST04 and 908 -02-02-05 摘　　要：The upwelling area in the Changjiang Estuary was selected to collect the core, where the red tide occurred frequently and hypoxic existed. The total organic carbon (TOC), total nitrogen (TN), biogenic silica (BSi) and stable organic carbon isotopic ratios(δ13 Corg) were determined on the 210Pb-dated sediment core. The concentrations of TOC, TN, BSi as well as their sedimentation fluxes have increased to some extent since the 1970s. TOC and TN fluxes increased about 45%, 36% respectively. The average δ13 Corg value in the core was -23.67×10-3 which remained nearly constant before the 20 century. The δ13 Corg values increased after the 1900s, two marked increases were observed from the 1950s and the 1970s. A simple δ13 Corg model was used to estimate the contribution of terrigenous and marine organic matter inputs for the sediment, which indicated the increase in accumulation since the 1970s has been almost exclusively marine. The increasing of marine organic matter accumulation (TOC, TN and BSi) was corresponding with the increasing of fertilizer consumption and the NO3-N budgets from the Changjiang River. The riverine runoff of fertilizers and nutrients stimulated the algae blooming. Enhanced primary production resulted in an enrichment of organic matter in the sediment. These data support the hypothesis that anthropogenic nutrient loading has been a significant factor on the eutrophication in the Changjiang Estuary. 关键词：水体富营养化上升流区长江口沉积记录面积比英国标准协会总有机碳沉积通量

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Sedimentary records of eutrophication in the Changjiang Estuary upwelling area over last 100 a

参考文献(39)

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耦合文献(767)

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