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Sedimentary records of eutrophication in the Changjiang Estuary upwelling area over last 100 a
作者姓名:FENG Xuwen  JING Xianglong  YU Xiaoguo  LI Hongliang  CHEN Jianfang  QIAN Jiangchu
作者单位:FENG Xuwen(Geology Science Department,Zhejiang University,Hangzhou 310027,China;Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China);JING Xianglong,YU Xiaoguo,QIAN Jiangchu(Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China;Laboratory of Submarine Geoscieuces of State Oceanic Administration,Second Institute Oceanography,State Oceanic Administration,Hangzhou 310012,China);LI Hongliang,CHEN Jianfang(Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China;Laboratory of Marine Ecosystem and Biogeochemistry of State Oceanic Administration,Second Institute Oceanography,State Oceanic Administration,Hangzhou 310012,China) 
基金项目:The Zhejiang Provincial Science Foundation of China,the Youth Natural Science Foundation of State Oceanic Administration of China,Chinese Offshore Investigation and Assessment 
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 in- creased to some extent since the 1970s. TOC and TN fluxes increased about 45%, 36% respectively. The average δ13 Coorg 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 Cors 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
收稿时间:6/4/2008 12:00:00 AM
修稿时间:2008/10/9 0:00:00

Sedimentary records of eutrophication in the Changjiang Estuary upwelling area over last 100 a
FENG Xuwen,JING Xianglong,YU Xiaoguo,LI Hongliang,CHEN Jianfang,QIAN Jiangchu.Sedimentary records of eutrophication in the Changjiang Estuary upwelling area over last 100 a[J].Acta Oceanologica Sinica,2008,27(6):49-61.
Authors:FENG Xuwen  JING Xianglong  YU Xiaoguo  LI Hongliang  CHEN Jianfang and QIAN Jiangchu
Affiliation:1. Geology Science Department,Zhejiang University,Hangzhou 310027,China;Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China
2. Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China;Laboratory of Submarine Geoscieuces of State Oceanic Administration,Second Institute Oceanography,State Oceanic Administration,Hangzhou 310012,China
3. Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China;Laboratory of Marine Ecosystem and Biogeochemistry of State Oceanic Administration,Second Institute Oceanography,State Oceanic Administration,Hangzhou 310012,China
Abstract:The upwelling area in the Changjiang Estuary was selected to collect the core,where the red tide occurred frequently and hypoxic exis-ted.The total organic carbon (TOC),total nitrogen (TN),biogenic silica (BSi) and stable organic carbon isotopic ratios(813 Corg) were determined on the 210Pb-dated sediment core.The concentrations of TOC,TN,BSi as well as their sedimentation fluxes have in-creased 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 terrige-nous and marine organic matter inputs for the sediment,which indicated the increase in accmnulation 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 hy-pothesis that anthropogenie nutrient loading has been a significant factor on the eutrophication in the Changjiang Estuary.
Keywords:Changjiang Estuary  total organic carbon  total nitrogen  biogenie silica  stable carbon isotopes  eutrophication
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