| FENG Xuwen,JING Xianglong,YU Xiaoguo,LI Hongliang,CHEN Jianfang,QIAN Jiangchu. 2008. Sedimentary records of eutrophication in the Changjiang Estuary upwelling area over last 100 a. Acta Oceanologica Sinica, (6):49－61 |
| Sedimentary records of eutrophication in the Changjiang Estuary upwelling area over last 100 a |
| Sedimentary records of eutrophication in the Changjiang Estuary upwelling area over last 100 a |
| Received:June 04, 2008 Revised:October 09, 2008 |
| DOI： |
| Key words:Changjiang Estuary total organic carbon total nitrogen biogenic silica stable carbon isotopes eutrophication |
| 中文关键词: Changjiang Estuary total organic carbon total nitrogen biogenic silica stable carbon isotopes eutrophication |
| 基金项目: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. |
| Author Name | Affiliation | E-mail | | FENG Xuwen | Geology Science Department, Zhejiang University, Hangzhou 310027, China
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | fengxuwen2006@126.com | | JING Xianglong | Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
Laboratory of Submarine Geosciences of State Oceanic Administration, Second Institute Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | YU Xiaoguo | Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
Laboratory of Submarine Geosciences of State Oceanic Administration, Second Institute Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | LI Hongliang | 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 | | | 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 | | | QIAN Jiangchu | Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
Laboratory of Submarine Geosciences of State Oceanic Administration, Second Institute Oceanography, State Oceanic Administration, Hangzhou 310012, China | |
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| Abstract: |
| 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. |
| 中文摘要: |
| 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. |
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