生态环境学报Issue(3)：458-464,7.
浙江三门湾沉积记录：U k37表层海水温度和浮游植物群落变化与El Niño/La Niña的关联
The sediment records in the Core H30 from the Sanmen Bay, Zhejiang:the relationship between Uk37 sea surface temperature, the changes in phytoplankton community and El Niño/La Niña events
摘要
Abstract
Historical sea surface temperature (SST) record during the past~180 years was reconstructed using the unsaturation index of long-chain Alkenones (Uk37) in the sediment sampled from the Sanmen Bay. Simultaneously, changes of single-diatom, single-dinoflagellate and single-coccolithophores were recovered using three biomarkers, brassicasterol, dinoflagellate sterol and long-chain Alkenones. The results show that the reconstructed SST varies between 15.19~17.61 ℃, which is closed to the observation SST values in fall, and its secular trend is consistent with the global warming. The SST fluctuation may be related to the El Niño/La Niña oscillations. The gross primary productivities range from 710.7 to 6 998.5 ng/g and also show upward trend in the past 180 years. The most abundant phytoplankton in the sediment is diatom and the secondary dinoflagellate. Diatom/Dinoflagellate ratio fluctuated in the range of 2.6~7.2, which indicate sensitivity of the coastal phytoplankton in response to the changes in the marine environment. The abundance of phytoplankton cell and the community structure can be dramatically influenced by El Niño events, when the abundance of phytoplankton cell increases, but the number of the species and population diversity decrease significantly. As no regular seasonal pattern in the change of the abundance of phytoplankton cell, we conclude that the El Niño condition should be the primary influcencing factor to that change.关键词
沉积地层记录/Uk37/表层温度/El Niño/La Niña事件/浮游植物标志物/群落结构变化Key words
stratigraohic record/Uk37/surface temperature El Niño/La Niña event/phytoplankton markers/community structure分类
海洋科学引用本文复制引用
赵庆英,陈荣华,卢冰,叶新荣,胡锡钢..浙江三门湾沉积记录：U k37表层海水温度和浮游植物群落变化与El Niño/La Niña的关联[J].生态环境学报,2013,(3):458-464,7.基金项目
国家重点基础研究专项资助项目（40876063）；浙江省自然科学基金 （）
