南极乔治王岛与象岛邻近海域表层沉积硅藻组成及分布特征
投稿时间:2018-06-13  修订日期:2018-09-07  点此下载全文
引用本文:
DOI:
摘要点击次数: 33
全文下载次数: 
作者单位E-mail
吴聪 国土资源部海底矿产资源重点实验室 gzdiatom@163.com 
基金项目:自然资源部国家专项(编号:DD20160214)和海洋地质调查计划项目(编号:ZH201100303)
中文摘要:本文对“第33次南极科考—海洋六号航次”在乔治王岛南侧、象岛西侧海域内通过箱式取样获得的表层沉积物样品进行了硅藻组成和分布特征的研究。主要统计了硅藻丰度、简单分异度、属种组成等,并结合沉积物粒度数据进行分析,结果表明乔治王岛南侧站位丰度和分异度高于象岛西侧站位,最高丰度达到1.96×106壳/g。丰度的差异分布可能主要与洋流有关,别林斯高晋海表层洋流带入充足营养盐导致乔治王岛南侧站位硅藻繁盛,而威德尔海涡流底层水影响下的象岛西侧站位则难以沉降保存包括硅藻壳体在内的细小沉积颗粒。各站位硅藻组成的差异主要体现在海冰相关种分布不均和半咸水种类繁盛情况等,前者可能与漂浮海冰控制的时间长短有关,而后者与淡水输入等综合环境因素有关。
中文关键词:乔治王岛  象岛  表层沉积物  硅藻  海冰种  洋流
 
Distribution of Diatom Assemblages in the Surface Sediments near the King George Island and Elephant Island, Antarctica
Abstract:Diatom assemblage and distribution characteristic associated with grain size of seven surface sediments in the south of King George Island and west of Elephant Island were detailed analyzed in this study. The results show that diatom abundance and diversity of the south of King George Island are distinctly higher than those of the west of Elephant Island. Site CS22 contains the highest absolute abundance with the value of 1.96×106 valves per gram. The differential distribution of diatom abundance is mainly related to the currents around the South Shetland Islands. Continuous nutrients were input from the Bellingshausen Sea surface Current along the south side of King George Island, which flourished the diatom flora in the sites CS19, CS20 and CS22. In contrast, on the west side of Elephant Island, bottom currents drived by the Weddell Sea Gyre may strongly impact the deposition of particles in the sites of CS7, CS9 and CS10. The relative abundance of sea ice-related species reflects the duration of floating sea ice and the brackish species bloom is possible related to the side discharge of freshwater.
keywords:King George Island  Elephant Island  surface sediment  diatoms  sea-ice related species  currents
  查看/发表评论  下载PDF阅读器
版权所有 《地球学报》编辑部 Copyright©2008 All Rights Reserved
主管单位:中华人民共和国自然资源部 主办单位:中国地质科学院
地址: 北京市西城区百万庄大街26号,中国地质科学院东楼317室 邮编:100037 电话:010-68327396 E-mail: diqiuxb@126.com
技术支持:北京勤云科技发展有限公司
京ICP备05029128号-6

京公网安备 11010202007616号