| 从藻类化石的垂直分布探讨杭州西湖的演变历程 |
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| 引用本文： | 项斯端,赵建康,周宏,王江毅.从藻类化石的垂直分布探讨杭州西湖的演变历程[J].海洋与湖沼,1999,30(1):14-24. |
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| 作者姓名： | 项斯端 赵建康 周宏 王江毅 |
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| 作者单位： | [1]浙江大学生命科学学院 [2]浙江省地质环境监测总站 |
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| 基金项目： | 国家自然科学基金!39370140 |
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| 摘 要： | 于１９９４年春在杭州西湖东北面，西面及湖中心小瀛洲３个钻孔共取了７０号岩芯样，经浮选，筛选，以显微镜检鉴定化石藻种，并分析其垂直分布，从而探讨西湖的形成历史，西湖自晚更新世以来的６个化石藻带由下而上依次为：轮藻带，微藻带，微红金颗藻－近缘针杆藻－条纹小环藻带，圆筛藻带，圆筛藻－近缘针杆藻－微红金颗藻桥穹藻－异极藻－短缝藻带和水花束丝藻带，从而反映了西湖的６个发育时期，淡水古湖沼期，淡咸水过渡期，海
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| 关 键 词： | 化石藻 硅藻 淡水藻 海藻 古植物 西湖演变 |
| 收稿时间： | 7/8/1996 12:00:00 AM |
| 修稿时间： | 1998/7/12 0:00:00 |
PROBING INTO THE HISTORY OF THE WEST LAKE, HANGZHOU, BASED UPON THE VERTICAL DISTRIBUTION OF ALGAL MICROFOSSILS |
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| XIANG Si-duan,ZHAO Jian-kang,ZHOU Hong and WANG Jiang-yi.PROBING INTO THE HISTORY OF THE WEST LAKE, HANGZHOU, BASED UPON THE VERTICAL DISTRIBUTION OF ALGAL MICROFOSSILS[J].Oceanologia Et Limnologia Sinica,1999,30(1):14-24. |
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| Authors: | XIANG Si-duan ZHAO Jian-kang ZHOU Hong and WANG Jiang-yi |
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| Institution: | College of Life Science,Zhejiang University,Hangzhou 310012;The Geological Environmental Monitoring Station of Zhjiang,Hangzhou,310007;College of Life Science,Zhejiang University,Hangzhou 310012;College of Life Science,Zhejiang University,Hangzhou 310012 |
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| Abstract: | In spring 1994, 70 sediment samples from 3 cores, collected from the northeasternshore (X1), western shore (X2) and Xiaoyingzhou (No. 6) of the West Lake were analyzed. 63species of microfossil algae are found, including 79% of diatoms; these algal microfossils made up18 assemblages. From bottom to top, the core X1 is divided into six algal zones according toindicator species of algal assemblages I. Clara zone' - 32- - 29m; II. Chrysococcus rubescens-Synedra affinis-Cyclotella striata zone: - 29.O- - 24m, characterized by cocxistence of fresh wateralgae, brackish water algae and marine algae; III. Coscinodiscus zone' - 24- - l3m, mdrine algaezone, IV. Coscinodisus-Synedra affainis-Chrysococcus rubescens zone: - 13- - 7m, coexistence ofmarine, brackish and fresh-water algae, V. Cymbella-Gomphonema -Ennotia zone: - 7 - - 4m,freshwater epiphytic algae zone; VI. Aphanizomenon zone: - 4m and above. These zones indicates 6deve1oping stages of the Lake i.e. paleopond stage, fresh water to marine transihonal stage, bay stage,lagoon stage, fresh water West Lake bog stage, and a eutrophic stage of fresh water.The algal zones in Cores X2 and NO. 6 are lack of Zones I, II. Thus, paleopond stage andfresh water to manne transitiona1 stage are absent at these two sites, only 4 developing stages exist.The existence of the paleopond stage shows that around 10 thousand years ago, the West Lakeoriginated from a fresh water pond, instead of a lagoon or embayment. |
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| Keywords: | Fossil algae Diatom Fresh water algae Brackish water algae Marine algae |
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