内蒙岱海近400年来的硅藻植物群及其古环境意义  

THE RECENT 400-YEAR DIATOM HISTORY OF DAIHAI LAKE, INNERMONGOLIA WITH ADDITIONAL REFERENCE TO ITS PALEOENVIRONMENTAL SIGNIFICANCE

作　　者：马燕[1] 王苏民[1] 

机构地区：[1]中国科学院南京地理与湖泊研究所,南京210008

出　　处：《湖泊科学》1992年第2期19-24,共6页Journal of Lake Sciences

摘　　要：岱海近400年来的硅藻植物群可划分为3个组合:①Epithemia—Cymbella组合(1596—1636、1696—1836及1876—1946年),反映了温水—浅水—贫营养环境;②Melosira islandica—Fragilaria组合(1666—1696与1836—1876年间),代表了冷水—较浅水—贫营养环境;③Melosira granulata及其变种var. angustissima—Diploneis elliptica(1966年以来),反映了温水—浅水—富营养环境。1636—1666与1946—1966年间岱海中硅藻保存得很少,分别与气候寒冷而使硅藻难以生存与湖水动荡对硅藻保存不利有关。Diatoms were identified and counted in a core of 78 cm long, from which eight phases were recognized. In 1596—1636, 1696—1836 and 1876—1946,Daihai Lake supported an Epithemia/Cymbella assemblage, indicating a shallow water environment. In the two intervals of the three periods mentioned above (1666—1696 and 1836—1876), occurred a Melosira islandica/Fragilaria assemblage comparable to that in modern arctic and glacial moraine lakes. This is surely attributed to the heyday and the last oscillation of the Little Ice Age. During 1636—1666 and 1946—1966, the diatoms were too rare to be counted. Since 1966. the lake has been dominated by Melosira granulata/var, angustissima, Diploneis elliptica and Fragilaria spp. This may be due to the slightly mesotrophic water, the warmer climate and the disturbance of human beings.

关 键 词：硅藻 植物群 古环境 内蒙古 

分 类 号：Q914.82[天文地球—古生物学与地层学]