硅藻与色素在古环境演化研究中的意义——以固城湖为例  

SIGNIFICANCE OF DIATOM AND PIGMENT IN THE STUDY ON PALAEOENVIRONMENTAL EVOLUTION-A CASE STUDY OF GUCHENG LAKE. JIANGSU PROVINCE

作　　者：马燕[1] 王苏民[1] 潘红玺[1] 

机构地区：[1]中国科学院南京地理与湖泊研究所湖泊沉积与环境开放实验室,南京210008

出　　处：《湖泊科学》1996年第1期16-26,共11页Journal of Lake Sciences

基　　金：中国科学院"八五"重点项目(Z-011)资助

摘　　要：根据固城湖GS_1孔沉积物中硅藻的丰度与组合、色素的含量与有关参数,并结合孢粉、有机碳等分析数据,较详细地讨论了从晚冰期到全新世中期(15.3～6.0ka B.P.)固城湖地区古气候古环境演化的过程。同时尝试把硅藻与色素的结合作为度量湖泊古初始生产力的有效性,以及识别沉积记录有关人类活动的可能性。文中还专门论述了全新世初期海相硅藻出现的层位特点与背景,并与太湖作了比较,这一现象对重新认识长江三角洲地区的古地理环境无疑是十分重要的。According to the abundance and assemblage of diatom and content with certain parameters of pigments, and the analysis of spore-pollen and total organic carbon from the sediments of the Core GS1 of Gucheng Lake, Jiangsu Province, this paper has discussed the palaeoclimat-ic and palaeoenvironmental evolution in the Gucheng Lake region from Late Glacial period to the middle of Holocene in detail, including the formation of Gucheng Lake and monsoon rainfall at 14ka B.P. , Allerod warming period with a less effective moisture, cold and humid Younger Dryas event, a number of low temperature periods at 8. 5, 7.8 and 6. 5 ka B. P. in warm and wet climate background of early-mid Holocene. In general, the palaeolimnologic history of Gucheng Lake is macroscopically controlled by monsoon climate cycle resulted from orbital forcing, but is complicated by the intervention of marine transgression and abrupt climate event. In the meantime, the authors also try to contribute the combining of diatom and pigment to evaluate the lake paleoprimary productivity, and to distinguish the human activities in lake records. The results suggest that diatom along with pigments is not only an effective indicator for lake production, but may also be used to diagnose the texture change in algae plant community. This paper also deals with the strata characteristics and background when the marine diatom of early Holocene appeared, and makes a comparison with that from Taihu Lake. No doubt that this phenomena will be very important to get deeper insight into the palaeogeo-graphy environment of the Yangtze River Delta region.

关 键 词：硅藻丰度 色素 环境演化 固城湖 古环境 湖泊 

分 类 号：P531[天文地球—古生物学与地层学] X141[天文地球—地质学]