有序聚类方法在沉积物粒度分带中的应用  

Application of Sequential Clustering Method in the Vertical Dividing of Sediments Grain-size

作　　者：陈碧珊[1] 潘安定[1] 李冰[1] 

机构地区：[1]广州大学地理科学学院,广东广州510006

出　　处：《安徽农业科学》2009年第35期17679-17682,共4页Journal of Anhui Agricultural Sciences

基　　金：国家自然科学基金项目(40671187)资助

摘　　要：针对现阶段湖泊沉积物粒度特征研究中垂直剖面分层方法所存在的数学方法的不足,借鉴孢粉分带比较成熟的案例,应用有序聚类法中次序不变的特点,以柴达木盆地尕海湖DG02钻孔338个经激光粒度仪测试的样品为研究对象,在有序聚类的数学理论基础上,借助Tilia软件将湖泊沉积物垂直剖面进行分层。研究结果表明,柴达木盆地尕海湖地区环境演化大致经过4个阶段:冰消期晚期(3 109～3 454 cm)、早全新世(2 623～3 109 cm)、中全新世(1 114～2 623 cm)和晚全新世(50～1 114 cm)。通过与孢粉结果及前人研究结果进行对比,有序聚类法分类结果与现有分析结果较为吻合,一些重要的干旱和湿润事件也与其他区域的冰芯、孢粉、历史文献等记录相一致,表明利用该方法进行粒度分带是科学合理的,具有较高的实用价值。In modern researches on the grain-size characteristics of lake sediments, the methods of incertical dividing sediments grain-size have no rigorous mathematical theory to support. To resolve this omission, the case of pollen zonation was taken for reference. 338 samples measured by Mastersizer 2000 from DG02 core of Gahai lake in Qaidam Basin were studied. Considering the clustering results of sequential clusters did not change the sequence of samples, tilia software package was used to divide the dividing sediments grain-size. The research results indicatecl that the climatic changes could be divided into four stages as follows： late deglaciation （1 1324 - 10 290 a B. P. ）, early holocene （ 10 290 - 8 850 a B. P. ）, mid holoeene （8 850 - 4 400 a B. P. ） and late holoeene （4 400 - 200 a B. P. ）. The climatic changes and the important events of dry and wet in Gahai area were coincident with other research results that used ice cores ,pollen and other records of historical documents at home and abroad. It showed that this method in the dividing sediments grain-size had higher practical value in improving rationality and scientificalness.

关 键 词：有序聚类法 粒度 孢粉 尕海湖 

分 类 号：X513[环境科学与工程—环境工程]