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《Journal of Anhui Agricultural Sciences》 2009-35
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Application of Sequential Clustering Method in the Vertical Dividing of Sediments Grain-size

CHEN Bi-shan et al (School of Geography Science,Guangzhou University,Guangzhou,Guangdong 510006)  
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 indicated 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 holocene(8 850-4 400 a B.P.)and late holocene(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dry and wet in Gahai area were coincident with other research results that used ice cores,pollen and other records of historical documents at home and abroad.It showed that this method in the dividing sediments grain-size had higher practical value in improving rationality and scientificalness.
【Fund】: 国家自然科学基金项目(40671187)资助
【CateGory Index】: P512.2
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