A quantitative analysis on the sources of dune sand in the Hulun Buir Sandy Land:application of stepwise discriminant analysis (SDA) to the granulometric data  

作　　者：HANGuang ZHANGGuifang YANGWenbin 

机构地区：[1]CollegeofResourcesandEnvironmentalSciences,HunanNormalUniversity,Changsha410081,China [2]CollegeofCivilEngineering,HunanUniversity,Changsha410082,China [3]ForestryAcademyofInnerMongolia,Huhhot010010,China

出　　处：《Journal of Geographical Sciences》2004年第2期177-186,共10页地理学报（英文版）

基　　金：CSCspecialstartingfundforscholarsreturningfromabroad;No.[2002]247

摘　　要：Quantitatively determining the sources of dune sand is one of the problems necessarily and urgently to be solved in aeolian landforms and desertification research. Based on the granulometric data of sand materials from the Hulun Buir Sandy Land, the paper employs the stepwise discriminant analysis technique (SDA) for two groups to select the principal factors determining the differences between surface loose sediments. The extent of similarity between two statistical populations can be described quantitatively by three factors such as the number of principal variables, Mahalanobis distance D 2 and confidence level 琢for F-test. Results reveal that: 1) Aeolian dune sand in the region mainly derives from Hailar Formation (Q 3 ), while fluvial sand and palaeosol also supply partially source sand for dunes; and 2) in the vicinity of Cuogang Town and west of the broad valley of the lower reaches of Hailar River, fluvial sand can naturally become principal supplier for dune sand.Quantitatively determining the sources of dune sand is one of the problems necessarily and urgently to be solved in aeolian landforms and desertification research. Based on the granulometric data of sand materials from the Hulun Buir Sandy Land, the paper employs the stepwise discriminant analysis technique (SDA) for two groups to select the principal factors determining the differences between surface loose sediments. The extent of similarity between two statistical populations can be described quantitatively by three factors such as the number of principal variables, Mahalanobis distance D 2 and confidence level 琢for F-test. Results reveal that: 1) Aeolian dune sand in the region mainly derives from Hailar Formation (Q 3 ), while fluvial sand and palaeosol also supply partially source sand for dunes; and 2) in the vicinity of Cuogang Town and west of the broad valley of the lower reaches of Hailar River, fluvial sand can naturally become principal supplier for dune sand.

关 键 词：Hulun Buir Sandy Land granulometric analysis stepwise discriminant analysis dune sand Hailar Formation fluvial sandy sediments 

分 类 号：S157[农业科学—土壤学]