CollectHomepage AdvertisementContact usMessage

干旱区地理 ›› 2019, Vol. 42 ›› Issue (1): 29-37.doi: 10.12118/j.issn.1000-6060.2019.01.04

Previous Articles     Next Articles

Grain size characteristic of regional sand-dust accumulation system in southwest of Poyang Lake

WANG Xi-mei1,2,ZHANG Zhi1,2,Ling Chao-hao3,Wan Zhi-wei1,2,JIA Yu-lian1,2, WANG Ye-qiao2   

  1. 1 School of Environment and Geography, Jiangxi Normal University, Nanchang, 330022, Jiangxi, China; 
    2 Ministry of Education Key Laboratory of Poyang Lake Wetland and Watershed Research, Nanchang 330022, Jiangxi, China; 
    3 Nanjing Institute of Geography&Limnology Chinese Academy of Sciences, Nanjing, 210008, Jiangsu, China
  • Online:2019-01-25 Published:2019-01-16
  • Contact: 贾玉连(1971- ),男,山东莱芜人,副教授,博士研究生,研究方向为全球变化与人地关系.E-mail: northforest@sohu.com

Abstract: The yellow brown soil had been formed in the downwind direction of the aeolian sand deposits in the southwestern margin of Poyang Lake which was revealed by OSL age test as the sand and dust accumulations in the last glacial period. According to the grain size analysis and the geomorphology and sedimentology study of the sand hill and the solum (yellow brown soil) in the Houtian-Daguling transect in the south-west bank of the Gan River, we concluded that sedimentary facies of this section had been transmitted from sand to sandy loess soil to clay loess along the direction (NE 30°) of the present winter monsoon. The grain composition and parameters show a systematic change from the north to the south with carry momentum and single and stable provenance. The grain parameters displayed a differential mode of a logarithmic function with the distance to the provenance. Within the distance of 20 km, they changed significantly, but out of this distance, they gradually tended to be stable. Thus, the distance of 20 km might be a characteristic distance for debris sorting. The OSL age test shows that the accumulation system was generated from (94.18±4.82)ka which is consistent with the regional age framework. The study of regional sand-dust accumulation system in this area will provide a theoretical basis for the provenance identification of dust accumulation.

Key words: Houtian-Daguling transect, regional sand-dust accumulation system, yellow-brown soil, grain size, systematic change