Acta Geographica Sinica ›› 2010, Vol. 65 ›› Issue (1): 37-52.doi: 10.11821/xb201001005

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A Preliminarily Quantitative Estimation of the Sedimentation and Erosion Rates of Loess Deposits in Chinese Loess Plateau over the Past 250 ka

LI Lang-ping; LU Hua-yu   

  1. School of Geographic and Oceanographic Sciences; Nanjing University; Nanjing 210093; China
  • Online:2010-01-25 Published:2010-03-31
  • Supported by:

    Open Fund of State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, No.10501-228; Doctoral Program Fund, Ministry of Education of People's Republic of China, No. 20090091110035; National Natural Science Foundation of China, No.40930103

Abstract:

Loess is widely distributed in Chinese Loess Plateau,and the aeolian sediments have been regarded as one of the most vigorous terrestrial records of paleoclimatic changes during the Quaternary.So far,a large number of investigations have been carried out on palaeoenvironmental changes.However,origination,transportation,and deposition of the eolian sediments,as well as the erosion after deposition,have not been well understood.In this study,we examine 84 individual representative loess-paleosol sections collected from our measurements and literatures,and estimate the total dust deposition amounts and average mass accumulation rates on the Loess Plateau of each glacial or interglacial period over the past 250 ka by remote sensing analysis and Kriging interpolation method.The results provide new evidence for the relation between regional dust deposition and orbit-scale climate changes:the dust accumulation rate is higher in the glacial periods than that in the interglacial periods.Furthermore,based on the modern observation,we estimate average surface erosion rates on the Loess Plateau in each glacial or interglacial period over the past 250 ka as well.The primary results show that there exists relatively intense erosion on the Loess Plateau in the recent geological past,and the surface erosion in the glacial periods is mildly stronger than that in the interglacial periods.

Key words: Loess Plateau, The Quaternary, dust deposition, erosion, quantitative estimation

CLC Number: 

  • P467