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| Questioning on sediment dating in the Mawoshan Karst Basin of Northwest Guizhou Province |
| Zhang Xinbao1,2 |
| 1.Key Laboratory of Mountain Environment Evolvement and Regulation,Institute of Mountain Hazards and Environment,Chengdu,Chinese Academy of Sciences,610041,Chengdu;2.State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,550002,Guiyang: China |
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Abstract It was reported in recent two papers of Mr.Xie Liangsheng and his colleagues that the average sediment accumulation thickness in the Mawoshan Karst Basin was 1.33m for the last 29 years and the related average sediment accumulation rate was 4.6cm/a and the average erosion rate was 2900.55t/(km2·a) over the catchment.But according to our researches,in a sediment profile at the centre of the basin,the 137Cs peak occurred at the depth of 40cm,and the related sediment accumulation thickness since 1963 was 20cm by subtracting the plough depth and the related average sediment accumulation rate was 0.44cm/a,which was only one tenth of the rate of 4.6cm/a,reported by Mr Xie.
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Received: 06 August 2010
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