| 黔西北麻窝山岩溶盆地沉积物断代的质疑 |
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| 引用本文： | 张信宝.黔西北麻窝山岩溶盆地沉积物断代的质疑[J].中国水土保持科学,2010,8(6):93-94. |
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| 作者姓名： | 张信宝 |
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| 作者单位： | [1]中国科学院水利部成都山地灾害与环境研究所,环境演变与调控重点实验室,成都610041 [2]中国科学院地球化学研究所,环境地球化学国家重点实验室,贵阳550002 |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973)项目，中国科学院西部行动计划项目，中国科学院地球化学研究所环境地球化学国家重点实验室资助项目 |
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| 摘 要： | 据谢良胜等的2篇文章报道,黔西北麻窝山岩溶盆地近29年来平均沉积厚度1.33 m,沉积速率4.6 cm/a,流域平均侵蚀模数为2 900.55 t/(km2.a)。而根据笔者的研究成果,该岩溶盆地中央部位沉积物剖面中,表征1963年沉积的137Cs峰值深度为40 cm,减去犁耕层深度,1963年以来的沉积厚度为20 cm,年均沉积速率为0.44 cm/a,此值仅为谢良胜等研究结果4.6 cm/a的1/10。
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| 关 键 词： | 岩溶盆地 137Cs 沉积物断代 质疑 黔西北 |
Questioning on sediment dating in the Mawoshan Karst Basin of Northwest Guizhou Province |
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| Zhang Xinbao.Questioning on sediment dating in the Mawoshan Karst Basin of Northwest Guizhou Province[J].Science of Soil and Water Conservation,2010,8(6):93-94. |
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| Authors: | Zhang Xinbao |
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| Institution: | Zhang Xinbao,(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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| Keywords: | mawoshan karst basin 137Cs sediment dating questioning Northwest Guizhou Province |
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