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首页> 外文会议>Sediment dynamics for a changing future >Preliminary investigation of the potential for using the ~(137)Cs technique to date sediment deposits in karst depressions and to estimate rates of soil loss from karst catchments in southwest China
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Preliminary investigation of the potential for using the ~(137)Cs technique to date sediment deposits in karst depressions and to estimate rates of soil loss from karst catchments in southwest China

机译：初步研究了〜（137）Cs技术对西南喀斯特洼地沉积物沉积的估算以及估算喀斯特流域土壤流失速率的潜力

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摘要

Soil erosion plays an important role in land desertification in the karst mountain areas of southwest China, but reliable data on rates of surface soil loss in the area are very limited. Hill-depressions are common landforms in the karst areas. The ~(137)Cs technique was used to date the sediment deposits in six karst depressions, to estimate average rates of surface soil loss from their catchments. The estimates of soil loss rates obtained from this study evidenced considerable variability. A value of 1.0 t km~(-2) year~(-1) was obtained for a catchment under original dense karst forest, but the erosion rates ranged between 19.3 t km~(-2) year~(-1) and 48.7 t km~(-2) year~(-1) in four catchments under secondary forest or grasses, where the original forest cover had been removed in the Ming and Qing dynasties, several hundred years ago. The highest rate of 1643 t km~(-2) year~(-1) was obtained for a catchment underlain by clayey carbonate rocks, where the soil cover was thicker and more extensive than in the other catchments and extensive land reclamation for cultivation had occurred during the period 1979-1981, immediately after the Cultural Revolution.
机译：在中国西南喀斯特山区，土壤侵蚀在土地沙漠化中起着重要作用，但是该地区表层土壤流失速率的可靠数据非常有限。丘陵洼地是喀斯特地区常见的地貌。利用〜（137）Cs技术对六个喀斯特洼地中的沉积物进行了测年，以估算其集水区表层土壤流失的平均速率。从这项研究获得的土壤流失率的估计值显示出很大的可变性。在原始的茂密喀斯特森林下的一个集水区获得了1.0 t km〜（-2）年〜（-1）的值，但侵蚀速率介于19.3 t km〜（-2）年〜（-1）和48.7之间。 t km〜（-2）year〜（-1）在次生林或草下的四个集水区中，原始森林覆盖已在几百年前的明清时期被拆除。碳质黏土岩石下的集水区最高集水量为1643 t km〜（-2）年〜（-1），其土壤覆盖比其他集水区更厚，更广泛，耕种开阔的土地开垦发生在文化大革命之后的1979-1981年。

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  • 来源
  • 会议地点 Warsaw(PL)
  • 作者

    X. B. ZHANG; X. Y. BAI; A. B. WEN;

  • 作者单位

    Key Laboratory of Mountain Environment Evolvement and Regulation, Institute of Mountain Hazards and Environment,Chinese Academy of Sciences, Sichuan 610041, China State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou 550002, China;

    Key Laboratory of Mountain Environment Evolvement and Regulation, Institute of Mountain Hazards and Environment,Chinese Academy of Sciences, Sichuan 610041, China;

    Key Laboratory of Mountain Environment Evolvement and Regulation, Institute of Mountain Hazards and Environment,Chinese Academy of Sciences, Sichuan 610041, China;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 泥沙动力学、河流动力学;
  • 关键词

    karst depression; accumulated sediment; dating; caesium-137; soil loss; erosion rates;

    机译：喀斯特洼地；沉积物约会铯137;土壤流失；侵蚀率;

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