• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Erosion and sediment yields in the changing environment >Use of ~(137)Cs and ~(210)Pb_(ex) peaks produced by events in the catchment for dating sediments in the Jiulongdian Reservoir, Chuxiong, Yunnan Province, China
【24h】

Use of ~(137)Cs and ~(210)Pb_(ex) peaks produced by events in the catchment for dating sediments in the Jiulongdian Reservoir, Chuxiong, Yunnan Province, China

机译：流域事件产生的〜（137）Cs和〜（210）Pb_（ex）峰在中国云南省楚雄市九龙店水库的沉积物年代测定中的应用

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A 393-cm long sediment core was collected from the Jiulongdian Reservoir in 2004. In addition to the expected 1963 ~(137)Cs peak at a depth of 231-237 cm, there was an unusual ~(137)Cs and ~(210)Pb_(ex) peak at a depth of 15-21 cm. The ~(137)Cs and ~(210)Pb_(ex) peak is related to a forest fire occurring in the spring of 1998 and can be used for sediment dating. The ~(210)Pb_(ex) peak at a depth of 331-337 cm reflects the surface horizon of the original soil beneath the reservoir, which has been buried by the reservoir deposits since the reservoir was built in 1958. Based on the storage volume vs depth relationship for the reservoir, the amounts of sediment deposited during the periods 1959-1962, 1963-1997 and 1998-2003 were estimated to be 249.48 ×10~4t, 262.78×10~4t and 30.94 ×10~4t, respectively. The corresponding specific sediment yields for the three periods are estimated to be 2421.2 t km~(-2) year~(-1), 291.5 t km~(-2) year~(-1) and 200.2 t km~(-2) year~(-1), respectively. The highest specific sediment yields were associated with deforestation during the "Great Leap Forward" of 1958-1959. However, the severe erosion resulting from deforestation rapidly declined when the natural vegetation re-established itself after deforestation ceased.
机译：2004年从九龙店水库收集了一个393厘米长的沉积岩心。除了在231-237厘米深度处预期的1963〜（137）Cs峰值外，还有一个不寻常的〜（137）Cs和〜（210） Pb_（ex）峰在15-21厘米深度处。 〜（137）Cs和〜（210）Pb_（ex）峰与1998年春季发生的森林大火有关，可用于沉积物测年。 〜（210）Pb_（ex）峰在331-337 cm的深度处反映了储层下面原始土壤的表面水平，自1958年建储层以来，该土壤一直被储层沉积物掩埋。根据水库的体积与深度的关系，在1959-1962年，1963-1997年和1998-2003年期间沉积物的沉积量分别估计为249.48×10〜4t，262.78×10〜4t和30.94×10〜4t 。三个时期对应的比泥沙产量估计分别为2421.2 t km〜（-2）年〜（-1），291.5 t km〜（-2）年〜（-1）和200.2 t km〜（-2 ）年〜（-1）。在1958-1959年的“大跃进”期间，最高的特定沉积物产量与森林砍伐有关。但是，当砍伐森林后自然植被重新建立时，森林砍伐造成的严重侵蚀迅速减少。

著录项

  • 来源
  • 会议地点 Chengdu(CN)
  • 作者

    XINBAO ZHANG; YI LONG; XIUBIN HE; ANBANG WEN; DONGCHUN YAN;

  • 作者单位

    Key Laboratory of Mountain Environmental Change and Regulation, Institute of Mountain Hazards and Environment, C.A.S., Chengdu, 610041, China;

    Key Laboratory of Mountain Environmental Change and Regulation, Institute of Mountain Hazards and Environment, C.A.S., Chengdu, 610041, China;

    Key Laboratory of Mountain Environmental Change and Regulation, Institute of Mountain Hazards and Environment, C.A.S., Chengdu, 610041, China;

    Key Laboratory of Mountain Environmental Change and Regulation, Institute of Mountain Hazards and Environment, C.A.S., Chengdu, 610041, China;

    Key Laboratory of Mountain Environmental Change and Regulation, Institute of Mountain Hazards and Environment, C.A.S., Chengdu, 610041, China;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ~(137)Cs; ~(210)Pb_(ex); reservoir; sediment core; forest fire; deforestation; soil erosion;

    机译：〜（137）碳; 〜（210）Pb_（ex）;水库沉积物芯森林火灾;毁林水土流失;

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号