Use of 137Cs and 210Pbexpeaks produced by events in the catchment for dating sediments in the Jiulongdian Reservoir, Chuxiong, Yunnan Province, China
语种英语
Zhang, Xinbao; Long, Yi; He, Xiubin; Wen, Anbang; Yan, Dongchun
2012
会议录名Erosion and sediment yields in the changing environment (IAHS Publ. 356)
会议录编者/会议主办者IAHS
页码378-384
会议名称IAHS international commission on continental erosion symposium
会议日期October 11, 2012 - October 15, 2012
会议地点Chengdu
会议举办国China
产权排序1
摘要A 393-cm long sediment core was collected from the Jiulongdian Reservoir in 2004. In addition to the expected 1963137Cs peak at a depth of 231-237 cm, there was an unusual137Cs and210Pbexpeak at a depth of 15-21 cm. The137Cs and210PbexPeak is related to a forest fire occurring in the spring of 1998 and can be used for sediment dating. The210Pbexpeak 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 × 104t, 262.78 × 104t and 30.94 × 104t, respectively. The corresponding specific sediment yields for the three periods are estimated to be 2421.2 t km year-1, 291.5 t km-2year-1and 200.2 t km-2· year, 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. Copyright © 2012 IAHS Press.
关键词~(137)Cs ~(210)Pb_(ex) reservoir sediment core forest fire deforestation soil erosion
ISBN号978-1-907161-33-9
ISSN号0144-7815
收录类别EI
EI收藏号Accession number:20133616706447
文献类型会议论文
条目标识符http://ir.imde.ac.cn/handle/131551/24072
专题山地表生过程与生态调控重点实验室
通讯作者Zhang, Xinbao
作者单位Key Laboratory of Mountain Environmental Change and Regulation, Institute of Mountain Hazards and Environment, C.A.S., Chengdu, 610041, China
第一作者单位Key Laboratory of Mountain Environmental Change and Regulation, Institute of Mountain Hazards and Environment, C.A.S., Chengdu, 610041, China
通讯作者单位Key Laboratory of Mountain Environmental Change and Regulation, Institute of Mountain Hazards and Environment, C.A.S., Chengdu, 610041, China
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Zhang, Xinbao,Long, Yi,He, Xiubin,et al. Use of 137Cs and 210Pbexpeaks produced by events in the catchment for dating sediments in the Jiulongdian Reservoir, Chuxiong, Yunnan Province, China[C]//IAHS,2012:378-384.
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