Use of 137Cs and 210Pbexpeaks produced by events in the catchment for dating sediments in the Jiulongdian Reservoir, Chuxiong, Yunnan Province, China

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地表生过程与生态调控重点实验室

	Use of 137Cs and 210Pbexpeaks produced by events in the catchment for dating sediments in the Jiulongdian Reservoir, Chuxiong, Yunnan Province, China
	Zhang, Xinbao; Long, Yi; He, Xiubin; Wen, Anbang; Yan, Dongchun
	2018
会议日期	October 11, 2012 - October 15, 2012
会议地点	Chengdu
关键词	~(137)Cs ~(210)Pb_(ex) reservoir sediment core forest fire deforestation soil erosion
页码	378-384
英文摘要	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.
产权排序	1
会议录	Erosion and sediment yields in the changing environment (IAHS Publ. 356)
语种	英语
ISSN号	0144-7815
ISBN号	978-1-907161-33-9
内容类型	会议论文
源URL	[http://ir.imde.ac.cn/handle/131551/23912]
专题	成都山地灾害与环境研究所_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
推荐引用方式 GB/T 7714	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]. 见:. Chengdu. October 11, 2012 - October 15, 2012.