Preliminary investigation of the potential for using the Cs-137 technique to date sediment deposits in karst depressions and to estimate rates of soil loss from karst catchments in southwest 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 > 成都山地所知识仓储（2009年以前）

	Preliminary investigation of the potential for using the Cs-137 technique to date sediment deposits in karst depressions and to estimate rates of soil loss from karst catchments in southwest China
	Zhang XB; Wen AB
	2010
会议名称	International Symposium on Sediment Dynamics for a Changing Future
会议日期	2010-6-14～18
会议地点	Warsaw Univ Life Sci, Warsaw, POLAND
关键词	karst depression accumulated sediment dating caesium-137 soil loss erosion rates
页码	149-156
通讯作者	Zhang XB
英文摘要	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 Cs-137 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.
会议主办者	Hydroprojekt Sp; Minist Agr &Rural Dev; Geomor Technik Sp; AP Instruments; Reg Chamber Construct Engn; Polish Airlines LOT
会议录	SEDIMENT DYNAMICS FOR A CHANGING FUTURE
语种	英语
ISBN号	978-1-907161-10-0
内容类型	会议论文
源URL	[http://192.168.143.20:8080/handle/131551/5285]
专题	成都山地灾害与环境研究所_成都山地所知识仓储（2009年以前）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科技与合作处
推荐引用方式 GB/T 7714	Zhang XB,Wen AB. Preliminary investigation of the potential for using the Cs-137 technique to date sediment deposits in karst depressions and to estimate rates of soil loss from karst catchments in southwest China[C]. 见:International Symposium on Sediment Dynamics for a Changing Future. Warsaw Univ Life Sci, Warsaw, POLAND. 2010-6-14～18.