干旱区生态环境知识资源中心(Arid): Tracer vertical movement and its affecting factors in karst soil profiles in simulated leaching context

Arid

DOI	10.1007/s11368-021-03063-1
	Tracer vertical movement and its affecting factors in karst soil profiles in simulated leaching context
	He, Jianghu; Zhang, Keli; Cao, Zihao; Ke, Qihua
通讯作者	Zhang, KL (corresponding author), Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resources Ecol, Beijing 100875, Peoples R China.
来源期刊	JOURNAL OF SOILS AND SEDIMENTS
ISSN	1439-0108
EISSN	1614-7480
出版年	2021-09
英文摘要	Purpose The Cs-137 tracing technique has strong potential to monitor and evaluate soil loss in complex karst geomorphology regions. However, Cs-137 might move downward with soil fine particles under adequate rainfall conditions. This is critical because it directly affects accuracy of using the Cs-137 conversion model to evaluate soil erosion. Thus, the objectives of this study were to explore whether Cs-137 actually moved downward and to evaluate the movement distance and the factors influencing the movement. Materials and methods Magnetic powder (Fe3O4) and rare earth oxides (CeO2 and La2O3) were used as the substitute tracers under different conditions of a simulated leaching experiment, which possess similar properties as Cs-137 and have no radiotoxicity problems in humans and the environment. Results and discussion The results showed that tracers moved downward 6 cm when water was added to simulate 1-10-year rainfall conditions and 8 cm when water was added to simulate 15-20-year rainfall conditions. The movement distance of tracers increased slowly with increasing water input, and the concentration of the tracers that moved related indirectly to the leaching area. Tracer movement at the edge of the simulated profile was affected by tracer type and concentration since there was no transition layer between soil and plastic column. However, in the case of sufficient rainfall, the movement difference among tracers can be ignored. Previous studies and our field observations in karst watersheds showed that ignoring the vertical movement of tracer can cause the overestimation of soil loss amount by 5.83-95.23%. Conclusions This study proved that Cs-137 could move vertically in the karst area of Southwest China, and the soil loss will be overestimated if the vertical movement distance of the tracer is ignored.
英文关键词	Tracer migration Rare earth element Magnetic powder Cs-137 Soil loss estimation
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000698377400001
WOS关键词	SEDIMENT DEPOSITION ; EROSION RATES ; ROCKY DESERTIFICATION ; SOUTHWEST CHINA ; FALLOUT CS-137 ; DRIVING FORCES ; GUIZHOU ; DEPRESSION ; GUANGXI ; OXIDES
WOS类目	Environmental Sciences ; Soil Science
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
来源机构	北京师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/364025
作者单位	[He, Jianghu; Zhang, Keli; Cao, Zihao; Ke, Qihua] Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resources Ecol, Beijing 100875, Peoples R China
推荐引用方式 GB/T 7714	He, Jianghu,Zhang, Keli,Cao, Zihao,et al. Tracer vertical movement and its affecting factors in karst soil profiles in simulated leaching context[J]. 北京师范大学,2021.
APA	He, Jianghu,Zhang, Keli,Cao, Zihao,&Ke, Qihua.(2021).Tracer vertical movement and its affecting factors in karst soil profiles in simulated leaching context.JOURNAL OF SOILS AND SEDIMENTS.
MLA	He, Jianghu,et al."Tracer vertical movement and its affecting factors in karst soil profiles in simulated leaching context".JOURNAL OF SOILS AND SEDIMENTS (2021).