干旱区生态环境知识资源中心(Arid): The underground leakage process of soil patches around bedrock outcrops in a karst rocky desertification area traced using rare earth elements

Arid

DOI	10.1016/j.jhydrol.2023.129316
	The underground leakage process of soil patches around bedrock outcrops in a karst rocky desertification area traced using rare earth elements
	Peng, Xudong; Dai, Quanhou; Li, Changlan; Xu, Shengbing
通讯作者	Dai, QH
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2023
卷号	619
英文摘要	The loss of soil through underground leakage is a unique erosion process in the rocky karst desertification areas with abundant bedrock outcrops. Although some effort has been made to understand soil leakage loss, until now, the processes and ways that soil leakage loss occur have continued to puzzle us in this area. To solve this problem, three typical soil patches around bedrock outcrops were selected on a sloped farmland in a rocky karst desertification area located in Guizhou, China. Stable rare earth element tracing techniques combined with a streaking and marking method were used to observe the soil leaking process under three intervals of natural rainfall (accumulated rainfall was 104.5 mm, 151.2 mm and 332.7 mm for each interval). We found that rainstorms or heavy rainstorms are the key factors that cause the loss of soil around outcrop bedrock outcrops, where the main form of soil leakage is the downwards creeping of the soil layer. The soil creep displacement associated with the rainfall total of 104.5 mm (which consisted of one rainstorm, two moderate rain events and several light rain events) could account for more than 62.5% of the total creep associated with the rainfall total of 332.7 mm. However, the rainfall total of 181.5 mm (which consisted of a heavy rain episode, four moderate rain events and several light rain events) accounted for less than 15.0%. During different rainfall events, the con-centrations of Ce, La and Sm in patches of soil around bedrock outcrops are negative compared with the background values in soil layers with treated with rare earth elements (REEs), while the concentrations of Ce, La and Sm used for comparison have a certain presence in other soil layers. Additionally, the concentrations of Ce, La and Sm at the rock-soil interface are not always higher or lower than those of the corresponding soil layer. It is proven that the soils in both the rock-soil interface and soil layer can leak downwards with a certain degree of probability. During the leaking processes, these soils do not move down uniformly or as a whole, but some particles in certain layers migrate to the lower layer separately. Therefore, improving soil anti-erodibility can prevent the creep leakage of soil patches to a certain extent and further preserve a sufficient material basis for plant restoration in rocky desertification areas.
英文关键词	Underground leakage Soil around bedrock outcrops Rock soil interface Rare earth element tracing Karst rocky desertification area
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000952621000001
WOS关键词	EROSION PROCESSES ; RUNOFF ; SLOPES ; CHINA ; MODEL
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397392
推荐引用方式 GB/T 7714	Peng, Xudong,Dai, Quanhou,Li, Changlan,et al. The underground leakage process of soil patches around bedrock outcrops in a karst rocky desertification area traced using rare earth elements[J],2023,619.
APA	Peng, Xudong,Dai, Quanhou,Li, Changlan,&Xu, Shengbing.(2023).The underground leakage process of soil patches around bedrock outcrops in a karst rocky desertification area traced using rare earth elements.JOURNAL OF HYDROLOGY,619.
MLA	Peng, Xudong,et al."The underground leakage process of soil patches around bedrock outcrops in a karst rocky desertification area traced using rare earth elements".JOURNAL OF HYDROLOGY 619(2023).