干旱区生态环境知识资源中心(Arid): Quantitative analysis of rainwater redistribution and soil loss at the surface and belowground on karst slopes at the microplot scale

Arid

DOI	10.1016/j.catena.2023.107113
	Quantitative analysis of rainwater redistribution and soil loss at the surface and belowground on karst slopes at the microplot scale
	Fan, Chunhua; Zhao, Longshan; Hou, Rui; Fang, Qian; Zhang, Jinxin
通讯作者	Zhao, LS
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2023
卷号	227
英文摘要	On karst slopes, soil and bedrock form soil-rock structural units (SRSUs), leading to complicated soil erosion for which quantitative attribution can hardly be achieved through whole-slope tests. This study aimed to quantify the role of different SRSUs in the soil erosion process, including rock covering the soil (RCS), bedrock exposed at the surface (RES), and a thin soil layer covering bedrock (SCR). Surface flow (SF), subsurface flow (SBF), infiltrated rainwater entering underground bedrock fissures (UF) and transported sediments were measured in soil boxes representing these SRSUs on karst slopes (5 degrees and 25 degrees) under 50 mm/h rainfall. The results indicated that among the three SRSUs, SF accounted for < 1% (2.5%-4.2%) of the total rainfall on the 5 degrees slope (25 degrees slope); SBF of the SCR, RES and RCS SRSUs accounted for 12.9% (37.9%), 14.9% (46.9%) and 10.8% (35.9%), respectively, of the total rainfall on the 5 degrees slope (25 degrees slope), and UF accounted for 28.6% (6.5%), 25.7% (10.0%) and 32.3% (3.7%), respectively, of the total rainfall. The SBF values of the SCR and RES SRSUs were 23% higher than that of the RCS SRSU on average. The UF values of the SCR and RES SRSUs were 16% lower than that of the RCS SRSU on the 5 degrees slope and were 125% higher than that of the RCS SRSU on the 25 degrees slope on average. Soil loss mainly occurred through SF, and the amount of soil lost through SBF or UF was < 0.01 g/L. These results suggest that both the type of SRSU and slope could greatly influence rainwater redistribution in soil and that the rain-driven soil loss through underground bedrock fissures was low on karst slopes. This occurred because the infiltrated rainwater or rock surface flow reaching the rock-soil interface (RSI) underground became preferential flow (RSI-PF). Thereafter, part of RSI-PF entered bedrock fissures as UF, whereas the remaining RSI-PF likely seeped into the soil and contributed to SBF or SF. Therefore, on the whole slope, which comprises different SRSUs with high heterogeneity, the soil erosion process is very complex because of the interaction between the surface and subsurface.
英文关键词	Simulated rainfall Rocky land desertification Soil-rock structural unit (SRSU) Soil erosion on karst slopes Underground soil loss
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000969147100001
WOS关键词	ROCK FRAGMENT COVER ; INTERRILL RUNOFF ; STONE CONTENT ; EROSION ; DESERTIFICATION ; WATER ; LAND ; IMPACT ; MOISTURE ; GUANGXI
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/395686
推荐引用方式 GB/T 7714	Fan, Chunhua,Zhao, Longshan,Hou, Rui,et al. Quantitative analysis of rainwater redistribution and soil loss at the surface and belowground on karst slopes at the microplot scale[J],2023,227.
APA	Fan, Chunhua,Zhao, Longshan,Hou, Rui,Fang, Qian,&Zhang, Jinxin.(2023).Quantitative analysis of rainwater redistribution and soil loss at the surface and belowground on karst slopes at the microplot scale.CATENA,227.
MLA	Fan, Chunhua,et al."Quantitative analysis of rainwater redistribution and soil loss at the surface and belowground on karst slopes at the microplot scale".CATENA 227(2023).