干旱区生态环境知识资源中心(Arid): Rainwater transformation to runoff and soil loss at the surface and belowground on soil-mantled karst slopes under rainfall simulation experiments

Arid

DOI	10.1016/j.catena.2022.106316
	Rainwater transformation to runoff and soil loss at the surface and belowground on soil-mantled karst slopes under rainfall simulation experiments
	Fang, Qian; Zhao, Longshan; Hou, Rui; Fan, Chunhua; Zhang, Jinxin
通讯作者	Zhao, LS
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2022
卷号	215
英文摘要	Karst slopes have thin soil layers covering bedrock and feature multiple near-surface soil-rock interfaces (SRIs), which can produce hydrological processes that differ from those of nonkarst slopes. This study investigated the differences in the proportions of rainwater transformed into surface and belowground runoff and measured soil loss on soil-mantled karst slopes with different hydrological situations: bedrock with fissures (HS-1) and without fissures (HS-2). The rainfall intensity was 50 mm/h. Three slope gradients (5 degrees, 15 degrees and 25 degrees) were applied, and surface runoff (SR), subsurface flow (SF), underground fissure flow (UFF) and soil-rock interface flow (SRIF) were collected during rainfall. No SR was produced on 5 degrees slopes in either treatment. The proportion of rainwater absorbed by soil (RH) was approximately 34%-46% of the rainwater, with no significant differences (p > 0.05) between HS-1 and HS-2. On the 5 degrees and 15 degrees slopes, 28%-61% of the rainwater was transformed into UFF under HS-1, and 29%-50% of the rainwater was transformed into SRIF under HS-2. On the 25 degrees slope, the SRIF and UFF proportions were<18%. Bedrock fissures greatly affected the type of runoff but had little effect on the nearsurface soil water. The SR and SF amounts were 29%-67% and 3%-38% higher in HS-2 than in HS-1, respectively. Due to bedrock fissures, on average, 6% of rainwater was lost as underground flow during rainfall, and the extra rainwater, 30% on average, flowed along the SRI underground, potentially forming UFF. This difference occurs because the infiltrating rainwater that reaches the SRI can freely drain through bedrock fissures in HS-1 but not in HS-2. The soil loss via SF, SRIF and UFF was very low (<0.05 g/L). Therefore, slope gradients and bedrock fissures both have major effects on rainwater transformation, and soil loss via rainfall impact is very slow on soil-mantled karst slopes.
英文关键词	Rocky land desertification Soil erosion Subsurface flow Surface runoff Underground fissure flow
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000798079700002
WOS关键词	ROCKY DESERTIFICATION ; SOUTHWEST CHINA ; INFILTRATION ; EROSION ; PLATEAU ; MODEL ; RATES ; WATER ; INTENSITY ; LANDSCAPE
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/2XILL650/392105
推荐引用方式 GB/T 7714	Fang, Qian,Zhao, Longshan,Hou, Rui,et al. Rainwater transformation to runoff and soil loss at the surface and belowground on soil-mantled karst slopes under rainfall simulation experiments[J],2022,215.
APA	Fang, Qian,Zhao, Longshan,Hou, Rui,Fan, Chunhua,&Zhang, Jinxin.(2022).Rainwater transformation to runoff and soil loss at the surface and belowground on soil-mantled karst slopes under rainfall simulation experiments.CATENA,215.
MLA	Fang, Qian,et al."Rainwater transformation to runoff and soil loss at the surface and belowground on soil-mantled karst slopes under rainfall simulation experiments".CATENA 215(2022).