干旱区生态环境知识资源中心(Arid): Revegetation impacts on runoff generation processes in a typical loess catchment

Arid

DOI	10.1002/hyp.15092
	Revegetation impacts on runoff generation processes in a typical loess catchment
	Pan, Hailong; Ran, Qihua; Ye, Sheng
通讯作者	Ye, S
来源期刊	HYDROLOGICAL PROCESSES
ISSN	0885-6087
EISSN	1099-1085
出版年	2024
卷号	38 期号:2
英文摘要	Since 1999, large-scale ecosystem restoration has been implemented in the Loess Plateau, effectively increasing regional vegetation coverage. Vegetation restoration has significantly elevated the saturated hydraulic conductivity (Ks) of the near-surface soil layers and increased the vertical heterogeneity of the Ks profile. Many studies have examined the change of runoff due to revegetation, yet the impacts of Ks profile on the soil moisture distribution and runoff generation processes were less explored. In this study, numerical simulations were conducted to investigate how changes in the Ks profile caused by vegetation restoration influenced the hydrological responses at event scale. The numerical simulation results show that the increase of surface Ks caused by vegetation restoration can effectively reduce runoff at event scale. Moreover, the enhancement of vertical heterogeneity of Ks profiles can significantly change the vertical profile of soil water content, prompting more water to percolate into the deep soil layer. When rainfall exceeds a threshold, the accumulation of soil water above the relatively less permeable layer can cause short-term saturation in shallow soil layers, resulting in a transient perched water table. As a result, after the vegetation restoration in the Loess Plateau, though Horton overland flow is still the main runoff generation mechanism, there is a possibility of the emergence of Dunne overland flow under the high vegetation coverage (e.g., NDVI larger than 0.5). This emergence of new runoff generation mechanism, saturation excess runoff, in the Loess Plateau due to the vegetation restoration could provide scientific guidance for water and sediment movement, soil and water conservation practices, and desertification control in the Loess Plateau. Vertical heterogeneity of saturated hydraulic conductivity (Ks) amplified by revegetation could lead to significant runoff reduction. Significant revegetation can enhance the infiltration, altering rainfall partitioning at event scale. Higher NDVI, corresponding to larger surface Ks, leads to a shift in runoff generation mechanism, from HOF to shallow DOF in the Loess Plateau. image
英文关键词	Loess Plateau revegetation runoff generation mechanism saturated hydraulic conductivity (Ks) soil moisture redistribution
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001156172700001
WOS关键词	SOIL HYDRAULIC CONDUCTIVITY ; LAND-USE ; OVERLAND-FLOW ; VEGETATION RESTORATION ; SEDIMENT TRANSPORT ; HYDROLOGICAL RESPONSE ; RAINFALL INTENSITY ; EROSION PROCESSES ; WATER STORAGE ; NORTH-AMERICA
WOS类目	Water Resources
WOS研究方向	Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/404111
推荐引用方式 GB/T 7714	Pan, Hailong,Ran, Qihua,Ye, Sheng. Revegetation impacts on runoff generation processes in a typical loess catchment[J],2024,38(2).
APA	Pan, Hailong,Ran, Qihua,&Ye, Sheng.(2024).Revegetation impacts on runoff generation processes in a typical loess catchment.HYDROLOGICAL PROCESSES,38(2).
MLA	Pan, Hailong,et al."Revegetation impacts on runoff generation processes in a typical loess catchment".HYDROLOGICAL PROCESSES 38.2(2024).