Magnitude of soil erosion in small catchments with different land use patterns under an extreme rainstorm event over the Northern Loess Plateau, China

doi:10.1016/j.catena.2020.104780

	Magnitude of soil erosion in small catchments with different land use patterns under an extreme rainstorm event over the Northern Loess Plateau, China
	Wang, Nan 1,4; Jiao, Juying 1,2,3; Bai, Leichao 3; Zhang, Yifeng 3; Chen, Yixian 1,4; Tang, Bingzhe 3; Liang, Yue 1,4; Zhao, Chunjing 3; Wang, Haolin 3
刊名	CATENA
	2020-12-01
卷号	195 页码:10
关键词	Extreme rainstorm Dam-controlled catchment Soil erosion Land use distribution pattern
ISSN号	0341-8162
DOI	10.1016/j.catena.2020.104780
通讯作者	Jiao, Juying(jyjiao@ms.iswc.ac.cn)
英文摘要	Characteristics of soil erosion under extreme rainfall conditions are indicators of the ecological restoration measures as well as the rationality of land use patterns in the region. To this end, 12 dam-controlled catchments were selected for investigation after an extreme rainstorm event in the northern Shaanxi Province on 25-26 July 2017 (known as the "7.26" rainstorm). Soil erosion intensities in the 12 catchments were obtained by excavations of sedimentation profiles and sedimentation area measurements. Digital orthophoto maps and digital terrain models by unmanned aerial vehicle were generated to characterise land use types and areas, slope gradients, and the distance from the land to the boundary of dam-land along the flow accumulation path. Stepwise regression analysis was used to determine the main factors affecting catchment erosion intensity. Results showed that the average sedimentation thickness and overall soil erosion intensity across the 12 catchments ranged from 0.16 to 1.67 m and 10295-49227 t km(-2), respectively. Soil erosion caused by the extreme rainstorm was 10-50 times of the soil loss tolerance on the Loess Plateau (1000 t km(-2) year(-1)). Stepwise regression analysis revealed that the more similar the shape of a catchment to a circle, the closer the distance between the slope-cropland and dam-land, the larger the erosion modulus within the catchment. Furthermore, the presence of a cement road along the valley shoulder greatly reduced the modulus of soil erosion. These findings indicate that the existing ecological conditions in the dam-controlled catchments were not able to effectively resist erosion under the extreme rainfall conditions of this event. Thus, optimising the distribution of land use types within catchments should be a focus for soil erosion control.
资助项目	National Key Research and Development Program of China[2016YFC0501604] ; Open Project Fund of Key Laboratory of the Loess Plateau Soil Erosion and Water Loss Process and Control, Ministry of Water Resources[2019001]
WOS关键词	OPTIMIZATION MODEL ; SEDIMENT YIELD ; COVER ; ALLOCATION ; RUNOFF ; GREEN ; BASIN ; GRAIN
WOS研究方向	Geology ; Agriculture ; Water Resources
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000580366300031
资助机构	National Key Research and Development Program of China ; Open Project Fund of Key Laboratory of the Loess Plateau Soil Erosion and Water Loss Process and Control, Ministry of Water Resources
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/156549]
专题	中国科学院地理科学与资源研究所
通讯作者	Jiao, Juying
作者单位	1.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 2.Minist Water Resources, Key Lab Loess Plateau Soil Eros & Water Loss Proc, Zhengzhou 450003, Henan, Peoples R China 3.Northwest A&F Univ, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wang, Nan,Jiao, Juying,Bai, Leichao,et al. Magnitude of soil erosion in small catchments with different land use patterns under an extreme rainstorm event over the Northern Loess Plateau, China[J]. CATENA,2020,195:10.
APA	Wang, Nan.,Jiao, Juying.,Bai, Leichao.,Zhang, Yifeng.,Chen, Yixian.,...&Wang, Haolin.(2020).Magnitude of soil erosion in small catchments with different land use patterns under an extreme rainstorm event over the Northern Loess Plateau, China.CATENA,195,10.
MLA	Wang, Nan,et al."Magnitude of soil erosion in small catchments with different land use patterns under an extreme rainstorm event over the Northern Loess Plateau, China".CATENA 195(2020):10.