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An experimental study on the effects of grass root density on gully headcut erosion in the gully region of China's Loess Plateau

文献类型：期刊论文

作者Guo, Mingming3; Wang, Wenlong2,3; Shi, Qianhua3; Chen, Tongde3; Kang, Hongliang3; Li, Jianming1,2
刊名LAND DEGRADATION & DEVELOPMENT
出版日期2019-08-07
页码19
ISSN号1085-3278
关键词headcut erosion Loess Plateau morphological evolution rainfall pattern root density
DOI10.1002/ldr.3404
通讯作者Wang, Wenlong(nwafu_wwl@163.com)
英文摘要Vegetation plays an important role in gully headcut erosion in China's Loess Plateau, but little is known about the effects of root density on gully headcut erosion. This study attempted to investigate the effects of grass root density on gully headcut erosion and morphological development of the gully head using plots with different grass root densities (with bare land as the control). The experiment was performed on plots with different grass root densities, and the rainfall intensity and inflow discharge increased throughout the experiment. The results showed that headcut migration in bare land was mainly activated by upstream flow incision, headwall erosion, and plunge pool erosion, whereas headcut migration in grassland was driven by soil-root matrix collapse at the headcut, headwall erosion, and plunge pool erosion. The soil loss rate (SLR), gully headcut retreat distance (GRD), gully area (GA), and upstream soil loss volume (SLVU) in grassland plots with different root densities were 45.64-68.45%, 66.97-85.38%, 69.26-78.18%, and 67.89-87.02% less than those in the bare land plots, respectively. However, as root density increased, the gully depth in the grassland plots increased from 19% to 59%, and the proportion of gully head soil loss volume (SLVGH) to the total soil loss volume increased from 63.37% to 88.37%. The SLR, GRD, GA, and SLVGH showed decreasing trends as the root density increased, as described by a Hill curve. Moreover, roots with diameters of 0-0.5 mm had greater effects on soil loss and morphological evolution than roots with larger diameters. Our results provide a reference for the reasonable selection of grass root density for controlling gully headcut erosion in China's Loess Plateau.
WOS关键词DRY-HOT VALLEY ; CONCENTRATED FLOW EROSION ; INITIAL STEP HEIGHT ; RAINFALL INTENSITY ; INTERRILL EROSION ; BANK GULLIES ; SOIL-EROSION ; PLANT-ROOTS ; VEGETATION ; RUNOFF
资助项目Western Action Plan Project of the Chinese Academy of Sciences[KZCX-XB3-13] ; National Natural Science Foundation of China[41302199] ; National Natural Science Foundation of China[41571275] ; National Natural Science Foundation of China[41790444/D0214]
WOS研究方向Environmental Sciences & Ecology ; Agriculture
语种英语
出版者WILEY
WOS记录号WOS:000481153300001
资助机构Western Action Plan Project of the Chinese Academy of Sciences ; National Natural Science Foundation of China
源URL[http://ir.igsnrr.ac.cn/handle/311030/69027]  
专题中国科学院地理科学与资源研究所
通讯作者Wang, Wenlong
作者单位1.Yangtze River Sci Res Inst, Dept Soil & Water Conservat, Wuhan 4300104, Hubei, Peoples R China
2.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China
3.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Inst Water & Soil Conservat, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式
GB/T 7714		 Guo, Mingming,Wang, Wenlong,Shi, Qianhua,et al. An experimental study on the effects of grass root density on gully headcut erosion in the gully region of China's Loess Plateau[J]. LAND DEGRADATION & DEVELOPMENT,2019:19.
APA Guo, Mingming,Wang, Wenlong,Shi, Qianhua,Chen, Tongde,Kang, Hongliang,&Li, Jianming.(2019).An experimental study on the effects of grass root density on gully headcut erosion in the gully region of China's Loess Plateau.LAND DEGRADATION & DEVELOPMENT,19.
MLA Guo, Mingming,et al."An experimental study on the effects of grass root density on gully headcut erosion in the gully region of China's Loess Plateau".LAND DEGRADATION & DEVELOPMENT (2019):19.

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来源：地理科学与资源研究所

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