Land use and land cover change-induced changes of sediment connectivity and their effects on sediment yield in a catchment on the Loess Plateau in China

doi:10.1016/j.catena.2021.105688

	Land use and land cover change-induced changes of sediment connectivity and their effects on sediment yield in a catchment on the Loess Plateau in China
	Liu, Wei 1,2; Shi, Changxing 2; Ma, Yongyong 3; Li, Huijuan 1,2; Ma, Xiaoqing 1,2
刊名	CATENA
	2021-12-01
卷号	207 页码:11
关键词	Sediment connectivity Land cover change Sediment yield Scenario analysis Loess Plateau
ISSN号	0341-8162
DOI	10.1016/j.catena.2021.105688
通讯作者	Shi, Changxing(shicx@igsnrr.ac.cn)
英文摘要	The spatial distribution of landscape pattern in catchments has a great impact on the potential sediment detachment and transport capacity. In this study, a sediment connectivity model was applied to evaluate the effect of the spatial distribution of landscape pattern on the sediment transfer in a typical catchment on the Loess Plateau in China based on land use and topography data in 1964, 2004, and 2018. Thereupon, the impacts of changes in different land use types on sediment connectivity and those of sediment connectivity changes on sediment yield reduction in the catchment were quantified. The results showed that (i) grassland and slope farmland were the main land use types in the catchment, and a decrease of the slope farmland area and an increase of the vegetation coverage occurred from 1964 to 2018; (ii) compared with 1964, most parts of the catchment in 2004 and 2018 had an overall lower connectivity index (IC); (iii) the distribution of sediment connectivity presented obvious spatial variability. The hill slopes and tributary gullies tended to be relatively well connected, and the main gully was highly disconnected. Scenario simulations showed that the potential sediment reduction effect was 20% 45% for vegetation, and <10% for terraces or dam lands in 1964, 2004, and 2018. The effect of impounding sediment by check dams was not included in IC calculation in this study, and it was found that the sediment impounded by these dams accounted for about 16% of sediment discharge reduction during 1995-2004 and 1% during 2005-2018. The IC reduction was responsible for 84% of the decrease of sediment discharge during 1995-2004 and 99% during 2005-2018, reflecting that vegetation restoration and terrace construction on slopes has become the main drivers for reducing IC value and sediment yield.
资助项目	National Natural Science Foundation of China[41971008] ; National Natural Science Foundation of China[41671004]
WOS关键词	VEGETATION COVER ; HOWGILL-FELLS ; SOIL-EROSION ; DELIVERY ; LANDSCAPE ; RIVER ; TOPOGRAPHY ; RUNOFF ; SPACE ; AREAS
WOS研究方向	Geology ; Agriculture ; Water Resources
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000703268900103
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/165985]
专题	中国科学院地理科学与资源研究所
通讯作者	Shi, Changxing
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Key Lab Water Cycle & Related Land Surface Proc, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 3.Xian Univ Technol, State Key Lab Ecohydraul Northwest Arid Reg China, 5 Jinhua Rd, Xian 710048, Peoples R China
推荐引用方式 GB/T 7714	Liu, Wei,Shi, Changxing,Ma, Yongyong,et al. Land use and land cover change-induced changes of sediment connectivity and their effects on sediment yield in a catchment on the Loess Plateau in China[J]. CATENA,2021,207:11.
APA	Liu, Wei,Shi, Changxing,Ma, Yongyong,Li, Huijuan,&Ma, Xiaoqing.(2021).Land use and land cover change-induced changes of sediment connectivity and their effects on sediment yield in a catchment on the Loess Plateau in China.CATENA,207,11.
MLA	Liu, Wei,et al."Land use and land cover change-induced changes of sediment connectivity and their effects on sediment yield in a catchment on the Loess Plateau in China".CATENA 207(2021):11.