Quantifying sediment source contributions in an agricultural catchment with ephemeral and classic gullies using Cs-137 technique

doi:10.1016/j.geoderma.2021.115112

	Quantifying sediment source contributions in an agricultural catchment with ephemeral and classic gullies using Cs-137 technique
	Chen, Hong 2; Liu, Gang 2,3; Zhang, Xunchang 1; Shi, Hongqiang 2; Li, Hairu 2
刊名	GEODERMA
	2021-09-15
卷号	398 页码:9
关键词	Sediment source Cesium-137 Mollisol Suspended sediment Deposited sediment Gully erosion
ISSN号	0016-7061
DOI	10.1016/j.geoderma.2021.115112
通讯作者	Liu, Gang(gliu@foxmail.com)
英文摘要	Soil loss caused gully erosion can be substantial in agricultural catchments in the Mollisol region of northeast China. However, their contributions to total soil loss have never been quantified systematically at various spatial scales. Here we selected an agricultural catchment with ephemeral and classic gullies in Keshan county, Heilongjiang province. The fallout Cs-137 activity adjusted to fine fraction of < 63 mu m was employed as tracer to quantify the contribution of fine sediment eroded from topsoil and subsoil (gully bank) in the whole catchment and each sub-catchment by using a linear mixing model. The results showed that the coefficient of variations (CVs) of Cs-137 activity for subsoil, ranging from 86.4 to 166.1%, were greater than those of topsoil varying from 18.2 to 39.9%. In topsoil, cropland had the greatest Cs-137 concentration in both < 1 mm and < 63 mu m fractions, followed by forestland and road. Although the Cs-137 activity varied greatly in sources, the contrasting concentrations between sources render Cs-137 an effective tracer for distinguishing topsoil and subsoil contributions to sediment discharge. The allocated proportions of both deposited (bed) and suspended (trap) sediment with different particle sizes showed the eroded fine sediment (<63 mu m fraction) of the catchment mainly came from gully bank, accounting for about 90%, but the significant difference of apportionment between deposited and suspended sediment was obtained in some catchments, indicating that caution must be exercised when taking deposited sediment out of bed materials. The result for suspended sediment showed contributions of subsoil in catchment with classic gullies were greater than those with ephemeral gullies, and the gully head and bank were the primary sediment sources. This study provided valuable quantitative information of sediment sources for agricultural catchments with both ephemeral and classic gullies, and suggested soil conservation measures be concentrated on stabilizing gullies, especially controlling gully head advance.
资助项目	National Key R&D Program of China[2016YFE0202900] ; Natural Science Foundation of China[41761144060] ; International Partnership Program of Chinese Academy of Sciences[161461KYSB20170013] ; Natural Science Basic Research Plan in Shaanxi Province of China[2020JM-163]
WOS关键词	BLACK SOIL REGION ; SPATIAL VARIABILITY ; EROSION ; RIVER ; UNCERTAINTY ; CESIUM-137 ; MANAGEMENT ; ACCURACY ; ENGLAND ; IMPACT
WOS研究方向	Agriculture
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000656899400007
资助机构	National Key R&D Program of China ; Natural Science Foundation of China ; International Partnership Program of Chinese Academy of Sciences ; Natural Science Basic Research Plan in Shaanxi Province of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/163985]
专题	中国科学院地理科学与资源研究所
通讯作者	Liu, Gang
作者单位	1.USDA ARS, Grazinglands Res Lab, 7207 W Cheyenne St, El Reno, OK 73036 USA 2.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 3.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Chen, Hong,Liu, Gang,Zhang, Xunchang,et al. Quantifying sediment source contributions in an agricultural catchment with ephemeral and classic gullies using Cs-137 technique[J]. GEODERMA,2021,398:9.
APA	Chen, Hong,Liu, Gang,Zhang, Xunchang,Shi, Hongqiang,&Li, Hairu.(2021).Quantifying sediment source contributions in an agricultural catchment with ephemeral and classic gullies using Cs-137 technique.GEODERMA,398,9.
MLA	Chen, Hong,et al."Quantifying sediment source contributions in an agricultural catchment with ephemeral and classic gullies using Cs-137 technique".GEODERMA 398(2021):9.