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Channel erosion dominates sediment sources in an agricultural catchment in the Upper Yangtze basin of China: Evidence from geochemical fingerprints
Shi, Zhonglin1; Blake, William H.2; Wen, Anbang1; Chen, Jiacun1,3; Yan, Dongchun1; Long, Yi1
2021-04-01
Source PublicationCATENA
ISSN0341-8162
Volume199Pages:14
AbstractA sediment fingerprinting approach was applied to identify dominant sediment sources in an area where soil conservation measures (i.e. terracing) had been carried out on steep, intensively cultivated lands but the outcome was unknown. The wider purpose was to provide scientific evidence to inform decisions on where erosion control and sediment mitigation strategies could be further targeted. Geochemical fingerprints were used to quantify sediment contributions from three potential sources, i.e. surface soil under cropland and woodland land use, and channel banks, in a managed small catchment in the Upper Yangtze River basin in southwestern China. In parallel, artificial mixtures with known source proportions were evaluated to examine the effects of grain size selection (<125 mu m and < 63 mu m) on the accuracy of modeled source contributions. Source apportionment results suggest that materials originating from incised and actively eroding channel banks were the most important source of sediment, which contribute over 80% of sediment to the catchment outlet. Sediment inputs from cropland (10-20%) and woodland (<10%) areas as a result of surface erosion were less important, since effective soil conservation measures have been implemented in this catchment. Although apportionment of sampled sediment provided comparable results for both coarser (<125 mu m) and fine (<63 mu m) size fractions, the artificial mixture results indicated that unmixing the coarse fraction alone could yield poor agreement between modeled source contributions and actual source proportions. The mean absolute error (MAE) for the coarse fraction mixtures ranged between 8.8% and 19.6%, with a mean of 13.6%, compared to the values of 4.0-7.4%, with a mean of 5.2% for the fine fractions. The results of this study highlight that channel bank materials constitute a significant fraction of suspended sediment exports in a heavily managed agricultural catchment, suggesting that future conservation works should be focused on drivers of erosion from this particular source type. Herein, it is surmised that reworking of legacy valley fill deposits is tempering the downstream benefits (e.g. reduced siltation) of recent upslope soil conservation, an important message for policy makers. The findings of this work also emphasize the methodological need to take account of potential uncertainties associate with source apportionments when using specific particle size fractions in fingerprinting studies.
KeywordSediment tracing Geochemical fingerprinting Soil conservation Sediment sources Channel erosion Particle size
DOI10.1016/j.catena.2020.105111
Indexed BySCI
WOS KeywordFLUVIAL SUSPENDED SEDIMENT ; PARTICLE-SIZE ; RIVER BASIN ; WATERSHEDS ; CONTAMINANTS ; TRIBUTARIES ; QUEENSLAND ; CHALLENGES ; KNOWLEDGE ; SELECTION
Language英语
Funding ProjectNational Basic Research Program of China[2015CB452704]
TOP
WOS Research AreaGeology ; Agriculture ; Water Resources
WOS SubjectGeosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS IDWOS:000608022600026
Funding OrganizationNational Basic Research Program of China
PublisherELSEVIER
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/55845
Collection科技与合作处
山地表生过程与生态调控重点实验室
Corresponding AuthorShi, Zhonglin; Wen, Anbang
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
2.Univ Plymouth, Sch Geog Earth & Environm Sci, Plymouth PL4 8AA, Devon, England
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Corresponding Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Shi, Zhonglin,Blake, William H.,Wen, Anbang,et al. Channel erosion dominates sediment sources in an agricultural catchment in the Upper Yangtze basin of China: Evidence from geochemical fingerprints[J]. CATENA,2021,199:14.
APA Shi, Zhonglin,Blake, William H.,Wen, Anbang,Chen, Jiacun,Yan, Dongchun,&Long, Yi.(2021).Channel erosion dominates sediment sources in an agricultural catchment in the Upper Yangtze basin of China: Evidence from geochemical fingerprints.CATENA,199,14.
MLA Shi, Zhonglin,et al."Channel erosion dominates sediment sources in an agricultural catchment in the Upper Yangtze basin of China: Evidence from geochemical fingerprints".CATENA 199(2021):14.
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