Channel erosion dominates sediment sources in an agricultural catchment in the Upper Yangtze basin of China: Evidence from geochemical fingerprints
文献类型：期刊论文
| 作者 | Shi, Zhonglin1 ; Blake, William H.2; Wen, Anbang1; Chen, Jiacun1,3; Yan, Dongchun1; Long, Yi1
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| 刊名 | CATENA
 |
| 出版日期 | 2021-04-01 |
| 卷号 | 199页码:14 |
| 关键词 | Sediment tracing Geochemical fingerprinting Soil conservation Sediment sources Channel erosion Particle size |
| ISSN号 | 0341-8162 |
| DOI | 10.1016/j.catena.2020.105111 |
| 通讯作者 | Shi, Zhonglin(shizl@imde.ac.cn) ; Wen, Anbang(wabang@imde.ac.cn) |
| 英文摘要 | A 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. |
| WOS关键词 | FLUVIAL SUSPENDED SEDIMENT ; PARTICLE-SIZE ; RIVER BASIN ; WATERSHEDS ; CONTAMINANTS ; TRIBUTARIES ; QUEENSLAND ; CHALLENGES ; KNOWLEDGE ; SELECTION |
| 资助项目 | National Basic Research Program of China[2015CB452704] |
| WOS研究方向 | Geology ; Agriculture ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000608022600026 |
| 出版者 | ELSEVIER |
| 资助机构 | National Basic Research Program of China |
| 源URL | [http://ir.imde.ac.cn/handle/131551/55844]  |
| 专题 | 科技与合作处 成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室 |
| 通讯作者 | Shi, Zhonglin; Wen, Anbang |
| 作者单位 | 1.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 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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