Check dam infilling archives elucidate historical sedimentary dynamics in a semiarid landscape of the Loess Plateau, China
Tang Qiang1,2; Wang Yafeng2; Gao Guanngyao2
第一作者单位中国科学院水利部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
通讯作者单位中国科学院水利部成都山地灾害与环境研究所
2018-05-10
发表期刊Ecological Engineering
ISSN0925-8574
期号118页码:161-170
产权排序1
摘要

The Loess Plateau in China exhibited high magnitudes of soil erosion, where multiple soil conservation schemes have been implemented over the past decades. Understanding the efficacy and rationality of conservation practices on erosion mitigation is critical for contemporary strategy adjustment, which currently is hampered by the unavailability of historical observations on sediment yields at most ungauged catchments. Check dams were built with the primary purpose of sediment retention, while the infilling archives register historical sedimentary dynamics. A 485-cm long sediment core was extracted from a check dam in a restored agricultural catchment in the hilly Loess Plateau. Sedimentary stratigraphy was defined at 5-cm resolutions by continuous equivalent sectioning, and differentiated according to absolute grain-size composition and Cesium-137 (137Cs) profile. Discernable stratigraphic laminations, featured by a fine-grained layer overlying on a coarse-grained layer, were observed, which were conducted by particle selectivity associated with soil detachment and sediment transport processes. Erosion and sediment dynamics across this semiarid landscape is strictly defined by extreme summer storms with large magnitude, low frequency and short duration. Sediment chronology was determined by ascribing the identified laminations to historical storm events. We found that the core profile showed evidence of at least 11 depositional events, which finally were connected with 11 major storms over the time period 1981–1983. We concluded that integrating stratigraphy differentiation of equivalent core segments along depositional profiles with storm records is diagnostic for inferring historical sedimentary dynamics.

关键词Sedimentary Dynamics Stratigraphy Differentiation Sediment Chronology Ecological Restoration Check Dam Loess Plateau
学科门类理学::地理学
收录类别SCI
语种英语
期刊分区3区
TOP期刊
文献类型期刊论文
条目标识符http://ir.imde.ac.cn/handle/131551/21469
专题山地表生过程与生态调控重点实验室
作者单位1.Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
2.State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
3.State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
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Tang Qiang,Wang Yafeng,Gao Guanngyao. Check dam infilling archives elucidate historical sedimentary dynamics in a semiarid landscape of the Loess Plateau, China[J]. Ecological Engineering,2018(118):161-170.
APA Tang Qiang,Wang Yafeng,&Gao Guanngyao.(2018).Check dam infilling archives elucidate historical sedimentary dynamics in a semiarid landscape of the Loess Plateau, China.Ecological Engineering(118),161-170.
MLA Tang Qiang,et al."Check dam infilling archives elucidate historical sedimentary dynamics in a semiarid landscape of the Loess Plateau, China".Ecological Engineering .118(2018):161-170.
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