气候变化领域集成服务门户(CCPortal): Recent stepwise sediment flux increase with climate change in the Tuotuo River in the central Tibetan Plateau

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DOI	10.1016/j.scib.2019.12.017
	Recent stepwise sediment flux increase with climate change in the Tuotuo River in the central Tibetan Plateau
	Zhang F.; Shi X.; Zeng C.; Wang L.; Xiao X.; Wang G.; Chen Y.; Zhang H.; Lu X.; Immerzeel W.
发表日期	2020
ISSN	20959273
起始页码	410
结束页码	418
卷号	65 期号:5
英文摘要	The riverine sediment flux (SF) is an essential pathway for nutrients and pollutants delivery and considered as an important indicator of land degradation and environment changes. With growing interest in environmental changes over the Tibetan Plateau (TP), this work investigated the variation of the SF in response to climate change in the headwater of the Yangtze River over the past 30 years. Annual time series of hydro-meteorological variables during 1986–2014 indicate significantly increasing trends of air temperature, precipitation, ground temperature, river discharge, suspended sediment concentration and SF. Stepwise changes were identified with significantly higher values of the above variables in 1998–2014 compared with 1986–1997, which could potentially be attributed to the strong 1997 El Niño event. Double-mass plots indicated that both meltwater and rainfall contributed to the increased river discharge while the increased SF mostly resulted from enhanced erosive power and transport capacities of the increased discharge. However, it was buffered by a decrease in sediment source due to the shift of maximum monthly rainfall from June/July to July/August during which period a denser vegetation cover prevents soil erosion. Partial least squares structural equation modeling analysis confirmed the dominance of warming on the increase of discharge amplified by increased precipitation. It also confirmed that the increased precipitation drives the increase in suspended sediment concentration. Both processes conspire and equally contribute to the stepwise increase of SF. This study provides important insights into the controlling processes for recent SF changes and gives guidance for water and soil conservation on the TP. © 2019 Science China Press
关键词	Alpine catchment Changing trend Climate change Sediment flux
英文关键词	Atmospheric temperature; Catchments; Least squares approximations; Rain; Rivers; Sedimentation; Soil conservation; Suspended sediments; Water treatment; Alpine catchments; Changing trends; Meteorological variables; Partial least square (PLS); Sediment flux; Structural equation modeling; Suspended sediment concentrations; Water and soil conservations; Climate change
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207290
作者单位	Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China; Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing, 100101, China; College of Water Resources & Civil Engineering, China Agricultural University, Beijing, 100083, China; Department of Geography, National University of Singapore, Arts Link 1117570, Singapore; Department of Physical Geography, Utrecht University, Utrecht, 80115, Netherlands
推荐引用方式 GB/T 7714	Zhang F.,Shi X.,Zeng C.,et al. Recent stepwise sediment flux increase with climate change in the Tuotuo River in the central Tibetan Plateau[J],2020,65(5).
APA	Zhang F..,Shi X..,Zeng C..,Wang L..,Xiao X..,...&Immerzeel W..(2020).Recent stepwise sediment flux increase with climate change in the Tuotuo River in the central Tibetan Plateau.Science Bulletin,65(5).
MLA	Zhang F.,et al."Recent stepwise sediment flux increase with climate change in the Tuotuo River in the central Tibetan Plateau".Science Bulletin 65.5(2020).