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, Fan; Shi, Xiaonan; Zeng, Chen; Wang, Li; Xiao, Xiong; Wang, Guanxing; Chen, Yao; Zhang, Hongbo; Lu, Xixi; Immerzeel, Walter
通讯作者	Zhang, F ; Shi, XN (通讯作者)
发表日期	2020
ISSN	2095-9273
EISSN	2095-9281
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 Nino 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. (C) 2019 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
关键词	YANGTZE-RIVER SOURCE REGION ENVIRONMENTAL-CHANGES RUNOFF BASIN EROSIVITY TRENDS OCEAN LOAD
英文关键词	Alpine catchment; Sediment flux; Changing trend; Climate change
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000518396800012
来源期刊	SCIENCE BULLETIN
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260020
推荐引用方式 GB/T 7714	Zhang, Fan,Shi, Xiaonan,Zeng, Chen,et al. Recent stepwise sediment flux increase with climate change in the Tuotuo River in the central Tibetan Plateau[J]. 中国科学院青藏高原研究所,2020,65(5).
APA	Zhang, Fan.,Shi, Xiaonan.,Zeng, Chen.,Wang, Li.,Xiao, Xiong.,...&Immerzeel, Walter.(2020).Recent stepwise sediment flux increase with climate change in the Tuotuo River in the central Tibetan Plateau.SCIENCE BULLETIN,65(5).
MLA	Zhang, Fan,et al."Recent stepwise sediment flux increase with climate change in the Tuotuo River in the central Tibetan Plateau".SCIENCE BULLETIN 65.5(2020).