Different responses of sedimentary delta N-15 to climatic changes and anthropogenic impacts in lakes across the Eastern margin of the Tibetan Plateau

doi:10.1016/j.jseaes.2016.03.024

	Different responses of sedimentary delta N-15 to climatic changes and anthropogenic impacts in lakes across the Eastern margin of the Tibetan Plateau
	Sheng, Enguo 4; Xu, Hai 4; Yu, Keke 3,4; Lan, Jianghu 4; Liu, Bin 4; Ye, Yuanda 4; Hong, Bin 1; Wu, Huixian 3,4; Zhou, Kangen 3,4; Yeager, Kevin M.2
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2016-06-01
卷号	123 期号:2016 页码:111-118
关键词	Nitrogen Isotopes Tibetan Plateau Lacustrine Primary Productivity (Lpp) Atmospheric Nitrogen Deposition Lake Sediment
DOI	10.1016/j.jseaes.2016.03.024
文献子类	Article
英文摘要	Knowledge of historical variations in sedimentary delta N-15 values and their relation to modern ones in lakes is critical in understanding N cycling in inland aquatic systems. Here we present late Holocene sedimentary delta N-15 variations in four lakes across the Eastern margin of the Tibetan Plateau (ETP), namely Lake Qinghai and Lake Chaonaqiu over north ETP (N-ETP) area, and Lake Yihai and Lake Lugu over south ETP (S-ETP) area. The results show that: (1) during historical periods when anthropogenic forcing was weak, the centennialimulti-decadal changes in delta N-15 values were dominated by climatic changes. Higher precipitation brought greater nutrients supply and led to higher Lacustrine Primary Productivity (LPP) and higher delta N-15 values in lake sediments, and vice versa. (2) During the recent/modern epoch with enhanced anthropogenic impacts, sedimentary delta N-15 values in Lake Qinghai and Lake Chaonaqiu (mid-high latitude lakes with low LPP) showed decreasing trends, possibly related to the increased global atmospheric reactive nitrogen (Nr) deposition. On the contrary, sedimentary delta N-15 values in Lake Lugu and Lake Yihai (subtropical lakes with high LPP) showed increasing trends, most likely because more dissolved inorganic nitrogen in lake water was used during LPP processes. This study highlights that LPP plays an important role in modifying sedimentary delta N-15 values both for historical and modern times, whereas atmospheric Nr deposition seems to influence the modern/recent sedimentary delta N-15 trends in lakes with low LPP. (C) 2016 Elsevier Ltd. All rights reserved.
WOS关键词	STABLE-ISOTOPE RATIOS ; ORGANIC-MATTER ; NITROGEN DEPOSITION ; LATE HOLOCENE ; ALPINE LAKES ; TREE-RINGS ; LUGU LAKE ; QINGHAI ; CHINA ; CARBON
WOS研究方向	Geology
语种	英语
WOS记录号	WOS:000378462600012
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/5724]
专题	地球环境研究所_现代环境研究室
作者单位	1.Chinese Acad Sci, Inst Geochem, State key Lab Environm Geochem, Guiyang, Peoples R China 2.Univ Kentucky, Dept Earth & Environm Sci, Lexington, KY 40506 USA 3.Chinese Acad Sci, Grad Univ, Beijing, Peoples R China 4.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian, Peoples R China
推荐引用方式 GB/T 7714	Sheng, Enguo,Xu, Hai,Yu, Keke,et al. Different responses of sedimentary delta N-15 to climatic changes and anthropogenic impacts in lakes across the Eastern margin of the Tibetan Plateau[J]. JOURNAL OF ASIAN EARTH SCIENCES,2016,123(2016):111-118.
APA	Sheng, Enguo.,Xu, Hai.,Yu, Keke.,Lan, Jianghu.,Liu, Bin.,...&Yeager, Kevin M..(2016).Different responses of sedimentary delta N-15 to climatic changes and anthropogenic impacts in lakes across the Eastern margin of the Tibetan Plateau.JOURNAL OF ASIAN EARTH SCIENCES,123(2016),111-118.
MLA	Sheng, Enguo,et al."Different responses of sedimentary delta N-15 to climatic changes and anthropogenic impacts in lakes across the Eastern margin of the Tibetan Plateau".JOURNAL OF ASIAN EARTH SCIENCES 123.2016(2016):111-118.