Soil nitrogen isotopic composition of the Xifeng loess-paleosol sequence and its potential for use as a paleoenvironmental proxy

doi:10.1016/j.quaint.2016.04.018

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	Soil nitrogen isotopic composition of the Xifeng loess-paleosol sequence and its potential for use as a paleoenvironmental proxy
	Liu, Junchi 1,2; Liu, Weiguo 1,3
	2017-06-08
发表期刊	QUATERNARY INTERNATIONAL
卷号	440 期号:PtA 页码:35-41
文章类型	Article
摘要	The isotopic composition of soil nitrogen (soil delta N-15 values) has been widely used to explore the soil biogeochemical cycle and study land vegetation conditions. However, the delta N-15 values in the loess-paleosol sequence have not been thoroughly studied. In this study, we provide the first report of delta N-15 values from the Xifeng loess-paleosol profile, which spans the last 130 ka. The delta N-15 values show great variation (2.1 parts per thousand-6.1 parts per thousand) in the Xifeng loess sequence. According to these results, the delta N-15 values have a similar pattern with changes in the magnetic susceptibility (MS) and exhibit significant differences within the glacial-interglacial cycle over the last 130 ka. We hypothesize that climate conditions and land vegetation conversion could be reflected by the changes in the delta N-15 values within the glacial-interglacial cycle. (1) The delta N-15 values are positively correlated with the reconstructed mean annual temperature (MAT) and mean annual precipitation (MAP) on the glacial-interglacial time scale. Moreover, it appears that the MAT may be more effective than the MAP for the delta N-15 changes in the Xifeng loess-paleosol sequence. (2) Vegetation changing from grasses to shrubs may cause N-15 depletion during the glacial period. In addition, increasing grass groups may cause N-15 enrichment of the soil during the interglacial stage in the Xifeng loess-paleosol sequence. Because nitrogen is one of the most significant nutrient elements for vegetation, paleovegetation changes may be the main controlling factor for delta N-15 values in the loess-paleosol section. Therefore, delta N-15 values have the potential for use as a proxy in paleoenvironmental reconstructions of the Chinese Loess Plateau. (C) 2016 Elsevier Ltd and INQUA. All rights reserved.
关键词	Nitrogen Isotope Paleoenvironment Loess-paleosol Sequence Glacial-interglacial Cycle Chinese Loess Plateau
WOS标题词	Science & Technology ; Physical Sciences
DOI	10.1016/j.quaint.2016.04.018
关键词[WOS]	LAST GLACIAL MAXIMUM ; N-15 NATURAL-ABUNDANCE ; CHINESE LOESS ; ORGANIC-MATTER ; LEAF WAXES ; MONSOON PRECIPITATION ; PEDOGENIC CARBONATE ; PLANT ABUNDANCE ; SOUTHERN CHINA ; NORTHERN CHINA
收录类别	SCI
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000404315300004
引用统计	被引频次：10[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/5442
专题	加速器质谱中心
作者单位	1.Chinese Acad Sci, IEE, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Xi An Jiao Tong Univ, Sch Human Settlement & Civil Engn, Xian 710049, Peoples R China
推荐引用方式 GB/T 7714	Liu, Junchi,Liu, Weiguo. Soil nitrogen isotopic composition of the Xifeng loess-paleosol sequence and its potential for use as a paleoenvironmental proxy[J]. QUATERNARY INTERNATIONAL,2017,440(PtA):35-41.
APA	Liu, Junchi,&Liu, Weiguo.(2017).Soil nitrogen isotopic composition of the Xifeng loess-paleosol sequence and its potential for use as a paleoenvironmental proxy.QUATERNARY INTERNATIONAL,440(PtA),35-41.
MLA	Liu, Junchi,et al."Soil nitrogen isotopic composition of the Xifeng loess-paleosol sequence and its potential for use as a paleoenvironmental proxy".QUATERNARY INTERNATIONAL 440.PtA(2017):35-41.

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