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Climatic significance of the stable carbon isotopic composition of surface soils in northern Iran and its application to an Early Pleistocene loess section
Wang, Q (Wang, Qiang)1; Wang, X (Wang, Xin)1; Wei, HT (Wei, Haitao)1; Khormali, F (Khormali, Farhad)3; Xie, HC (Xie, Haichao)1; Zhang, JH (Zhang, Jinhui)1; Chen, FH (Chen, Fahu)1,2
Source PublicationORGANIC GEOCHEMISTRY
2019
Volume127Issue:0Pages:104-114
DOI10.1016/j.orggeochem.2018.11.011
Abstract

The stable carbon isotopic composition of bulk organic matter (delta C-13(org)) in paleosols has been widely used as a proxy indicator for reconstructing past vegetation and climate. Previous studies generally show a negative correlation between the delta C-13(org) values of modern C-3 plants and surface soils under C-3 plant-dominated ecosystems and mean annual precipitation (MAP). However, the relationship between delta(13)Corg and MAP varies among different climatic regimes, resulting in uncertainties in paleoprecipitation reconstructions. In this study, we analyzed the delta C-13(org) values of surface soil samples collected along a north-south climatic gradient in northern Iran, in the western part of arid central Asia (ACA). Our aims were to explore the relationship between surface soil delta C-13(org) values and climatic factors; to use it to develop a transfer function for ACA; and then to apply the transfer function to a well-dated loess-paleosol sequence (AB1) to reconstruct early Pleistocene (2.4-1.8 Ma) MAP in northern Iran. The results show that: (1) the delta C-13(org) values of 44 surface soil samples range from -27.56%, to -23.61%,, with an average of -25.77%,, indicating that the modern natural ecosystem in northern Iran is dominated by C-3 vegetation; (2) The delta C-13(org) values of the surface soil samples are strongly negatively correlated with MAP (y = -0.0079x - 22.8418, R-2 = 0.4419, p < 0.001), with a coefficient of -0.79%/100 mm. We infer that the effects of mean annual temperature (MAT) and elevation on the relationship are minimal; (3) Reconstructed early Pleistocene MAP in northern Iran was similar to 649 mm, much wetter than the present day (similar to 331 mm); (4) The loess delta C-13(org) values from ACA exhibit similar trends to records from monsoonal Asia, suggesting a similar history of Quaternary climate change between ACA and monsoonal Asia, which is likely related to the growth and decay of Northern Hemisphere ice sheets. (C) 2018 Elsevier Ltd. All rights reserved.

Subject AreaGeosciences
WOS IDWOS:000454881700009
Language英语
Indexed BySCI
KeywordArid Central-asia Mean Annual Precipitation Water-use Efficiency Organic-matter Rainfall Gradient C-4 Plants Relative Abundance Delta C-13 Plateau Discrimination
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
Cooperation Status国际
ISSN0146-6380
Department高寒生态与人类适应
URL查看原文
PublisherPERGAMON-ELSEVIER SCIENCE LTD
SubtypeArticle
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9459
Collection图书馆
Corresponding AuthorWang, X (Wang, Xin); Wei, HT (Wei, Haitao)
Affiliation1.Lanzhou Univ, Coll Earth & Environm Sci, Minist Educ, Key Lab Western Chinas Environm Syst, Lanzhou 730000, Gansu, Peoples R China;
2.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol & Biodivers LAEB, Beijing 100101, Peoples R China;
3.Gorgan Univ Agr Sci & Nat Resources, Fac Water & Soil Engn, Dept Soil Sci, Gorgan, Iran.
Recommended Citation
GB/T 7714
Wang, Q ,Wang, X ,Wei, HT ,et al. Climatic significance of the stable carbon isotopic composition of surface soils in northern Iran and its application to an Early Pleistocene loess section[J]. ORGANIC GEOCHEMISTRY,2019,127(0):104-114.
APA Wang, Q .,Wang, X .,Wei, HT .,Khormali, F .,Xie, HC .,...&Chen, FH .(2019).Climatic significance of the stable carbon isotopic composition of surface soils in northern Iran and its application to an Early Pleistocene loess section.ORGANIC GEOCHEMISTRY,127(0),104-114.
MLA Wang, Q ,et al."Climatic significance of the stable carbon isotopic composition of surface soils in northern Iran and its application to an Early Pleistocene loess section".ORGANIC GEOCHEMISTRY 127.0(2019):104-114.
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