Arid
DOI10.1016/j.quaint.2016.02.048
Biomarkers in modern and buried soils of semi-desert and forest ecosystems of northern Iran
Shahriari, A.1; Khormali, F.1; Blaesing, M.2; Vlaminck, S.3; Kehl, M.3; Frechen, M.4; Karimi, A.5; Lehndorff, E.2
通讯作者Khormali, F.
来源期刊QUATERNARY INTERNATIONAL
ISSN1040-6182
EISSN1873-4553
出版年2017
卷号429页码:62-73
英文摘要

In Northern Iran mean annual precipitation and vegetation vary significantly over short distance from a semi-desert to a forest biome. These ecosystems likely responded differently on past climate changes. We here aim at i) testing the applicability of biomarkers (leave-derived n-alkanes, their stable carbon isotope composition, and C and N stable isotopes of soil organic matter) in loess-derived soils to identify and differentiate past ecosystems, and ii) elucidating the variability of these biomarkers in palaeosols. We sampled modern topsoils and palaeosol horizons within an ecological gradient covering a range in mean annual precipitation from 200 to 750 mm from the Kopet Dag semi-desert to the Hyrcanian forest on the footslopes of the Alborz Mountains. C-org, N, delta C-13(org), delta N-15, and n-alkanes (and their compound-specific delta C-13) were analyzed to characterize organic matter composition and sources. In modern soils a systematic increase in C-org and N was observed with precipitation. The delta N-15 decreased from about 6 to 4 parts per thousand pointing to systematically more degraded organic matter in semi-desert soils. The leave-wax specific ratio of (nC(31) + nC(33))/(nC(27) + nC(29))-n-alkanes was >1 for semi-desert soils and <1 for the forest ecosystem. The delta(1)3C(org) showed no systematic trend in this gradient. In loess and palaeosol profiles, contents of C-org, N and n-alkanes dropped about a factor 10 compared to modern soils. The n-alkane ratio and delta N-15 ratios remained on comparable levels as did the compound-specific delta C-13 in n-alkanes. However, bulk delta C-13(org) was altered from about -27 in modern soil to -23 parts per thousand in loess-palaeosols. Systematically higher C-org and N values were observed in palaeo-topsoils compared to loess and subsoil. Stable C isotopes varied rather unsystematically within loess-palaeosol sequences, while delta N-15 revealed trends within palaeosols, however, in contrasting directions with palaesol depth. The (temporal) average nalkane ratio for all palaeosol horizons of one site systematically followed the modern precipitation gradient indicating that in all periods of soil formation a climatic gradient developed. (C) 2016 Elsevier Ltd and INQUA. All rights reserved.


英文关键词Loess Palaeosol Biomarker n-alkanes Compound-specific stable isotope composition Palaeovegetation
类型Article
语种英语
国家Iran ; Germany
收录类别SCI-E
WOS记录号WOS:000397931400007
WOS关键词HOLOCENE VEGETATION HISTORY ; N-ALKANE BIOMARKERS ; LATE QUATERNARY ; ENVIRONMENTAL-CHANGES ; POLLEN RECORD ; CLIMATE ; RECONSTRUCTION ; SEQUENCE ; SEDIMENTS ; DYNAMICS
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/201782
作者单位1.Gorgan Univ Agr Sci & Nat Resources, Fac Water & Soil Engn, Dept Soil Sci, Gorgan 4913815739, Iran;
2.Univ Bonn, Inst Crop Sci & Resource Conservat INRES Soil Sci, Nussallee 13, D-53115 Bonn, Germany;
3.Univ Cologne, Inst Geog, Albertus Magnus Pl, D-50923 Cologne, Germany;
4.LIAG, Geochronol & Isotope Hydrol, Stilleweg 2, D-30655 Hannover, Germany;
5.Ferdowsi Univ Mashhad, Dept Soil Sci, Fac Agr, Mashhad, Iran
推荐引用方式
GB/T 7714
Shahriari, A.,Khormali, F.,Blaesing, M.,et al. Biomarkers in modern and buried soils of semi-desert and forest ecosystems of northern Iran[J],2017,429:62-73.
APA Shahriari, A..,Khormali, F..,Blaesing, M..,Vlaminck, S..,Kehl, M..,...&Lehndorff, E..(2017).Biomarkers in modern and buried soils of semi-desert and forest ecosystems of northern Iran.QUATERNARY INTERNATIONAL,429,62-73.
MLA Shahriari, A.,et al."Biomarkers in modern and buried soils of semi-desert and forest ecosystems of northern Iran".QUATERNARY INTERNATIONAL 429(2017):62-73.
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