干旱区生态环境知识资源中心(Arid): Pedogenic carbonates archive modern and past precipitation change - A transect study from soils and loess-paleosol sequences from northern Iran

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DOI	10.1016/j.quaint.2019.12.011
	Pedogenic carbonates archive modern and past precipitation change - A transect study from soils and loess-paleosol sequences from northern Iran
	Khormali, Farhad; Shahriari, Ali; Ghafarpour, Amin; Kehl, Martin; Lehndorff, Eva; Frechen, Manfred
通讯作者	Khormali, F
来源期刊	QUATERNARY INTERNATIONAL
ISSN	1040-6182
EISSN	1873-4553
出版年	2020
卷号	552 页码:79-90
英文摘要	Stable carbon and oxygen isotope compositions in soil carbonates and in soil organic matter provide insights into (paleo) climatic conditions, especially in arid and semiarid regions where carbonate is abundant in soils. We here investigate delta C-13 and delta O-18 isotope composition of bulk carbonate, pedogenic carbonate nodules and organic carbon from modern soils developed along a precipitation gradient (Entisol, Inceptisol, Mollisol and Alfisol) and paleosols formed within loess units in northern Iran. delta C-13 values of organic carbon in the modern soils ranged from -19.5 parts per thousand in the arid and semiarid regions to -24 parts per thousand in the more humid regions with forest vegetation. delta C-13 values of bulk carbonate in the modern soils ranged from -12.1 parts per thousand at the wettest sites to -0.8 parts per thousand at the drier sites and thus, a 550 mm increase in precipitation leads to a similar to 11 parts per thousand decrease in delta C-13 values of bulk carbonate. In the modern soils, delta C-13 values of pedogenic carbonate nodules in the semiarid areas show higher values by similar to 3-4 parts per thousand more than the regions with forest vegetation. Unlike delta C-13 values of pedogenic carbonate nodules the delta O-18 values of pedogenic carbonate nodules of modern soils in this study did not display pronounced changes across the sections. The change in delta C-13 of carbonates and organic carbon is consistent with the present aboveground vegetation, consisting of a mosaic of habitats with differences in the proportion of C-3 and C-4 vegetation tending to larger C-4 contribution with increasing aridity. The delta C-13 values of carbonates coupled with climate data of the region confirm seasonal bias in the formation of carbonate nodules in the modern soils seen in studies elsewhere. The delta C-13 values of pedogenic carbonate nodules in the paleosols range from -10 parts per thousand in humid areas to -7.2 parts per thousand in semiarid areas. The trends in delta C-13 composition in modern soils are also visible in the delta C-13 composition in the paleosols, suggesting that in the foothills of the Alborz and Iranian loess plateau, a precipitation gradient existed also in the last interglacial.
英文关键词	Stable isotope carbon Loess-paleosols Pedogenic carbonate nodules (stageII) Iran
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000573017600001
WOS关键词	STABLE ISOTOPIC COMPOSITION ; WASHINGTON-STATE ; DELTA-C-13 VALUES ; VEGETATION CHANGE ; C-13-O-18 BONDS ; ATMOSPHERIC CO2 ; PALOUSE REGION ; ORGANIC-CARBON ; LATE MIOCENE ; C-4 GRASSES
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/2XILL650/326519
作者单位	[Khormali, Farhad; Ghafarpour, Amin] Gorgan Univ Agr Sci & Nat Resources, Dept Soil Sci, Fac Water & Soil Engn, Gorgan 4913815739, Golestan, Iran; [Shahriari, Ali] Univ Zabol, Fac Water & Soil, Dept Soil Sci, Zabol, Iran; [Kehl, Martin] Univ Cologne, Inst Geog, Albertus Magnus Pl, D-50923 Cologne, Germany; [Lehndorff, Eva] Bayreuth Univ, Bayreuth Ctr Ecol & Environm Res BayCEER, Dept Soil Ecol, Bayreuth, Germany; [Frechen, Manfred] Leibniz Inst Appl Geophys LIAG, Geochronol & Isotope Hydrol, Stilleweg 2, D-30655 Hannover, Germany
推荐引用方式 GB/T 7714	Khormali, Farhad,Shahriari, Ali,Ghafarpour, Amin,et al. Pedogenic carbonates archive modern and past precipitation change - A transect study from soils and loess-paleosol sequences from northern Iran[J],2020,552:79-90.
APA	Khormali, Farhad,Shahriari, Ali,Ghafarpour, Amin,Kehl, Martin,Lehndorff, Eva,&Frechen, Manfred.(2020).Pedogenic carbonates archive modern and past precipitation change - A transect study from soils and loess-paleosol sequences from northern Iran.QUATERNARY INTERNATIONAL,552,79-90.
MLA	Khormali, Farhad,et al."Pedogenic carbonates archive modern and past precipitation change - A transect study from soils and loess-paleosol sequences from northern Iran".QUATERNARY INTERNATIONAL 552(2020):79-90.