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Title of Journal: ChinSciBull

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Abbravation: Chinese Science Bulletin

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Science in China Press

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DOI

10.1002/anxi.3070010202

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1861-9541

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δSuperscript13/SuperscriptCSubscriptSC/Subs

Authors: Yumei Li Dongsheng Liu
Publish Date: 2013/08/30
Volume: 48, Issue: 9, Pages: 902-907
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Abstract

The carbon isotopic ratios of carbonate in the two profiles of the Dali area were analyzed and some new understandings on the influencing factors of the δ13CSC value of the loesspaleosol sequence and its paleoenvironmental implications were discussed preliminarily in this report The δ13CSC value of the Dali loesspaleosol sequence is synchronizing with the variance of magnetic susceptibility basically and the negative peaks of the δ13CSC curves are corresponding to the different developmental periods of the paleosol It is believed that the intervention of the CO2 produced by plants will cause the decrease of the δ13CSC value the amplitude of which may be relevant to the paleovegetation density and the ancient humidity The relative biomass of C4 plants in the vegetation will affect the sublevel change of the δ13CSC Low δ13CSC value by and large indicates the environmental conditions of the relatively abundant vegetation and humid climate During the last 250000 years the period with the sparsest vegetation and the most arid climate is the phase of the loess in L2 depositing and the period with the most abundant vegetation and the most humid climate is the last interglacial period The δ13CSC curves of Dali also show that the High Temperature and Large Precipitation Event of the QinghaiTibetan Plateau during 40–30 kaBP had affected the Central Shaanxi Plain with relatively humid climate and had apparent influence on the local vegetation and humidity

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