| Variation of soil Δδ13C values in Xifeng loess-paleosol sequence and its paleoenvironmental implication |
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| 作者姓名： | NING Youfeng LIU Weiguo AN Zhisheng |
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| 作者单位： | [1]State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi＇an 710075, China; [2]Graduate School of Chinese Academy of Sciences, Beijing 100039,China [3]College of Energy and Power Engineering, Xi＇an Jiaotong University. Xi＇an 710049, China |
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| 摘 要： | The carbon isotopic compositions of soil organic matter （SOM） and total carbonate （TC） in Xifeng Ioess-paleosol sequence have been studied. The δ^13CsoM values vary from -23.8‰ to -20.2‰, which are higher in interglacial than in glacial stages. Contrary to δ^13Csoi values, the δ^13CTc values vary from -8.5‰ to -3.6‰ and are lower in interglacial than in glacial stages. The differences （△δ^13C） between the δ^13CsoM and δ^13CTc values vary from 14.1‰ to 19.4‰. Our results from the Xifeng loesspaleosol sequence indicate that the △δ^13C values represent the ratio of primary carbonate （PC） to secondary carbonate （SC）. The △δ^13C values were high in the loess stages, and the maximal PC-to-SC ratio can reach 6：4. But in the paleosol stages, the △δ^13C values were low, with a small proportion of PC. The △δ^13C values in Ioess-paleosol sequence also indicate the contributions of the dust to the loess sediment in the Chinese Loess Plateau because the dust contains the PC.
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| 关 键 词： | 黄土 古土壤 有机碳 碳酸盐 碳同位素 |
| 收稿时间： | 2006-01-20 |
| 修稿时间： | 2006-01-202006-03-30 |
Variation of soil Δδ
13C values in Xifeng loess-paleosol sequence and its paleoenvironmental implication |
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| NING Youfeng LIU Weiguo AN Zhisheng.Variation of soil Δδ
13C values in Xifeng loess-paleosol sequence and its paleoenvironmental implication[J].Chinese Science Bulletin,2006,51(11):1350-1354. |
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| Authors: | Youfeng Ning Weiguo Liu Zhisheng An |
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| Affiliation: | (1) State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710075, China;(2) Graduate School of Chinese Academy of Sciences, Beijing, 100039, China;(3) College of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, 710049, China |
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| Abstract: | The carbon isotopic compositions of soil organic matter (SOM) and total carbonate (TC) in Xifeng loess-paleosol sequence have
been studied. The δ
13CSOM values vary from −23.8‰ to −20.2‰, which are higher in interglacial than in glacial stages. Contrary to δ
13CSOM values, the δ
13CTC values vary from −8.5‰ to −3.6‰ and are lower in interglacial than in glacial stages. The differences (Δδ
13C) between the δ
13CSOM and δ
13CTC values vary from 14.1‰ to 19.4‰. Our results from the Xifeng loess-paleosol sequence indicate that the Δδ
13C values represent the ratio of primary carbonate (PC) to secondary carbonate (SC). The Δδ
13C values were high in the loess stages, and the maximal PC-to-SC ratio can reach 6:4. But in the paleosol stages, the Δδ
13C values were low, with a small proportion of PC. The Δδ
13C values in loess-paleosol sequence also indicate the contributions of the dust to the loess sediment in the Chinese Loess
Plateau because the dust contains the PC. |
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| Keywords: | loess-paleosol organic carbon carbonate carbon isotope |
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