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| 论文编号: |
27 |
| 论文题目: |
Soil nitrogen isotopic composition of the Xifeng loess-paleosol sequence and its potential for use as a paleoenvironmental proxy |
| 英文论文题目: |
Soil nitrogen isotopic composition of the Xifeng loess-paleosol sequence and its potential for use as a paleoenvironmental proxy |
| 第一作者: |
Liu, JC |
| 英文第一作者: |
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| 联系作者: |
Liu Weiguo |
| 英文联系作者: |
Liu Weiguo |
| 外单位作者单位: |
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| 发表年度: |
2017 |
| 卷: |
440 |
| 期: |
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| 页码: |
35-41 |
| 摘要: |
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| 英文摘要: |
The isotopic composition of soil nitrogen (soil delta N-15 values) has been widely used to explore the soil biogeochemical cycle and study land vegetation conditions. However, the delta N-15 values in the loess-paleosol sequence have not been thoroughly studied. In this study, we provide the first report of delta N-15 values from the Xifeng loess-paleosol profile, which spans the last 130 ka. The delta N-15 values show great variation (2.1 parts per thousand-6.1 parts per thousand) in the Xifeng loess sequence. According to these results, the delta N-15 values have a similar pattern with changes in the magnetic susceptibility (MS) and exhibit significant differences within the glacial-interglacial cycle over the last 130 ka. We hypothesize that climate conditions and land vegetation conversion could be reflected by the changes in the delta N-15 values within the glacial-interglacial cycle. (1) The delta N-15 values are positively correlated with the reconstructed mean annual temperature (MAT) and mean annual precipitation (MAP) on the glacial-interglacial time scale. Moreover, it appears that the MAT may be more effective than the MAP for the delta N-15 changes in the Xifeng loess-paleosol sequence. (2) Vegetation changing from grasses to shrubs may cause N-15 depletion during the glacial period. In addition, increasing grass groups may cause N-15 enrichment of the soil during the interglacial stage in the Xifeng loess-paleosol sequence. Because nitrogen is one of the most significant nutrient elements for vegetation, paleovegetation changes may be the main controlling factor for delta N-15 values in the loess-paleosol section. Therefore, delta N-15 values have the potential for use as a proxy in paleoenvironmental reconstructions of the Chinese Loess Plateau. |
| 刊物名称: |
QUATERNARY INTERNATIONAL |
| 英文刊物名称: |
QUATERNARY INTERNATIONAL |
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| 英文论文全文: |
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| 全文链接: |
http://www.sciencedirect.com/science/article/pii/S1040618215301129?via%3Dihub |
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