| 中更新世以来哈尔滨黄土有机碳同位素组成及其古气候意义 |
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| 关键词:Harbin organic carbon isotope composition C3 vegetation temperature precipitation |
| 基金项目:国家自然科学基金项目(编号: 41601200; 41871013);黑龙江省自然科学基金项目(编号: D2017003);哈尔滨师范大学博士科研启动基金项目(编号: XKB201418) |
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| Organic Carbon Isotope Composition of Harbin Loess since the Mid-Pleistocene and Its Paleoclimatic Significance |
| The research on the relationship between organic carbon isotope composition of loess-paleosol sequence and paleo-vegetation as well as paleoclimate has great significance for the reconstruction of Quaternary environmental change process. However, the research on the organic carbon isotope composition of Harbin loess in Northeast China has not been carried out. In this paper, the authors analyzed the organic carbon isotope composition and magnetic susceptibility of the loess-paleosol sequence of Harbin Huangshan core. The results show that the average organic carbon isotopic compositions in the paleosol and loess layer since the Middle Pleistocene are –24.8 ‰ and –25.1 ‰, respectively. On the whole, the organic carbon isotope composition of the paleosol layer is more positive than that of the loess layer, while the values of S0 and S2 paleosol layers are relatively negative. The relative abundance of C3/C4 plants in the past was restored by the end element method, which has revealed that C3 plants have been dominant in the study area since the Middle Pleistocene. Through the coupling comparison with sea surface temperature, deep-sea oxygen isotope and organic carbon isotope of Chifeng loess in Northeast China, it is found that the change of organic carbon isotope composition in Huangshan core is positively correlated with temperature, indicating that temperature is the main controlling factor of the change of plant carbon isotope composition. However, during some interglacial periods, such as the S0, S2 paleosol layer and the middle of S3 paleosol layer, precipitation may be a major factor. The above study shows that the response of plant growth to climate in Northeast China is complex. The understanding obtained by the authors has important reference significance for the growth factors of C3 plants in Harbin. |
| ZHANG Yue-xin,CHI Yun-ping,XIE Yuan-yun,KANG Chun-guo,WU Peng,WEI Zhen-yu,ZHANG Man,LIU Lu.2020.Organic Carbon Isotope Composition of Harbin Loess since the Mid-Pleistocene and Its Paleoclimatic Significance[J].Acta Geoscientica Sinica,41(4):525-534. |
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