ISSN 1006-3021 CN11-3474/P
Published bimonthly started in 1979
投稿时间:2019-11-25  修订日期:2020-03-29
关键词:Harbin  Organic carbon isotope composition  C 3 vegetation  Temperature  Precipitation
张月馨 哈尔滨师范大学地理科学学院 
迟云平 哈尔滨师范大学地理科学学院 
谢远云 哈尔滨师范大学寒区地理环境监测与空间信息服务黑龙江省重点实验室
康春国 哈尔滨师范大学寒区地理环境监测与空间信息服务黑龙江省重点实验室
吴鹏 哈尔滨师范大学地理科学学院  
魏振宇 哈尔滨师范大学地理科学学院  
张曼 哈尔滨师范大学地理科学学院  
刘璐 哈尔滨师范大学地理科学学院  
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Organic carbon isotope composition of Harbin loess since the mid-Pleistocene and its paleoclimatic significance
      Abstract: The research of the relationship between organic carbon isotopes composition of loess-paleosol sequence and paleo-vegetation and 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, we 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 ‰. On the whole, the organic carbon isotope composition of the paleosol layer is more positive than that of the loess layer, while the S0 and S2 paleosol layers are relatively negative. The relative abundance of C3/C4 plants in the past is restored by the end element method, which revealed that C3 plants are 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. These understandings have important reference significance for the growth factors of C3 plants in Harbin.
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