|
|||||
|
|
| 黄土有机质稳定碳同位素研究进展 | |
| 引用本文： | 饶志国,朱照宇,陈发虎,张家武.黄土有机质稳定碳同位素研究进展[J].地球科学进展,2006,21(1):62-69. |
| 作者姓名： | 饶志国 朱照宇 陈发虎 张家武 |
| 作者单位： | 1. 中国科学院广州地球化学研究所与南海海洋研究所边缘海地质重点实验室,广东,广州,510640;兰州大学资源环境学院西部环境教育部重点实验室中德干旱环境联合研究中心,甘肃,兰州,730000;中国科学院研究生院,北京,100039 2. 中国科学院广州地球化学研究所与南海海洋研究所边缘海地质重点实验室,广东,广州,510640 3. 兰州大学资源环境学院西部环境教育部重点实验室中德干旱环境联合研究中心,甘肃,兰州,730000 |
| 基金项目： | 国家自然科学基金;科技部国际合作重点项目;中国科学院知识创新工程项目 |
| 摘 要： | 有关黄土高原历史时期原生植被类型的研究不仅具有重要的理论意义，也具有现实的指导意义。土壤有机质稳定碳同位素（δ13Corg）是区域植被中C4/C3植物相对丰度的灵敏指示器，对黄土有机质稳定碳同位素的研究可以部分地重建过去的植被类型变化历史，并可探讨与此有关的气候、环境问题。已有的研究结果表明：黄土高原古土壤发育阶段δ13Corg偏正于黄土沉积阶段，表明随气候由冷干向暖湿转变黄土高原C4植物相对丰度上升，然而在C4植物相对丰度上升的主要驱动因素上仍存在夏季风和温度两种观点。相应的在空间上，C4植物的相对丰度无论冰期还是间冰期都是由黄土高原东南向西北递减。而基于黄土δ13Corg的研究认为黄土高原历史时期一直以草原为主，不存在大面积的森林。尽管已有的研究对黄土有机质稳定碳同位素分布和变化的一般性规律取得了共识，但在研究中还存在一些问题，在黄土δ13Corg变化机制上还存在争议，值得进一步研究。 |
| 关 键 词： | 黄土 土壤有机质 稳定碳同位素 C4/C3植物 夏季风 温度 |
| 文章编号： | 1001-8166（2006）01-0062-08 |
| 收稿时间： | 2005-04-12 |
| 修稿时间： | 2005-08-02 |
Reviews on the Stable Carbon Isotopic Researches of Organic Matter of Chinese Loess |
|
| RAO Zhi-guo,ZHU Zhao-yu,CHEN Fa-hu,ZHANG Jia-wu.Reviews on the Stable Carbon Isotopic Researches of Organic Matter of Chinese Loess[J].Advance in Earth Sciences,2006,21(1):62-69. | |
| Authors: | RAO Zhi-guo ZHU Zhao-yu CHEN Fa-hu ZHANG Jia-wu |
| Institution: | 1.Key Laboratory of Marginal Sea Geology, Guangzhou Insitutute of Geochemistry and South China Sea Institute of Oceanology, Chinese Academy of Sciences,Guangzhou 510640, China; 2. Sino-German Center for Arid Environment and Paleoclimate Research, Key Laboratory of Western China's Environment Systems,Ministry of Education, College of Resources and Environment, Lanzhou University, Lanzhou 730000, China;3. Graduate School of Chinese Academy of Sciences, Beijing 100039, China |
| Abstract: | Soil stable organic carbon isotopic composition (δ13Corg) is a sensitive indicator of relative abundance of local C4/C3 plants due to the distinct distribution range of their δ13Corg and has little or no isotopic fractionation during bury and decompound process of plants. Chinese Loess Plateau (CLP), located in the northwest inner continent, is a sensitive area to climatic and environmental change and weak change of climate and environment can result in strong landscape change. So, the research on δ13Corg of Chinese loess can partly reconstruct paleovegetation type, and furthermore, indicate the relationships between climate and environment related to paleovegetation. Reviews on δ13Corg studies of Chinese loess showed: δ13Corg of Chinese loess more positive in paleosols developed during warm and moist interglacials and more positive southeastward in both paleosols and loess. The available δ13Corg data indicate the proportion of C4 plants increasing form glacial to interglacial and from the northwestern part to southeastern part of CLP. The past vegetation type of CLP determined as grassland still lack direct evidences because of all trees are also use C3 photosynthesis pathway. The key control environmental factors on C4 plants, such as temperature and Asian Summer Monsoon are still debated. Although the general rule of the distribution of Chinese loess δ13Corgis clear in both temporal and spatial sequence, some other problems including the control mechanism on Chinese loess δ13Corg are still blurry. Further understanding of Chinese loess δ13Corg needs more research work. |
| Keywords: | Chinese Loess Soil organic matter Stable carbon isotope C_(3)/C_(4) plants Summer monsoon Temperature |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ | |
| 点击此处可从《地球科学进展》浏览原始摘要信息 | |
| 点击此处可从《地球科学进展》下载免费的PDF全文 | |