| 引用本文: | 吴敬禄,王苏民,沈吉.湖泊沉积物有机质δ13C所揭示的环境气候信息.湖泊科学,1996,8(2):113-118. DOI:10.18307/1996.0204 |
| Wu Jinglu,Wang Sumin,Shen Ji.Informations of climate and environment deduced from the organic matter δ13C of lacustrine sediments. J. Lake Sci.1996,8(2):113-118. DOI:10.18307/1996.0204 |
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| 摘要: |
| 根据我国不同纬度和高海拔地区青藏高原东部地区湖泊沉积物有机质δ13C组成特征的分析,就其揭示的环境气候意义作了探讨。研究表明,湖泊沉积物有机质δ13C波动间接地反映气候冷暖的波动,但高原与平原地区湖泊沉积物有机质δ13C值变化具有不同的环境气候意义。这与陆生植物C3及C4植物的分布密切相关,据此初步划分为三种有机质δ13C古气候类型。 |
| 关键词: 湖泊沉积物 有机质δ13C 古气候 |
| DOI：10.18307/1996.0204 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目 |
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| Informations of climate and environment deduced from the organic matter δ13C of lacustrine sediments |
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Wu Jinglu, Wang Sumin, Shen Ji
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Lake Sediment and Environment Laboratory, Nanjing Institute of Geography & Limnology, CAS, Nanjing 210008
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| Abstract: |
| By analyzing the characteristics of the organic matter dliC in different-altitude and high-elevation (Qinghai-Xizang Plateau) lake sediments in China, the informations of climate deduced from the organic matter δ13C of the lake sediments are discussed.The results show that the organic matter δ13C content of lake sediments is to a certain degree correlative with climatic changes.In general, during colder climatic episodes, the δ13C values were lower, and higher during colder climatic episodes in the plateau region.Therefore, the variations of δ13C in lake sediments in plateau and plain areas have different climatic meanings.Further study shows that all of the aforementioned results have a close relation with the distributions of C3 and plants. On the basis of the above-mentioned results, three types of climate of organic matter SUC are divided tentatively,i.e.: (1) in middle-low elevation and altitude areas, the higher value of δ13C in lake sediments responds to warmer climate period for C4 plant effect: (2) in high elevation or altitude areas, where C4 plant almost disappears, the higher value of δ13C in lake sediments responds to colder period; (3) in addition, the climatic indication of δ13C in some areas is insensitive because of the influences of such factors as the hydrology of the lake basing the change of sedimeatal environment, the reservation of lake sediments, etc. |
| Key words: Lake sediments organic matter δ13C paleoclimate |
